Arduino jobs

Title: Mechatronics Engineer needed to build custom 6mm Rubber Profile Cutting Machine (Arduino + Nextion UI) Project Description: We are seeking an experienced Mechatronics / Embedded Systems Prototyping Engineer to design, program, assemble, and test a benchtop automated cutting machine for a solid, 6mm rubber profile. The machine must operate standalone via a user-facing touchscreen interface. Required Technical Features: 1. Interface: Nextion 3.5" Discovery Touchscreen (for entering cut length in mm and batch quantity). 2. Controller: Arduino Mega 2560 R3. 3. Feeding System: Dual synchronized polyurethane-coated pinch rollers driven by a NEMA 23 stepper motor to ensure a tension-free feed (preventing material stretching). 4. Cutting Mechanism: A high-speed blade...

...in xLights and program a 1-minute test sequence synced to music. - Test with a dancer, fix failures, and document everything: wiring diagram, settings, photos. Ideal Skills and Experience: - Expertise in electronics, especially with ESP32 - Proficiency in programming for LED effects - Experience with wearable tech and fiber optics - Strong creative input for custom design - Embedded Systems, Arduino, ESP32, Raspberry Pi, Soldering, Circuit Design, IoT, C/C++, Linux, Electronics, Python (optional) - Comfortable soldering, crimping and using a multimeter - Understands basic power concepts: voltage drop, current draw, Li-ion battery safety Please include examples of similar work in your bid....

...for someone who can help me with ESP32 HMI programming. Are you available, or do you know someone who might be interested? we are traying to make a programable inter face wit touch screen capabilities. with drop down menu tabs. home screens to display a background. the idea is to have it just on a picture and be able to swipe to a second menu where it controls relays off and on using an Arduino nano....

I'm seeking an experienced Arduino developer to create a working robotics project for my final course requirement. The robot needs to navigate using obstacle avoidance and display status with LED indicators. Requirements: - Functionality: Obstacle avoidance - Components: Use of ultrasonic sensors - Information display: LED indicators Ideally, you should have: - Expertise in Arduino programming - Experience with ultrasonic sensors - Knowledge in robotics and obstacle avoidance algorithms - Ability to integrate LED indicators for status display Please ensure that the final product is fully functional, not just a theoretical design. everything should come from your SparkFun Inventor's Kit (SIK)

...several momentary push-buttons to submit an answer, and an LED display immediately shows the chosen option (and later, whether it was correct). Everything should live on a breadboard and run from a standard 5 V supply, driven by a readily available Arduino board. Here’s what I need from you: • A clear, annotated schematic and breadboard layout showing the Arduino, the push-buttons, current-limiting resistors, and the LED display (a single 7-segment or a compact multi-digit module—whichever you feel is most efficient). • A thoroughly commented Arduino sketch that: – debounces the buttons, – updates the LED display in under half a second, – lets me set or change the “correct” answer in code, and &nd...

...Audible alert: exactly three beeps at timeout, each about one second apart, loud enough to notice in a small room. • Intuitive buttons or rotary knob to set, start and reset. • Runs on standard batteries (coin cell). Power draw should allow several months of occasional use. Deliverables 1. Schematic, PCB layout (KiCad or Eagle), and complete BOM. 2. Microcontroller firmware source (Arduino-compatible or bare-metal C) with build instructions. 3. Brief user manual plus assembly guide so the unit can be reproduced or handed to a manufacturer. 4. Demonstration video or clear photos proving the prototype counts down and triggers the triple-beep alert. Acceptance criteria • Accurate timing (±1 s over the full hour). • Display remains reada...

need a small IoT device built that can read data from a Selec 500 UCI PID controller through its RS-485 Modbus port and send those values automatically to a Google Sheet via Wi-Fi. The device should: 1. Use an ESP32 board (low-cost, Arduino-compatible). 2. Take input from the RS-485 port of the Selec PID using a MAX485 module. 3. Host a Wi-Fi setup page (so user can enter SSID & password). 4. Send the PID readings (PV, SP, and OP values) every few seconds to a Google Sheet (via a Google Apps Script endpoint). 5. Work on 5V DC or USB power. 6. Be housed in a small project box or DIN rail enclosure for industrial use.

Using 1,8-inch round TFT panels from I need the electronics and software ecosystem that turns them into a re-configurable ...and clock modes. Acceptance criteria • Any number of tiles up to at least 144 auto-map correctly after power-on. • Latency low enough that the clock’s seconds hand or colour transitions remain visually smooth. • Pattern editor responds in real time and matches what appears on the physical grid. • All files build and run using open-source toolchains (KiCad preferred for PCB, PlatformIO/Arduino-CLI or similar for firmware). Manufacture BOM for JLCPCB. With this complete system I can ship Gerbers to , assemble the modules, open a browser and start painting with light on a wall of round displays—no extra coding required.

I am seeking a freelancer to write well-commented template that turns an Adafruit Feather ESP-32 single board computer into a tiny WebSocket server. Later I will expand that template into a mini OCPP (Open Charge Point Protocol) server and add mo...Reliability, maintainability, and application of experience over first time cost. This should not be your first production level ESP32 project. * Decent ability to communicate in English and/or German. What's important * Freelancer is able to describe WHY they chose each library over other competing libraries. * Freelancer will describe which IDE or tools to use for ongoing development (Arduino 2, VSCode/PlatformIO, Expressif IDE, etc) and why. The target language is C++, though you could make an argument for CircuitPython...

Custom 3-PIR GSM Anti-Theft Security Alarm with SMS, Call & Relay PROJECT DESCRIPTION: I am looking for an experienced embedded hardware and firmware developer to design and develop a custom human motion / anti-theft security alarm using an ATmega328P (Arduino-compatible) microcontroller. The device will use 3 external PIR motion sensors connected to the main PCB through long cables. The main feature is a selectable PIR detection threshold of 1, 2, or 3 sensors. This will help reduce false alarms. MAIN PIR LOGIC: The device has: * PIR 1 * PIR 2 * PIR 3 The user can select the required number of PIR sensors that must detect movement. Threshold 1: Any one PIR becomes active = intrusion confirmed. Threshold 2: Any two PIRs become active = intrusion confirmed. PIR1+PIR2, PI...

Custom compact PCB derived from the Arduino Nicla Vision hardware architecture Main MCU: STM32H747 Retain:- GC2145 camera - IMU - Wi-Fi/BLE - external flash/memory required by the original design - USB programming/data - battery charging - battery monitoring/power management Remove:- onboard microphone - onboard VL53L1CB ToF sensor - unnecessary expansion/connectors not required for the final product Add PONO TSD50 LiDAR- UART communication - dedicated power supply - 4 solder pads: VCC / GND / RX / TX Battery:- 1S Li-Po - approximately 350 mAh - battery remains permanently connected One momentary push button for:- system power ON - controlled shutdown/OFF One USB port must support:- battery charging - firmware programming - USB communication Battery must be able to charge even...

...tactile push-button must be replaced/bypassed using an automated transistor circuit switch (e.g., NPN BC547, 2N2222, or a small logic-level MOSFET) connected straight to Digital Pin 2 of the microcontroller. • Output Interface: Two separate 2-Pin JST-XH (2.54mm pitch) header sockets at the board edge to plug in the atomizing discs. Design Shortcut Note: You do not need to design the ATmega328P/Arduino Nano core from scratch. You are highly encouraged to base the foundation layout on open-source, factory-verified reference hardware templates (such as OSHWLab/EasyEDA projects). Your primary custom design layout task involves cleanly integrating the 108KHz dual-mist circuit block and mapping out the transistor switch automation logic. Final Deliverables Required: A complete, v...

...breadboard. This is a very quick micro-task for an experienced electronics engineer. The design is an ultra-low-power Smart Irrigation Sensing Node using an all-3.3V power architecture. Key Specifications & Pin Mapping: • Microcontroller: Arduino Pro Mini (3.3V variant) • Radio Module: LoRa Ra-01 (Antenna area must be kept completely clear of copper traces and ground planes). Pin connections required: NSS to D10, RST to D9, DIO0 to D2, plus standard hardware SPI lines (D11, D12, D13). • Power Input: Direct 3.2V LiFePO4 Battery connection to the Arduino VCC rail (Bypassing the RAW pin. No onboard voltage regulators or complex buck circuits needed). • Edge-Mounted Screw Terminals (e.g., KF301-style) required for all external components: • 1x 2-...

...Automatic Soap Dispenser with Low Soap Level Detection. I am using: - Arduino Nano V3.0 (ATmega328P) - TTP223 capacitive touch sensor - XKC-Y25-V non-contact liquid-level sensor - Kamoer KPHM100-HB peristaltic pump — 12 V, 0.5 A - LED for low-soap indication - Pump driver circuit Operation: When the TTP223 is touched, the Arduino Nano should activate the 12 V peristaltic pump for a programmed amount of time and then stop it. The XKC-Y25-V will be mounted outside the soap container at the low-level point. When the soap becomes low, the Arduino should turn on an LED. The Arduino must not drive the pump directly. Please include a suitable transistor/MOSFET pump-driver circuit and flyback protection. The pump uses 12 V, while the Arduino Nano and ...

...what additional work/features are responsible for the increase. Please include in your proposal: - Your experience with ESP32 and GSM/cellular modules - Previous IoT/wearable projects - PCB design experience - Whether you can provide a physical assembled prototype - Estimated completion time - Total fixed cost - Examples/photos/links of relevant previous work Please do not submit a generic Arduino/IoT project proposal. I am specifically looking for someone capable of developing a custom wearable prototype according to the above requirements....

I'm looking for a skilled speaker designer and maker to help build a Bluetooth speaker primarily for indoor use. I am the designer of the speaker, I am looking to make the design into a workable speaker. Key requirements: - High-fidelity sound quality - Long battery life Ideal skills and experience: - Expertise in acoustics and audio engineering - Experience in arduino, coding and electrical knowledge for speakers - Knowledge of prototyping, battery technology.

# Custom Industrial PLC Hardware & Firmware Development We are looking for an experienced **Embedded Systems / Industrial Electronics Engineer** to design and develop a custom industrial PLC/controller suitable for real industrial environments. The objective is to develop a reliable, professional, manufacturable controller based on a custom PCB, not a hobby-level Arduino or development-board solution. The engineer should have strong experience in industrial electronics, embedded firmware, PCB design, EMC/ESD protection, industrial communications, and microcontroller-based control systems. ## Project Objective Develop a compact industrial PLC/controller capable of handling digital and analog I/O, industrial communications, machine-control logic, and optional IoT connectivity...

...including pump sizing and plumbing schematic, that keeps consumption to a minimum without sacrificing cleaning efficiency. • Modular mounting scheme that lets an installer attach guides, rails or wheels without drilling through panels or voiding manufacturer warranties – easy installation is the top priority for end users. • 3D CAD files, BOM with off-the-shelf components, simple control logic (Arduino, PLC or similar), wiring diagram and assembly instructions ready for a prototype build. • Life-cycle maintenance plan and projected per-clean cost so we can preserve the “low-cost” promise. If you’ve engineered moving equipment for rooftops or automated cleaners before, I’d value design insights, material choices and any test data...

...and a small speaker. During a short face-to-face session (about one to two hours) I want to: • Install and test the Arduino core, LVGL graphics library, and the ES8311 audio driver on the board. • Load a few sample audio files, then demonstrate recording through the codec and playing the captured audio back through the speaker. • Connect the board to a public or user Wi-Fi network and verify reliable internet access. We will meet somewhere around Sheikh Zayed; let me know what location works for you, your earliest available time slot, and the cost for the visit. I can be reached directly on 01228834534 to finalise details. Bring whatever tools you need (laptop with Arduino IDE, USB-to-Serial cable, etc.) and be ready to leave me with a fully working de...

...installed and I want to take it a step further by adding three parallel ways to open it: a keypad PIN, an RFID tag/card, and a biometric fingerprint reader. The main driver is day-to-day convenience for family and frequent visitors—no more fumbling for physical keys—so the solution has to be fast, reliable, and easy to maintain. Here’s the scope in practical terms. I need a compact control module—Arduino, ESP32, or any other microcontroller you feel best fits—wired to the Yale lock’s strike mechanism. It must read all three credentials, decide locally, then trigger the solenoid without noticeable lag. A small OLED or LED feedback indicator and a relay or MOSFET driver for the lock should be part of the circuit. Power will come from the existin...

...interpretation of electronic conceptual designs for practical implementation and building of electrical and electronic circuits. ● Working with the Arduino Board for development of the principal prototype. Building up on the same towards more sophisticated models. ● Programming/Coding for Sensing Circuit to Web-App Communication. ● Overseeing all operations during the manufacturing process of all devices and circuits. Required Skills and Competencies: ● A bachelor's/master’s in electrical/Electronic Engineering. A degree in Robotics/Mechatronics is advantageous. ● Strong preference given to previous experience in programming Microcontrollers- Arduino or Raspberry Pi. ● Basic understanding of any CAD software to design circuit schematics and PCB layouts. ● Experi...

I need a full-stack solution that covers both the electronics and the software behind a 10 m air-pistol / air-rifle training target. Hardware – Design, program and calibrate an Arduino or ESP32-based PCB that detects each pellet impact, timestamps it and sends the raw x/y coordinates wirelessly. – Supply the firmware, pinout diagram and any Gerber or KiCad files so I can reproduce the board locally. Software The data from the target must appear in real time on an app that runs on iOS, Android and Desktop (Windows & macOS). A single codebase (Flutter, React Native, Qt or a framework of your choice) is fine as long as all four platforms are delivered. Core features • Live shot display with 10-ring scoring for both air pistol and air rifle distances &b...

...you judge more stable for continuous streaming) serial link. • Receives every incoming packet from the app, parses the raw HEX string byte-by-byte, and exposes the interpreted values in a simple way (e.g., struct, JSON over serial, or clearly commented variables). • Includes clear in-code comments so I can expand the logic later if I decide to act on those values. I will load the code with Arduino IDE, so please keep the project compatible with that toolchain or provide a straightforward PlatformIO alternative. Along with the .ino/.cpp files, include a quick read-me that lists: 1. The Bluetooth library and profile you used. 2. How to pair the Android phone with the ESP32. 3. Expected HEX frame format with an example interpretation. Acceptance criteria: I flas...

...each bitfield, and instantly publish its own status frames back on the bus. All the original HEX files and CAN command tables are already in hand, together with a CAN tracer that shows traffic live. What is missing is the firmware that ties everything together, integrates those files, and implements reliable monitoring and status reporting over CAN. Deliverables • Fully documented ESP-IDF (or Arduino-ESP32 if you prefer) source code that: – Imports my supplied HEX files / calibration tables. – Decodes incoming CAN frames, translating each to its decimal parameters. – Updates internal variables, then transmits the required status frames. • A concise table mapping every CAN ID and byte offset to its decoded value, so I can cross-check with ...

...দিকের জ্ঞানকে কাজে লাগায়। প্রজেক্টের বিবরণ উদ্দেশ্য: একটি অ্যান্ড্রয়েড ডিভাইস থেকে ওয়্যারলেস বা ব্লুটুথ সংযোগের মাধ্যমে একটি রোবোটিক বাহু নিয়ন্ত্রণ করা। প্রযুক্তি: হার্ডওয়্যার: রোবোটিক বাহু, মোটর, Arduino বা Raspberry Pi-এর মতো মাইক্রোকন্ট্রোলার, এবং সংযোগের জন্য ব্লুটুথ মডিউল। সফটওয়্যার: অ্যান্ড্রয়েড স্টুডিও ব্যবহার করে একটি অ্যান্ড্রয়েড অ্যাপ্লিকেশন তৈরি করা, যা রোবোটিক বাহুর বিভিন্ন মুভমেন্ট (যেমন, ঘোরানো, উপরে-নিচে করা) নিয়ন্ত্রণ করার জন্য কোড লিখবে। প্রক্রিয়া: একটি রোবোটিক বাহুর নকশা তৈরি করুন এবং এটিকে প্রয়োজনীয় মোটর ও সেন্সর দিয়ে তৈরি করুন। মাইক্রোকন্ট্রোলার (যেমন, Arduino) ব্যবহার করে রোবোটিক বাহুর হার্ডওয়্যার তৈরি করুন। অ্যান্ড্রয়েড স্টুডিও ব্যবহার করে একটি অ্যান্ড্রয়েড অ্যাপ তৈরি করুন। এই অ্যাপটি ব্যবহারকারীর ইনপুট গ্রহণ করবে এবং ব্লুটুথ বা ওয়্য...

