
Building a portable ambient conditions sensor
This post describes how I put together a bluetooth connected ambient conditions sensor using a microcontroller and CircuitPython. Although this device can be used to monitor ambient conditions anywhere, I built it with a specific purpose in mind: monitoring temperature and humidity inside plastic containers storing 3D printer filament spools. Some 3D printer filaments are very susceptible to high humidity conditions (e.g. ABS) and can quickly degrade. Manufacturers recommend to keep them in areas with humidity conditions below 50% and ambient temperature not exceeding 30 Celsius....