Review on ⚡️ 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM - JBtek 4 Channel by Jacob Guerrero

This is a durable plate that is easy to use. It can be powered by a 3.3V or 5V Arduino and probably most other controllers. (The 3.3V setting is different from the 5V setting). I used this board with a vape cartridge and high capacity batteries to create a steampunk hat that releases "steam". Easy setup (with Arduino UNO): Connect VCC to a 5V power supply. Connect GND to ground of the controller. Connect IN1-4 to the controller's DIO pins. Leave the JD-VCC jumper on VCC. Connect your common wire to the center pin of the relay and your power line to the left pin for normally open (off) and the right pin for normally closed (on). Program the controller to record digitally (contact, LOW) when you want the relays to switch. Pros: Simple design. Relays 10A are suitable for most requirements. Compactness. Disadvantages: none.