90 lines
3.4 KiB
Markdown
90 lines
3.4 KiB
Markdown
# ESPHome VINDRIKTNING Particle Sensor
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The IKEA VINDRIKTNING particle sensor is [simple and cheap](https://www.ikea.com/au/en/p/vindriktning-air-quality-sensor-50498243/), costing only $15 AUD. It's easy to attach an ESP device to three test points on the device's PCB to read the communication between the sensor and the IC on the board.
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This project takes the excellent work of Sören Beye in the [Hypfer/esp8266-vindriktning-particle-sensor](https://github.com/Hypfer/esp8266-vindriktning-particle-sensor) project and incorporates it into a custom ESPHome component that can be used as an [External ESPHome component](https://esphome.io/components/external_components.html).
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| Device in Home Assistant | PM 2.5 over time |
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| --- | --- |
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## Rationale
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Most of the boilerplate code and configuration of the original project can be abstracted away by ESPHome. Things like Wifi configuration, OTA updates, Home Assistant auto discovery and integration and UART setup can be configured with a YAML file.
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The original project contains a moving average value for the sensor, this can be replicated with a [sliding_window_moving_average](https://esphome.io/components/sensor/index.html#sliding-window-moving-average) filter on the sensor.
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## Prerequisites
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To attach your ESP8266 to your sensor, follow the excellent build instructions contained within the [original README](https://github.com/Hypfer/esp8266-vindriktning-particle-sensor#readme).
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## Example YAML
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```yaml
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esphome:
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name: vindriktning-pm-1
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platform: ESP8266
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board: d1
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external_components:
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- source: github://jessedc/esphome-vindriktning-particle-sensor@main
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components: [ vindriktning ]
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refresh: 0s
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logger:
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api:
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ota:
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password: !secret ota_password
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wifi:
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ssid: !secret wifi_ssid
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password: !secret wifi_password
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uart:
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id: uart_bus
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rx_pin: GPIO4
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tx_pin: GPIO5 # Unused
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baud_rate: 9600
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sensor:
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- platform: vindriktning
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id: uart_vindrikning_pm25
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name: PM 2.5μm
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filters:
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- sliding_window_moving_average:
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window_size: 5
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send_every: 5
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```
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## Example Log
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```
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[22:07:10][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:12][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:33][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:34][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:36][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:36][D][sensor:125]: 'PM 2.5μm': Sending state 15.00000 µg/m³ with 0 decimals of accuracy
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[22:07:38][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:41][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:43][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:07:45][D][vindriktning:031]: Received PM 2.5 reading: 15
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[22:08:06][D][vindriktning:031]: Received PM 2.5 reading: 17
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[22:08:06][D][sensor:125]: 'PM 2.5μm': Sending state 15.40000 µg/m³ with 0 decimals of accuracy
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```
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## Build Photos
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I followed the [instructions](https://github.com/Hypfer/esp8266-vindriktning-particle-sensor#readme) to build my own ESP8266 powered Vindriktning sensor, wiring up Gnd, 5V and the single data pin then stuffing it all back into the enclosure.
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| PCB with wires | Wemos D1 Mini attached |
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| --- | --- |
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