Xbee3 Micropython and TE MS5637 Pressure Sensor


This details an example of interfacing TE Connectivity's MS5637 barometric pressure sensor to Digi International's XBee3 intelligent wireless module (programmed with 802.15.4 protocol firmware). The project uses the MS5637 sensor included on TE's weather shield connected over I2C to Digi International's Grove development board with an Xbee 3 wireless module plugged in. A Micropython script running on the Xbee3 communicates with the MS5637 sensor to read the I2C address and trigger/measure barometric pressure and temperature.

Hardware Requirements

Supplier Documentation

Hardware Setup

TE Weather Shield

TE Connectivity’s Weather Shield is an Arduino form factor sensor evaluation board with five TE environmental sensors mounted. The five sensors are the HTU21D Humidity/Temperature Sensor, MS5637 Pressure Sensor, MS8607 Pressure Sensor, TSYS01 Temperature Sensor, and TSD305-1C55 Contactless Temperature Sensor. All five sensors communicate on the I2C bus which is routed through a CD74HC4502 mux/demux IC to provide switching of the I2C bus to the various sensors. For selection of the HTU21D and MS5637 sensors the inputs CA, CB and EN need to be set “low”.

Xbee SMT Grove Board

Digi International’s Xbee SMT Grove board is a development platform allowing use of multiple SMT form factor Xbee wireless modules. Various Xbee signals, including I2C, are routed to eight grove connectors on the board to allow easy interface to external devices.

Example Code


MicroPython code that runs on a Xbee 3 wireless module connected to an MS5637 pressure sensor over I2C. The example code scans the I2C bus and prints active addresses, resets the sensor, reads calibration data stored in onboard PROM and reads/converts barometric pressure and humidity in a continuous loop.

TE Connectivity MS5637 Sensor Calculation Background

Configuration settings and calculations used are based on MS5637-02BA03 datasheet per below: