Bunny-Shed-Climate-Control

Matching Home Assistant Home Automation Hub Configuration

https://github.com/Genestealer/Home-Assistant-Configuration

Info

Code Header Copy

Richard Huish 2015-2018

Bunny shed heating controller using ESP8266 NodeMCU, 433Mhz transmitter, MQTT and Home Assistant

ESP8266 based with local home-assistant.io GUI, 433Mhz transmitter for heater/fan control and DHT22 temperature-humidity sensor

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Key Libraries:

ESP8266WiFi.h // ESP8266 core for Arduino https://github.com/esp8266/Arduino

PubSubClient.h // Arduino Client for MQTT https://github.com/knolleary/pubsubclient

RCSwitch.h // RF control lib, https://github.com/sui77/rc-switch

DHT.h // DHT Sensor lib, https://github.com/adafruit/DHT-sensor-library

Adafruit_Sensor.h // Have to add for the DHT to work https://github.com/adafruit/Adafruit_Sensor

private.h // Passwords etc not for github

ESP8266mDNS.h // Needed for Over-the-Air ESP8266 programming https://github.com/esp8266/Arduino

WiFiUdp.h // Needed for Over-the-Air ESP8266 programming https://github.com/esp8266/Arduino

ArduinoOTA.h // Needed for Over-the-Air ESP8266 programming https://github.com/esp8266/Arduino

ArduinoJson.h // For sending MQTT JSON messages https://bblanchon.github.io/ArduinoJson/

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The circuit:

NodeMCU Amica (ESP8266)

Inputs:

DHT22 temperature-humidity sensor - GPIO pin 5 (NodeMCU Pin D1)

Outputs:

433Mhz Transmitter - GPIO pin 2 (NodeMCU Pin D4)

LED_NODEMCU - pin 16 (NodeMCU Pin D0)

LED_ESP - GPIO pin 2 (NodeMCU Pin D4) (Shared with 433Mhz TX)

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Notes:

GUI: Locally hosted home assistant https://home-assistant.io

MQTT: Locally hosted broker https://mosquitto.org/

Over the Air Updates (OTA)

NodeMCU LED lights to show MQTT conenction.

ESP LED lights to show WIFI conenction.

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Edits made to the PlatformIO Project Configuration File:

  platform = espressif8266_stage 

esp8266/Arduino#2833 as the standard has an outdated Arduino Core for the ESP8266, ref http://docs.platformio.org/en/latest/platforms/espressif8266.html#over-the-air-ota-update

build_flags = -DMQTT_MAX_PACKET_SIZE=512

Overide max JSON size, until libary is updated to include this option knolleary/pubsubclient#110 (comment)

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Example Bill Of Materials

• NodeMCU Amica (ESP8266)
• DHT22 temperature-humidity sensor
• 433Mhz ASK Transmitter
• Breadboard
• Breadboard jumper wires
• Example remote control sockets