Arduino Soil Moisture Sensor Circuit – Connection Diagram Now that we have a complete understanding of how a Soil Moisture sensor works, we can connect all the required wires to the Arduino UNO board.

Required Components for PIR Motion Sensor Light PIR Motion sensor Transistor BC547 (NPN) Relay module 12V Led strip Resistor 10k 12V DC socket Connecting wires 12V DC Adaptor / Battery PIR Motion ...

Here is the basic circuit diagram of the UV Sensor Module, drawn & checked by me (thanks to my USB microscope and LCR meter).In the circuit PD1 is the GUVA-S12SD, and U1 is the SGM8521. The only one ...