Documentation

Overview

This 12V single-channel relay module accepts commands from an included 433 MHz wireless remote — no microcontroller needed. Press a button on the remote, the relay clicks, your AC or DC load switches. Perfect for remote-controlled garage doors, RC fans, lighting projects, and "wireless on/off" projects where you want a physical button you can carry around.

The module supports three switching modes (M / T / L for Momentary / Toggle / Latching), selectable by jumpers. The relay's NC/COM/NO terminals can switch up to 10A at 250VAC or 30VDC, giving plenty of headroom for typical home automation loads. The board's 433 MHz receiver chip has an EEPROM that remembers up to 4 paired remotes — you can train it to recognize new remotes by holding the small onboard learn button.

At a Glance

Specifications

Pinout Diagram

Wiring Guide

Code Examples

This module operates fully standalone — no microcontroller code required. The included remote is the only "interface". The examples below show how to also trigger the module from an Arduino if you want to combine remote and programmatic control on the same load.

Arduino — Send 433 MHz Codes That Imitate the Remote

// Fake the wireless remote from an Arduino + cheap 433 MHz TX module
// Library: rc-switch by sui77

#include <RCSwitch.h>

RCSwitch tx = RCSwitch();

void setup() {
  tx.enableTransmit(10);    // TX module DATA pin
  tx.setProtocol(1);
  tx.setPulseLength(350);
}

void loop() {
  // Replace 1234567 with the code your remote actually sends.
  // To find it: run rc-switch's ReceiveDemo with a separate RX module
  // and press the remote's button.
  tx.send(1234567, 24);
  delay(2000);
}

Arduino — Sniff the Remote's Code

// Use a 433 MHz RX module + Arduino to learn what code the remote sends
// Library: rc-switch by sui77

#include <RCSwitch.h>

RCSwitch rx = RCSwitch();

void setup() {
  Serial.begin(9600);
  rx.enableReceive(0);  // Interrupt 0 = D2 on UNO
}

void loop() {
  if (rx.available()) {
    Serial.print("Code: ");
    Serial.print(rx.getReceivedValue());
    Serial.print("  Bits: ");
    Serial.println(rx.getReceivedBitlength());
    rx.resetAvailable();
  }
}

Raspberry Pi (Python) — Send Codes via Cheap TX Module

#!/usr/bin/env python3
# Install: pip install rpi-rf
# TX module DATA -> GPIO 17 (Pin 11)

from rpi_rf import RFDevice
import time

tx = RFDevice(17)
tx.enable_tx()

# Replace with your remote's actual code (use receive script first)
tx.tx_code(1234567, 1, 350)
time.sleep(1)
tx.cleanup()

Frequently Asked Questions