The hardware is consists of an Arduino microcontroller (here an Arduino Uno R3) and a pre-wired soil moisture sensor module. The soil moisture sensor module , built around the LM393 comparator, gives ...

As found in the schematic of the generic PIR motion detector module, one pin of the LDR goes to ground ... The code is an Arduino project for the Digispark Attiny85 to turn on a light source when the ...

[Gord Payne] has one with an elegant sensor ... reaching the LDR from the LED decreases as the pipe is bent, and with a simple divider circuit a voltage can be read by an Arduino.