Building a portable CO2 sensor with data logging, Apple Siri/HomeKit integration, and an iOS/macOS app.
Category Archives: Sensors
Sending data over LTE
Sending air quality sensor data over a mobile LTE network with a Blues Notecard.
Storing sensor data
Choosing a timeseries database to store lots of air quality sensor data.
Enviro+ air quality sensors
Pimoroni Enviro+ air quality sensors exporting their data to Prometheus and graphed by Grafana.
Air quality sensor network
Learning from the previous air quality sensors we built, I’m keen to provide some time to plan and deploy a prototype of some new hardware, and here’s where I need your help to fund the initial build.
Water Quality iOS app
LoRa is great when there’s a network available, but for in-person water quality readings I thought it’d be convenient to add Bluetooth. I had a spare BLE Nano v2 sitting around, so decided to wire that in. It acts as a relay, broadcasting everything that the Water Quality sensor outputs over serial, and pushing it …
Debugging LoRa connectivity
After successfully upgrading the firmware of my Uno’s RN2903 LoRa chip, I was still having trouble connecting to The Things Network and seeing a lot of these lines in the serial monitor: I’d tried five different locations across two states, so was getting pretty paranoid that it was either something I’d done in my Arduino …
Atlas Conductivity K 1.0 to TTN Uno
Now that I know the sensor works with a standard Arduino Mega, it’s time to try and get it running on The Things Uno. My first attempts getting the Atlas Scientific Uno code running on The Things Uno didn’t get very far. It seemed to be a problem running SoftwareSerial on the default pins 2 …
Atlas K 1.0 water conductivity sensor
Connecting an Atlas Scientific Conductivity K 1.0 sensor to an Arduino. First of all, let me just say that I adore the packaging of the EZO conductivity and power isolation circuit boards. They were a lot smaller than I expected, which is a nice surprise, as it’ll mean a smaller end product once I’ve packaged …
Connecting to The Things Network
Out of the box The Things Uno has all the code on it to get started. All I needed to do was plug it into my laptop and open a serial monitor in the Arduino IDE at 9600 baud. Green lights flashed, and its status printed to the console. Happy days. I followed the Uno …