Overview

The rf433 node provides simple 433MHz RF transmitter and receiver functionality for wireless control and automation. These inexpensive modules use on-off keying (OOK) modulation and are commonly used with remote-controlled power outlets, wireless doorbells, weather stations, and basic security sensors.

433MHz

Operating Frequency

100m

Typical Range

OOK

Modulation Type

Protocol Types

Properties

Property	Type	Required	Default	Description
txPin	number	No	17	GPIO pin for RF transmitter data line
rxPin	number	No	27	GPIO pin for RF receiver data line
protocol	select	No	"1"	RF protocol type: "1", "2", "3", "4", "5"
pulseLength	number	No	350	Pulse length in microseconds
repeatTransmit	number	No	10	Number of times to repeat transmission for reliability

Inputs

Transmit Code

{
  "payload": {
    "code": 5393,
    "protocol": 1,
    "pulseLength": 350,
    "bitLength": 24
  }
}

Simple Code Transmit

{
  "payload": 5393
}

Outputs

Received RF Code

{
  "payload": {
    "code": 5393,
    "protocol": 1,
    "pulseLength": 350,
    "bitLength": 24,
    "binary": "000000000001010100010001"
  },
  "timestamp": "2025-01-15T10:30:00.000Z"
}

TX Confirmation

{
  "payload": true,
  "code": 5393,
  "repeats": 10,
  "topic": "rf433/tx/done"
}

Wiring Diagram

TX and RX Modules to Raspberry Pi

  433MHz TX Module       Raspberry Pi
  +------------+        +--------------+
  | VCC        |--------| 5V    (Pin 2)|
  | DATA       |--------| GPIO17(Pin 11)|
  | GND        |--------| GND   (Pin 6)|
  +------------+        |              |
                        |              |
  433MHz RX Module      |              |
  +------------+        |              |
  | VCC        |--------| 5V    (Pin 4)|
  | DATA       |--------| GPIO27(Pin 13)|
  | GND        |--------| GND   (Pin 9)|
  +------------+        +--------------+

Wiring Notes

VCC can be 3.3V-12V for TX (5V recommended for better range)

DATA (TX) connect to any available GPIO pin

DATA (RX) connect to any available GPIO pin

Antenna solder 17.3cm wire to antenna pad for best range

Tip: A simple 17.3cm straight wire antenna on both TX and RX dramatically improves range from a few meters to 100m+.

Example Use Cases

Smart Power Outlet Control

Control 433MHz wireless power outlets from the dashboard with on/off buttons.

button (on/off) → change → rf433 (tx)

[
  {
    "id": "on-btn",
    "type": "button",
    "label": "Outlet ON"
  },
  {
    "id": "set-on-code",
    "type": "change",
    "rules": [
      { "t": "set", "p": "payload", "to": 5393 }
    ]
  },
  {
    "id": "rf-tx",
    "type": "rf433",
    "txPin": 17,
    "protocol": 1,
    "pulseLength": 350,
    "repeatTransmit": 10
  }
]

Doorbell Notification System

Capture 433MHz wireless doorbell presses and send Telegram notifications.

rf433 (rx) → filter (code) → telegram

[
  {
    "id": "rf-rx",
    "type": "rf433",
    "rxPin": 27
  },
  {
    "id": "doorbell-filter",
    "type": "switch",
    "property": "payload.code",
    "rules": [
      { "t": "eq", "v": "12345" }
    ]
  },
  {
    "id": "telegram-notify",
    "type": "telegram",
    "chatId": "-100123456",
    "message": "Doorbell rang!"
  }
]

Common Use Cases

Wireless Power Outlets

Control 433MHz remote-controlled sockets and plugs

Security Sensors

Capture signals from wireless door/window sensors

Doorbell Integration

Intercept and automate wireless doorbell signals

Weather Station Bridge

Receive data from 433MHz weather sensors and stations

Related Nodes

nrf24l01

2.4GHz bidirectional radio transceiver

lora_sx1276

Long-range LoRa transceiver

gpio-out

Direct GPIO digital output control