Building a Serial Gateway

created by hek , updated

The Serial gateway is pretty simple to build. You will do exactly the same radio connection maneuver when building your sensors. If you are a proud Vera owner you should use an Arduino Nano for the Serial Gateway.



Wiring Things Up

Just follow the instructions in connecting the radio module.

Upload the Serial/USB Gateway Sketch

Finally, compile and upload the gateway sketch using the Arduino IDE on your computer.

SerialGateway Example

This is a fully working example sketch called 'SerialGateway.ino'.

 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 * Created by Henrik Ekblad <[email protected]>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list:
 * Documentation:
 * Support Forum:
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 * The ArduinoGateway prints data received from sensors on the serial link.
 * The gateway accepts input on seral which will be sent out on radio network.
 * The GW code is designed for Arduino Nano 328p / 16MHz
 * Wire connections (OPTIONAL):
 * - Inclusion button should be connected between digital pin 3 and GND
 * - RX/TX/ERR leds need to be connected between +5V (anode) and digital pin 6/5/4 with resistor 270-330R in a series
 * - To use the feature, uncomment any of the MY_DEFAULT_xx_LED_PINs
 * - RX (green) - blink fast on radio message recieved. In inclusion mode will blink fast only on presentation recieved
 * - TX (yellow) - blink fast on radio message transmitted. In inclusion mode will blink slowly
 * - ERR (red) - fast blink on error during transmission error or recieve crc error

// Enable debug prints to serial monitor
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69

// Set LOW transmit power level as default, if you have an amplified NRF-module and
// power your radio separately with a good regulator you can turn up PA level.
#define MY_RF24_PA_LEVEL RF24_PA_LOW

// Enable serial gateway

// Define a lower baud rate for Arduino's running on 8 MHz (Arduino Pro Mini 3.3V & SenseBender)
#if F_CPU == 8000000L
#define MY_BAUD_RATE 38400

// Enable inclusion mode
// Enable Inclusion mode button on gateway

// Inverses behavior of inclusion button (if using external pullup)

// Set inclusion mode duration (in seconds)
// Digital pin used for inclusion mode button

// Set blinking period

// Inverses the behavior of leds

// Flash leds on rx/tx/err
// Uncomment to override default HW configurations
//#define MY_DEFAULT_ERR_LED_PIN 4  // Error led pin
//#define MY_DEFAULT_RX_LED_PIN  6  // Receive led pin
//#define MY_DEFAULT_TX_LED_PIN  5  // the PCB, on board LED

#include <MySensors.h>

void setup() {
  // Setup locally attached sensors

void presentation() {
 // Present locally attached sensors

void loop() {
  // Send locally attached sensor data here

See Advanced build options for more about inclusion button and leds.

Shopping Guide

10pcs NRF24L01+ 2.4GHz Wireless Transceiver
This is what enables your sensors to communicate wirelessly across a nominal range of 60 meters.
1752 available - $9.99   Buy
In stock - $7.75   Buy
Arduino Nano Compatible
This puppy has both 3.3V and 5V outputs that makes it flexible to use without the need for regulators to power the attached radio and/or sensors. In includes an onboard FTDI USB recognized by the Vera so it is perfect to use as Vera Gateway
3997 available - $7.75   Buy
In stock - $6.14   Buy