...apply if you have practical experience with one or more of the following: CAN Bus CAN FD SAE J1939 OBD-II UDS Automotive Ethernet Vehicle diagnostics ECU communication CAN reverse engineering CAN decoding Heavy commercial vehicles/trucks Automotive telematics Fleet management systems Embedded automotive systems SocketCAN CANoe/CANalyzer SavvyCAN PCAN Kvaser Vector CAN tools Arduino/ESP32/Raspberry Pi-based CAN interfaces Python/C/C++ for CAN data processing Ideal Freelancer The ideal candidate should have hands-on experience working directly with vehicle CAN networks, preferably commercial vehicles or trucks. Experience with Indian BS6 trucks or manufacturers operating in the Indian commercial-vehicle market would be a significant advantage. We are looki...

...দিকের জ্ঞানকে কাজে লাগায়। প্রজেক্টের বিবরণ উদ্দেশ্য: একটি অ্যান্ড্রয়েড ডিভাইস থেকে ওয়্যারলেস বা ব্লুটুথ সংযোগের মাধ্যমে একটি রোবোটিক বাহু নিয়ন্ত্রণ করা। প্রযুক্তি: হার্ডওয়্যার: রোবোটিক বাহু, মোটর, Arduino বা Raspberry Pi-এর মতো মাইক্রোকন্ট্রোলার, এবং সংযোগের জন্য ব্লুটুথ মডিউল। সফটওয়্যার: অ্যান্ড্রয়েড স্টুডিও ব্যবহার করে একটি অ্যান্ড্রয়েড অ্যাপ্লিকেশন তৈরি করা, যা রোবোটিক বাহুর বিভিন্ন মুভমেন্ট (যেমন, ঘোরানো, উপরে-নিচে করা) নিয়ন্ত্রণ করার জন্য কোড লিখবে। প্রক্রিয়া: একটি রোবোটিক বাহুর নকশা তৈরি করুন এবং এটিকে প্রয়োজনীয় মোটর ও সেন্সর দিয়ে তৈরি করুন। মাইক্রোকন্ট্রোলার (যেমন, Arduino) ব্যবহার করে রোবোটিক বাহুর হার্ডওয়্যার তৈরি করুন। অ্যান্ড্রয়েড স্টুডিও ব্যবহার করে একটি অ্যান্ড্রয়েড অ্যাপ তৈরি করুন। এই অ্যাপটি ব্যবহারকারীর ইনপুট গ্রহণ করবে এবং ব্লুটুথ বা ওয়্য...

...build/read-me so I can reproduce the unit or hand it to a manufacturer. Acceptance criteria 1. From a fresh battery insertion the clock must wake only long enough to refresh hourly, targeting <1 mAh per update. 2. Display remains crisp and readable from 2 m; no ghosting after 1 week of operation. 3. Wi-Fi credentials can be changed without reflashing. 4. All files compile in PlatformIO/Arduino IDE with no warnings. If you have prior E-Ink or ultra-low-power IoT experience, share one relevant project link or brief summary in your note. I’m ready to move quickly once I see a practical timeline for schematic, PCB, and first prototype....

I need a PCB design expert to adapt the Arduino Due Board onto a 24mm x ~15cm board. Key Requirements: - Retain essential functionalities of the Arduino Due Board (Power Supply, exposed pins to program with an external FT232RL module. All components for filters like capacitors, diodes and others, crystals.) - no ATMEGA16U2 - no USB conectors - expose A7, A9, A11 pins - SD Card Suport conected to SPI, D10=CS pin - MAX 485 connected to a serial pins. - Design on Proteus PCB - Deliver within a month Ideal Skills and Experience: - Expertise in PCB design and layout - Familiarity with Arduino Due components - Experience with compact design solutions Please provide samples of previous work and a timeline for your approach.

...personal research, so clean beam alignment, minimal stray light and basic user safety are essential. If you are local to Denver, CO and vicinity, you will be given preference. LET ME KNOW YOUR LOCATION IN MESSAGE Here is what I’m bringing to the table and what I’m expecting from you: Materials needed, and their purpose: • Programmable microcontroller (e.g., Raspberry Pi Pico, ESP32, or Arduino Nano) to input oscillatory frequencies that control the diodes as a single unit, and a timer to select running time. • Oscillator specs: Each setting will have 4 programmable ‘slots’. These will repeatedly run in sequence for the selected running time.  • USB computer connection and software required to connect the microcontrol...

