Undocumented Sensor IC in Zen

The sensor breakout board on my new PurpleAir Zen has three ICs on it. Two are clearly the documented BME688 and the Kionix KX122-1037 accelerometer used for tap control. There’s a third sensor opposite the BME688 that’s in a package similar to many gas, pressure, and humidity sensors on the market. What is this sensor?

Well spotted! This is the Bosch BMP581, which is being rolled out on PurpleAir Zen, Flex, and Touch devices. The BMP581 isn’t currently used by the sensor’s firmware, but we do have plans to add support in the future.

Thank you for the information.