I built a solar water heater controller 25 (?) years ago and being cheap and lazy I used diodes for temp sensors to make a differential thermostat. The sensitivity is low, so I just used 5 in series.

The block diagram of this simple project is shown in Fig. 1 and its circuit diagram is in Fig. 2. The project is built around water temperature sensor probe DS18B20, a 4-digit multiplex 7-segment ...

The Arduino code utilizes the following elements and components: DHT22 Humidity and Temperature Sensor: Used to measure the humidity and temperature of the environment. Bluetooth Module (HC-05): Used ...

This project started as an experiment to see if a water level sensor (with fixed intervals) could be built, using the Arduino ADCTouch library and capacitive sensors. Capacitive sensors have the ...

Emergence of Controlled Environment Agriculture (CEA) ranging from computer controlled water irrigation system to lightning and ventilation has changed the conventional scenario of farming. This paper ...