...and a camera/controller for basic detection and imaging. Motor-operated gates will control the direction and movement of the sheet. This is an early demonstration prototype, not a production-ready commercial product. Simple, inexpensive, off-the-shelf components and 3D-printed parts are preferred. Required capabilities: mechanical/CAD design, paper-feed/roller mechanisms, motors and sensors, Arduino/ESP32/Raspberry Pi or similar embedded control, camera integration, 3D printing/fabrication, assembly, testing and troubleshooting. I do not currently own the components, so the engineer should provide a proposed BOM with component links and prices before anything is purchased. The successful freelancer must be able to physically manufacture, assemble and test the prototype and sh...

I need f...on-screen messages are necessary. Core tasks for you: • Write clean, well-commented code that tracks the current level, performs the doubling logic, and updates persistence so progress survives a power cycle. • Drive the LED output the instant a level completes. • Map the button inputs for starting, advancing, and reset actions. I am open to whichever microcontroller platform you prefer (Arduino, Raspberry Pi Pico, STM32, etc.), provided you include all pin definitions and a quick wiring diagram so I can reproduce the setup. While classic coin sort or counterfeit-detection features could be interesting later, they are outside this initial scope. Deliverables are the full source code, a compiled binary (if applicable), and a brief README explainin...

...multiple sensors. # Project Title **Custom Arduino Due–Based Multi-Sensor Data Acquisition PCB with Integrated LCD Display** ## Project Overview I am looking for an experienced PCB/electronics designer to design a **custom standalone sensor device based on the Arduino Due platform**. The objective is to have all required sensors and supporting electronics integrated onto a single custom PCB. Once the Arduino Due firmware is uploaded, the assembled PCB should function as a standalone device: the sensors should continuously acquire data, the Arduino Due should process the readings, and the measured values/statuses should be displayed on an **LCD permanently mounted on the PCB**. I do not want the final product to depend on an external Arduino...

...System outline • Stage 1 – the node wakes when a vehicle is detected and prepares the sensor stack. • Stage 2 – the traveller places a finger on the scanner; the board must capture, match locally, then encrypt the result. • Stage 3 – the ESP transmits the signed approval to my cloud endpoint; only a positive response prompts the relay that opens the gate. What I need from you 1. Firmware (Arduino IDE or ESP-IDF) that handles sensor drivers, match-on-device logic, and secure HTTPS/MQTT messaging. 2. A concise wiring diagram and BOM showing the fingerprint module, ESP, relay, power regulation, and any level-shifters. 3. A short setup guide so I can flash, enrol prints, and test end-to-end on my bench. Acceptance criteria • First...

Buscamos un especialista en IoT e integraciones hardware/software para trabajar con dispositivos físicos de control de acceso conectados a nuestra plataforma web para gimnasios y clubes. Trabajamos con lectores biométricos y faciales, molinetes, cerraduras, controladoras y equipos de marcas como ZKTeco, Hikvision, Digital Persona, HID, Arduino y otros dispositivos similares. El principal desafío es integrar dispositivos que normalmente están conectados a una PC o red local del gimnasio con nuestra plataforma en la nube, resolviendo: comunicación bidireccional; recepción de eventos en tiempo real; envío de comandos a los dispositivos; sincronización de información; monitoreo del estado de los equipos; recone...

I’m building an IoT device that pairs an Nvidia Jetson AGX with an Arduino board. The core goal is reliable data logging: environmental sensors will feed the Arduino, and the Jetson will aggregate, time-stamp, and store the readings for later analysis. What I need from you • Set up stable serial UART gpio (or I²C/SPI if preferred) communication between the Arduino and the Jetson AGX. • Write Jetson-side code—Python is fine—to pull incoming packets, validate them, and log the data locally (CSV or SQLite). • Provide an Arduino sketch that collects sensor values and transmits them in the agreed format. • Supply a clear wiring diagram plus a short README so I can replicate the build, flash the firmware, and run t...

I need a clean, maintainable way to throttle overall memory usage directly inside the Linux kernel running on a small embedded board. My goal is to guarantee that critical processes never starve for RAM while background tasks are gently reined in before the OOM-killer steps in. The exact board can still change—at the moment I am evaluating Raspberry Pi, Arduino-style MCU boards with Linux, and BeagleBone—but whichever one we settle on, I want a single patch or loadable module that can be ported with minimal tweaks. Upstream code quality matters more than quick hacks. What I am after: a kernel-space mechanism (cgroup tweaks, custom LRU hooks, or another elegant approach you prefer) that detects when overall usage crosses a threshold I define and then slows further alloc...

