Basic WiFi/MQTT sensor node

Tip

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Introduction 

A beehive monitoring sensor node based on the Adafruit Feather HUZZAH, featuring an ESP8266 MCU. Telemetry data is transmitted using WiFi/MQTT. The most recent firmware version is available at node-wifi-mqtt.ino.

Platform and supported peripherals

Adafruit Feather HUZZAH with an ESP8266 MCU
HX711 ADC weigh scale breakout board
DS18B20 digital thermometer
DHT33 (RHT04) digital humidity/temperature sensor

Details 

Wiring

These Fritzing schematics describe the breadboard hardware wiring of the ESP8266 MCU with its sensor equipment (HX711, DS18B20 and DHT33).

ESP8266 with HX711, DS18B20 and DHT33 on breadboard, top view. — Top view

ESP8266 with HX711, DS18B20 and DHT33 on breadboard, bottom view. — Bottom view

Firmware 

Clone git repository

# Get hold of the source code repository including all dependencies
git clone https://github.com/hiveeyes/arduino

# Select this firmware
cd node-wifi-mqtt

Configure

Have a look at the source code node-wifi-mqtt.ino and adapt setting variables according to your environment.

Configure WiFi and MQTT settings:

// WiFi parameters
#define WLAN_SSID       "change-to-your-ssid"
#define WLAN_PASS       "change-to-your-pw"

// MQTT server
#define MQTT_BROKER     "swarm.hiveeyes.org"
#define MQTT_PORT       1883
#define AIO_USERNAME    ""
#define AIO_KEY         ""

Build

The build system is based on PlatformIO.

Build firmware:

make

Upload to MCU

export MCU_PORT=/dev/ttyUSB0
make upload