BME280

This AX22-sized board plants Bosch’s BME280 on a 22 × 22 mm PCB with a small cut-out milled right around the sensor can so ambient air flows freely and self-heating stays microscopic. You get calibrated digital readings of temperature, barometric pressure, and relative humidity over I²C or SPI with a single library call. A 3 V LDO plus bidirectional level shifters let any 1.8 V, 3.3 V, or 5 V microcontroller talk to it safely, and an onboard RC filter keeps the supply rail quiet for rock-steady measurements. Snap it into any AX22 backplane to add weather-station precision, altitude calculation, or climate control feedback ready for Arduino IDE, MicroPython, or MicroBlocks.