...from you: • Select or design a compact chassis, drive train, and battery that can run at least 30 minutes on a single charge. • Recommend and integrate the sensing stack—camera, ultrasonic, LiDAR, Bluetooth beacon, or any mix you believe best balances accuracy and cost—for reliable human-following and basic obstacle avoidance indoors. • Write the control firmware / software, preferably in Arduino-compatible C++ or Python (I’m open to your preferred stack if you justify it). • Provide a complete bill of materials, wiring diagram or schematic, cleanly commented source code, and step-by-step assembly instructions. • Demonstrate performance with a short video of the car successfully following a person around an average-sized room, ...

Freelancer Required – SAW Welding Controller Development We are looking for an experienced Embedded Systems / PCB Design Engineer to develop a dedicated controller PCB for an SAW (Submerged Arc Welding) machine. The welding control logic has already been developed and tested on an Arduino development board. We now want to convert the existing prototype into a reliable, compact and industrial-grade controller PCB. Scope of Work * Review existing Arduino code and logic * Convert Arduino-based control logic to a suitable MCU platform such as STM32 * Design complete circuit schematic * Design industrial-grade PCB * 24 VDC industrial input/output * Isolated digital inputs and protected digital outputs * Analog inputs for welding voltage/current feedback * Welding ...

I need a clean, well-commented Arduino sketch for an ESP32 that calls the WeatherAPI service (Indian endpoint) once a day, extracts only the sunset time for my chosen location, and uses that value to energise or de-energise a relay on a GPIO pin at the right moment. Core flow • Connect to Wi-Fi with credentials placed in a separate header or clearly marked section. • Send an HTTP GET to WeatherAPI, using my key and either a city name or lat/long that I can edit easily. • Parse the returned JSON, pick out the “sunset” field, and convert it to a usable 24-hour time. • Compare the current RTC time on the ESP32 to the sunset time and switch the relay accordingly—ideally with a five-minute refresh window so the relay doesn’t chatter. ...

...level drops below a defined threshold, and shut the pump off once the tank is full. I am using a standard overhead tank fed by a single pump from ground level. You’re free to recommend the most reliable sensing method—, or conductive—so long as it performs accurately in typical domestic water conditions and can be serviced easily if something fails. The design must include: • A microcontroller (Arduino, ESP32, or comparable) with clearly commented firmware. • A driver stage capable of switching a 1 HP single-phase pump safely. • Manual override for both pump ON and OFF. • Visual indicators (LED or LCD) showing at least Empty, Half, and Full states. • Basic fault handling—for example, pump timeout if the tank fails to fill...

...accelerometer, confirms the threshold breach, sounds the buzzer for nearby help, fetches latitude and longitude from an attached GPS module and immediately sends an SMS through a GSM or LTE-M modem. If the cellular network is down, the code should queue and retry until a signal is regained. What I need from you is a complete, working proof of concept—schematic, component list, well-commented source code (Arduino, ESP32, STM32 or a platform you recommend), plus a brief guide so I can replicate the setup on my bench and later move it to a custom PCB. Your detailed project proposal should explain the hardware stack you prefer, the crash-detection algorithm you’ll implement, and the best way to minimise false positives during sharp braking or potholes. If you’ve t...

...literature, details design calculations or simulations, and justifies the novelty of the solution. 2. A working prototype or scaled model that physically demonstrates the core concept and produces measurable results I can present during my defense. Please outline your proposed idea, the development tools or simulation platforms you plan to use (e.g., MATLAB/Simulink, Proteus, LabVIEW, Altium, Arduino, Raspberry Pi, PLCs), and a rough timeline showing key milestones from design to testing. I’ll judge success on originality, clarity of documentation, and the prototype’s ability to replicate the claims in the paper....

