Arduino MQTT RF Transmitter

This Arduino project utilizes an ESP8266 module to connect to Wi-Fi and an MQTT broker, allowing you to transmit data wirelessly using an RCSwitch transmitter.

For example this can be used whenever a button is pressed from another device, we can automate lights or doorbells over 433mhz.

Prerequisites

To run this project, you will need the following:

• Arduino board and 433mhz transmitter
• Wi-Fi network with credentials (SSID and password)
• MQTT broker server with configuration details (server address, port, user, and password)

Wiring Diagram

NodeMCU	433MHz Transmitter
D2	Data Pin
3.3v	VCC
GND	GND

Installation

1. Clone or download this repository.

2. Open the Arduino IDE and install the following libraries:

   • ESP8266WiFi
   • PubSubClient
   • RCSwitch

3. Connect your Arduino board with the ESP8266 module to your computer.

4. Open the Arduino sketch file (arduino_mqtt_rf_transmitter.ino) in the Arduino IDE.

5. Modify the following variables in the sketch to match your Wi-Fi and MQTT settings:

   • ssid: Your Wi-Fi network SSID
   • password: Your Wi-Fi network password
   • mqttServer: Your MQTT broker server address
   • mqttPort: MQTT broker port (usually 1883)
   • mqttUser: MQTT username (if applicable)
   • mqttPassword: MQTT password (if applicable)
   • mqttTopic: MQTT topic to subscribe and transmit on
   • transmitterPin: The pin connected to the RF transmitter (D2 by default)
   • transmitterProtocol: Protocol used by the RF transmitter
   • transmitterPulseLength: Pulse length for the RF transmitter
   • transmissionData: Data to be transmitted wirelessly
   • transmissionLength: Length of the transmission data

6. Upload the sketch to your Arduino board.

7. Open the Serial Monitor to view the debug output and verify the Wi-Fi and MQTT connections.

8. Once connected, sending an MQTT message to the subscribed topic (mqttTopic) will trigger the transmission of data using the RCSwitch transmitter.

License

This project is licensed under the MIT License.