Wiring Diagram and Example code for RPI 4-Channel Relay Shield

yangze2065

I just bought the "Inland RPI 4-Channel Relay 5V Shield for Raspberry Pi/ CE Certification" from Houston branch recently. It is a nice relay board to use on my Pi 3B+ and 4 following the reviewer code from one of the product review. But this HAT occupied all 40-pin without exhausting every GPIO pin. I would like to desolder the 40pin-connector (or jump-wire) and use only vcc, gnd, and actual signal pings to free other GPIOs. I was not able to find any resources for source code or wiring diagrams for the RPi 4-chan relay. Any help?

Lambdaben

I'm not good with wiring, but I kinda help with the coding

Sample Code

#include <wiringPi.h>
int main()
{
  wiringPiSetup();

  pinMode(7,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(22,OUTPUT);
  pinMode(25,OUTPUT);
  printf("relay testing!\n");
  while(1)
  { 
        digitalWrite(7,HIGH);
        delay(500);
        digitalWrite(7,LOW);
        digitalWrite(3,HIGH);
        delay(500);
        digitalWrite(3,LOW);
        digitalWrite(22,HIGH);
	delay(500); 
        digitalWrite(22,LOW);
	digitalWrite(25,HIGH);
	delay(500);
	digitalWrite(25,LOW);
	delay(500); 
  }	
}

Hope this helps!

yangze2065

Thank you! I research around and this product seems like a duplicate of one of the Keyestudio RPi 4-channel relay (part#KS0212).

I kinda see the front print layout matches the wPi 7, 3, 22, 25 (or BCM 4, 22, 6, 26), but it's hard to identify the Vcc and ground pins. Any suggestions? TIA

Lambdaben

Wiring and electrical are not my forte unfortunately, but maybe this can help

Assuming the ground pins should be the same on the locations on the relay board.

Two suggestions:

https://www.microcenter.com/product/632042/52pi-dockerpi-4-channel-relay

This has a passthrough GPIO header

https://www.microcenter.com/product/600412/micro-connectors-raspberry-pi-40-pin-gpio-1-to-2-expansion-board

This converts the GPIO from 1 to 2