We support 2 boards “M5 ATOM S3 LCD” and “Lite version”. Both follow the diagram on the right, and support pressure + temperature sensors, and CO2-blops sensors either by vibration or sound.
The main chip we propose and mainly support is the M5 ATOM S3 LCD, as it has inbuild gyroscope and hence can detect the vibration of the airlock directly. It is a very nice small device with LCD and connector port for adding other sensors (temperature and pressure sensors).
M5 ATOM S3 “Lite” version
The “Lite” version is cheaper (half price) but do not hold either MPU6886 gyroscope sensor, and hence, cannot be used for vibration detection of CO2 -blops. Nor do it hold a a LCD. Hence, it is best suited for SPINDELMATE users, but if you should like use CO2-blops detection you can add a sound sensor.
Using a sound sensor?
Both Lite and LCD version also support the use of 3-pin LM393 Sound sensor.
Building the sound sensor is easy, and you just need to add a bit of tape to steady the microphone. Secondly, add a balloon as moisture protection. If you wish to make it very durable you can add some heat-warping for cables (14-16mm radious). I have also added some tin foil to remove any interference, but not sure this really needed.
The LM393 sensor fits nicely in a S-airlock, and should be pressed whole way down. It should still allowe the pressure to get out, but else make a somehow tight “seal”.
The sensitivity of the sound sensor can be adjusted by the small potentiometer on the sensor. In general turn the potentiometer all the way down till no light at all, and then just turn it up until it just lights up when a bubble is hence detected.