homekit-scd30

HomeKit SCD-30 CO2 sensor

An Apple HomeKit accessory for the Adafruit SCD-30 CO2 sensor.

Hardware

• Adafruit SCD-30 CO2 sensor (Core Electronics)
• Raspberry Pi (3, 4, zero)

Wiring

Adafruit have a great tutorial: Learn SCD-30

Software

• Install Go >= 1.14 (useful Gist for Raspberry Pi)
• Build: go build homekit-scd30.go
• Run: go run homekit-scd30.go
• In iOS Home app, click Add Accessory -> "More options..." and you should see "SCD-30"

Prometheus exporter

To export the co2, temperature, and humidity for Prometheus use the optional flag -prometheusExporter.

• Run: go run homekit-scd30.go -prometheusExporter

You'll then see the data on port 8000: http://localhost:8000/metrics

# HELP co2 CO2 measured (ppm)
# TYPE co2 gauge
co2 513.689697265625

# HELP temperature Temperature measured (°C)
# TYPE temperature gauge
temperature 16.708629608154297

# HELP humidity Relative humidity measured (%)
# TYPE humidity gauge
humidity 66.6168212890625

TODO

• Read the sensor
• Add HomeKit CO2, temperature, humidity accessory
• Add Prometheus exporter
• Add Pull Request for sending a forced calibration reference, and maybe altitude calibration