Happy Easter!
Raspberry pi relay module wiring
How is the right way to wire the relay module?
The Raspberry pi GPIO operates with 3,3V,
but the relay needs 5V to operate.
=> Open JD-VCC/VCC Jumper to isolate the two circuits
In addition no resistors are necessary.
They are already build in the relay module.
4 Channel 5V optical isolated relay module with Raspberry pi
a) Using external 5V power supply
- open JD-VCC/VCC Jumper
- connect external 5V to JD-VCC pin of Jumper
- connect GND with ground of external power supply
- connect Raspberry 3,3V to VCC pin of Jumper
- connect In1 with Raspberry GPIO-PIN of your choice
(no extra resistor necessary for GPIO → already on relay board)*
b) Using Raspberry as power supply
- open JD-VCC/VCC Jumper
- connect Raspberry 5V to JD-VCC pin of Jumper
- connect GND with ground of Raspberry
- connect Raspberry 3,3V to VCC pin of Jumper
- connect In1 with Raspberry GPIO-PIN of your choice
(no extra resistor necessary for GPIO → already on relay board)*
*Current flows from 3.3V, delivered by the Raspberry through an on board mounted resistor to the diode of the optical couppler and afterwards into the GPIO-PIN of the Raspberry when the GPIO-PIN is set to LOW.
At this side of the circuit no extra ground needed!
