first the ultrasonic will detect the water level, if satisfied then start an internal timer and turn on the second relay for 5 minutes. Next, the proximity sensor will detect the distance of the fluid and control the third relay. Lastly, a tds sensor will tell whether to open the fourth relay or open the first relay whereby activate the ultrasonic sensor again
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I have more than 9 years experience in embedded hardware design and firmware development . And i have completed many products based on IOT based . So I can do your job within a time limit with your satisfaction.