A customer wanted to create a proof-of-concept of a cellular IoT connected sound pressure level sensor (decibel meter). Besides sending the values to the cloud over LTE-M/NB-IoT there also needed to be an OLED screen to read the values locally.

With our certified, open source Walter module, an OLED module and the PCB Artists sound level sensor module, this was built in less than an hour. The full code can be found on github: https://github.com/daanpape/walter_sp...

Want to experiment with cellular IoT yourself, take a look on our website: https://www.quickspot.io/