PIC Microcontroller 16F877A code in CCS compiler
the Thermocouple Chip is Max6675 (qty=3) 3 Buttons
Button1 for Mode selection, Button2 for Up settings, Button3 for down settings, Modes are for setpoints, Alarms, PID tuning, pwm setting. 2x16 character LCD dsiplay, code for wireless transmitter for temp monitor & alarm, Temp in Degrees C or F, Schematic is available.
The code was writen by a coder from RAC and promissed to provide support after we completed the prototype board, he is no where to be found.
The project was for an oven controller with dual chamber control. Damper1, Damper2, Fan, 3 Type K Themocouple (TC)
The Dampers are controlled by stepper motor, Fan controlled by PWM signal, a dual "PID" Proportional Integral Derivative control loop for each chamber,
Chamber1 is controlled with Damper1 & Fan, and TC1
The Fan is for forced air if needed, so fine control the dampers are used for high reaction and large error from setpoint & damper is full open the fan is used.
Chamber2 is controlled with Damper2 only, and TC2
the Third TC3 is for product Temberature monitor, alarms on all TC readings (High & Low set by user)
All settings including set points and alarms for TC1, TC2,TC3 are set by user if power is turned off the settings are maintained,
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CCS compiler, PIC Microcontroller 16F877A, Max 6675, LCD 2x16