I need a concise Arduino Uno sketch that drives my Nema 34 stepper through its existing driver in a continuous loop with the following timing: • From home, turn 60° clockwise and hold that position for one second. • Return to the home position and pause one second. • Turn 60° anticlockwise, pause one second, then repeat the entire sequence indefinitely. Please base the calculations on a typical 200-step Nema 34 (1.8° per step) unless I can later change a constant for different micro-stepping settings. No sensors or limit switches are required; it is pure open-loop control. Alongside the .ino file, include a clear wiring diagram that shows the connections between the Arduino Uno, my stepper driver, power supply, and any needed resistors or opt...

...dimensions: Components & Exact Links: 1. Display: 2.4" TFT LCD ST7789 (320x240) SPI module Link: 2. Microcontroller: ESP32 DevKit V1 (30-pin, USB-C version) 3. Mainboard: Double-sided prototype perfboard, exactly 70 mm x 50 mm 4. SD Card Reader: Standard Arduino SPI SD card shield module Link: 5. Rotary Encoder: EC11 Rotary Encoder with push-button (Shaft L=15mm, threaded bushing M7) Link: 6. LED Matrix: 2x2 WS2812B RGB NeoPixel module Link:

I already built the user interface in SquareLine Studio for an Elecrow ...light back off. What I still need is the firmware that ties everything together: • Import the SquareLine-generated LVGL project, read the touch events, and link each of the four on-screen buttons to its relay output. • Drive the relays through ESP32 GPIOs with proper debouncing and visual feedback on the button (e.g. highlighted state while the light is ON). • Provide a clean PlatformIO or Arduino IDE sketch that I can re-compile later, with clear pin definitions so I can relocate the relays if necessary. • A short read-me explaining any required libraries, the build steps, and basic wiring for the three relays. If the code uploads, compiles, and each touch reliably toggles its l...

...Current (Chopper) │ ▼ ┌──────────────────────────────────────────────────────────┐ │ NEMA STEPPER MOTOR (EFFECTOR) │ └──────────────────────────────────────────────────────────┘ 3. Subsystem Requirements for the EngineerA. Microcontroller Unit (MCU)Recommended Hardware: ESP32 or STM32 (F103 series or higher). Avoid legacy Arduino Uno microcontrollers due to insufficient clock speeds for simultaneously handling high-resolution encoder interrupts and generating high-frequency pulse Core Tasks:Quadrature Encoder Decoding: Configure input pins with hardware interrupts on rising/falling edges for Channels A and B. This maintains a precise, absolute global position counter from the original linear optical strip

...robot that can be driven from a smartphone app so students can see core robotics concepts—actuators, basic kinematics, simple autonomy—in action. The emphasis is on clear demonstration rather than complex research, so I want a clean, reliable build that reacts instantly to on-screen controls. You’ll help me from design through to a working prototype. I’m open on the exact board and language (Arduino-Bluetooth, Raspberry Pi-Wi-Fi, ESP32, etc. all fine) as long as the final unit pairs quickly with an Android or iOS app and lets learners steer, change speed, and trigger at least one additional function (for example, a gripper or light). Because the real goal is teaching principles, I also need the code commented clearly and a short walkthrough that I can re...

...Gerber/Drill files, BOM with part numbers, and a brief assembly guide. Firmware scope • Develop firmware that exposes Axidraw-compatible commands over USB—ideally mimicking the original EBB protocol so it works out of the box with Inkscape and existing plotter scripts. • Implement acceleration profiles, homing routines, and pen-up/pen-down sequencing. • Provide source code (PlatformIO / Arduino-ESP32 or ESP-IDF), well-commented, with build instructions. • Include a simple desktop test utility or example Python script that sends a demo plot to verify operation. Acceptance The board should drive two NEMA-17 steppers and a micro-servo smoothly, execute an SVG test file without missed steps, and enumerate as a USB device on Windows, macOS, and Li...

I already have the enclosure and matching lid modeled as two STEP files; no geometry changes are needed. What I do need is a complete, ready-to-print Creality K2 project (slicer profile and/or G-code) that delivers reliable results on the first run. The enclosure will house an Arduino Uno and could end up in a barn, so settings that balance strength with a bit of moisture and temperature tolerance are important. If you think one material—PLA, ABS or PETG—will outperform the others for this application, include that recommendation and tune the profile around it. Scope of work • Import both STEP files and orient them for optimal layer adhesion and dimensional accuracy. • Dial in parameters such as layer height, wall thickness, infill, supports, cooling, tem...