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Homie Room Sensor

located in IKEAs Vindriktning

after this upgrade it will measure:

  • air quality
  • temperature
  • pressure
  • altitude

The system can be powered by USB-C or Micro-USB, attached at ESP8266 board.

Filesystem

Configuration

Use the config-example.json from the host folder and create here a config.json file.

HowTo upload

Start Platform.io Open a new Atom-Terminal and generate the filesystem with the following command : pio run -t buildfs Upload this new generated filesystem with: pio run -t uploadfs

Command pio

Can be found at ~/.platformio/penv/bin/pio

Hardware

Core

ESP8266 version ESP12 was used.

The prototype was based on the Witty board

REST         |       TXD
ADC    LDR   |       RXD
CH_PD        |       GPIO05
GPIO16       | BTN   GPIO04
GPIO14       |       GPIO00
GPIO12 RGB-G |       GPIO02
GPIO13 RGB-B | RGB-R GPIO15
VCC          |       GND
            USB

The following pins are used:

  • GPIO4 PM1006 particle sensor PIN REST on Vindriktning board
  • GPIO2 WS2812 stripe out of three LEDs, replacing the original LEDs at front
  • GPIO15 Red LED (optional)
  • GPIO12 Green LED (optional) Used as 3.3V Supply for the I2C sensor
  • GPIO13 Blue LED (optional)
  • GPIO13 VCC of I2C (3.3 V)
  • GPIO14 I2C clock
  • GPIO5 I2C data pin
  • RXD Victron MPPT

Victron

An ADUM 1201 should be used for galvanic isolation. The following wiring will be setup:

Ve.Direct  | Purpose | connect | ADUM1201 #2 | ADUM1201 #1 | connect |  ESP8266
1          |  GND    |   <->   | GND2        | GND1        |   <->   |  GND 
2          |  RX     |   <->   | VOB         | VIB         |         |  
3          |  TX     |   <->   | VIA         | VOA         |   <->   |  RX
4          |  5V     |   <->   | VDD2        | VDD1        |   <->   |  3V3

Bill of materials

Core

  • IKEA Vindriktning
  • ESP8266 (e.g. Witty board)
  • BMP280 sensor
  • some wire

Victron

  • ADUM 1201

Sources

For the Witty board