1-Channel Relay Module

The 1-channel relay module switches loads up to 30 V via a digital output of a microcontroller such as Arduino, and with a level converter also from ESP32 or Raspberry Pi. Supply and control line are connected via screw terminals, and so is the load. A jumper switches the control between LOW and HIGH.

Important: For safety reasons, the module is only intended for voltages up to 30 V and not for mains voltage. The marking 10A 250VAC applies to the relay, not to the module. The module is therefore not suitable for switching the mains supply of devices such as a 3D printer.

Recommended Accessories:

Features:

Relay with 3 contacts (changeover)
Optocoupler on the control side
Jumper for LOW or HIGH control
Screw terminals for supply, control and load
LED for supply and status

Application Examples:

Switching 12 V solenoid valves, for example for irrigation
Switching pumps, fans and LED strips with extra-low voltage on and off

Connection to 5 V Logic (for example Arduino UNO):

DC+ to 5V
DC- to GND
IN to a digital output, for example pin 8
Jumper on LOW: output LOW switches the relay. Jumper on HIGH: output HIGH switches the relay. Check the switching level before use: the relay LED lights up when the relay is switched
Load to the three relay terminals (changeover)

Connection to 3.3 V Logic (for example ESP32, Raspberry Pi):

The GPIO pins do not tolerate 5 V. Therefore do not connect IN directly, but route it through a logic level converter
DC+ to 5 V (Raspberry Pi: pin 2): the relay needs 5 V here as well
DC- to GND (Raspberry Pi: pin 6)
Connect GND of the module, the level converter and the microcontroller