CanAirIO is a citizen science initiative. We are developing a mobile application that is able to set a PM2.5 or CO2 sensors, and other related sensors, as a fixed station using WiFi or mobile station with an smartphone by using a Bluetooth connection.
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Micropython implementation of DFPlayer control using UART 1 (secondary Serial connection)
Micropython I2C-based manipulation of the MCP series GPIO expander, derived from Adafruit_MCP230xx
Micropython library for ST7920 128x64 monochrome LCD. Tested on a 'Cockle'; NodeMCU module w. Micropython 1.8.7