ios-ble-co2-sensor

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ios-ble-co2-sensor

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An iOS/macOS app to read Sensirion SCD-41 CO2 sensor readings written in SwiftUI.

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# A Bluetooth CO2 monitor app for iOS/macOS

An iOS/macOS app to read Sensirion SCD-41 CO2 sensor readings written in SwiftUI.

## Hardware

* [ESP32-C3](https://core-electronics.com.au/adafruit-qt-py-esp32-c3-wifi-dev-board-with-stemma-qt.html)
* [Lipo charger](https://core-electronics.com.au/adafruit-liion-or-lipoly-charger-bff-add-on-for-qt-py.html)
* [SCD-41](https://core-electronics.com.au/adafruit-scd-41-ndir-co2-temperature-and-humidity-sensor-stemma-qt-qwiic.html)
* [Qwiic cable](https://core-electronics.com.au/flexible-qwiic-cable-50mm.html)
* [JST 2-pin cable](https://core-electronics.com.au/jst-2-pin-cable.html)
* Nokia BP-6MT 3.7V battery

### Assembly

* (optional) Solder the Lipo charger to the ESP32-C3
* (optional) Connect the battery to the Lipo charger via the JST 2-pin cable
* Connect the SCD-41 to the ESP32-C3 via the Qwicc cable
* Plug the ESP32-C3 into your laptop and upload the Arduino sketch here: [co2_sensor_scd4x_esp32_http_server](https://github.com/sighmon/co2_sensor_scd4x_esp32_http_server/tree/add/4-adafruit-qt-py-esp32-c3#http-response)

## Software

* [Arduino ESP32-C3 BLE and HTTP exporter](https://github.com/sighmon/co2_sensor_scd4x_esp32_http_server/tree/add/4-adafruit-qt-py-esp32-c3)
* Clone this repo, open in Xcode, tap run
* The app will auto-detect the CO2 sensor and show live data
* Tap the `Save` button to save the current reading shown
* Tap the `History` button to show the readings since the sensor was turned on
* Tap the `Sound` button to play two notes when a sensor reading happens - it first plays middle C corresponding to 1,000 ppm CO2, and then a second note corresponding to the current sensor reading
* Tap the `Archive` button to see a list of readings saved to Core Data

## Data

By pressing the `Save` button, the current reading is saved to your device's Core Data. If you have iCloud setup, the data will sync across your devices.

If you'd like to export your data to a cloud InfluxDB account:

* Sign up for an InfluxDB account: https://cloud2.influxdata.com/signup
* Copy your `OrganisationID`, `BucketID`, and generate an `APIKey`
* Tap the `i` button on the home screen of the app and fill in your details

Here's some sample data in a dashboard in InfluxDB:

## TODO

- [x] Download historic data
- [x] Read realtime data
- [x] Add location data to saved sensor readings
- [x] Add ability to run on macOS
- [x] Save settings to user defaults
- [x] Export to InfluxDB
- [ ] Add [iOS 16 Chart](https://developer.apple.com/documentation/charts) for last 10 readings ([tutorial](https://www.appcoda.com/swiftui-line-charts/))
- [ ] Add [macOS menu item](https://sarunw.com/posts/swiftui-menu-bar-app/)

ios-ble-co2-sensor

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