If you are designing your own intelligent “Graden Computer” with an optional digital plant moisture sensor/water pump controller that lights an LED to alert the user when it is time to water a potted ...

I made this project because I wanted a way to automatically control the speed of a DC fan according to the temperature read by a LM35 sensor ... area of the Arduino sketch. In the next project I will ...

Thermistors are another example of such sensors whose resistance changes when the operating temperature changes ... can see from that sketch and the circuit diagram, the LED is connected to the ...