Microcontrollers and code

Code for ESP32 and Arduino: read sensors, drive outputs and talk to other systems.

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Read temperature, humidity and pressure from a BME280 over I2C with an ESP32

Wire the two I2C lines, find the address with an I2C scanner, read values with the Adafruit library, tell a BME280 from a look-alike BMP280, and why it reads too warm.

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