Introduction
Off the shelf hardware is used to demonstrate integrating a temperature sensor with Digi International’s LTE-M/NB-IoT cellular smart modem. The project utilizes the XB3-C-A2-UT-001 mounted in an XBIB-U-DEV eval board wired to a Mikroelektronika Thermo 6 Click board over I2C. MicroPython example code is provided for the XBee3 smart modem to communicate with the Thermo 6 Click temperature sensor over I2C… Mikroelektronika’s Thermo 6 Click™ board uses Maxim’s MAX31875R0 temperature sensor.
Hardware Requirements
- XB3-C-A2-UT-001 Digi XBee3 LTE-M/NB-IoT Cellular Smart Modem at Digi-Key
- Mikroelektronika Thermo 6 Click™ board at Digi-Key
Accessories
- Digi International XBIB-U-DEV eval board at Digi-Key (note: male pin headers soldered to XBIB-U-DEV board 20 pin header to facilitate wiring)
Supplier Documentation
- Digi International XBee3 Cellular LTE-M/NB-IoT User Guide
- Digi International Digi MicroPython Programming Guide
- Digi International XBIB-U-DEV Reference Guide
- Digi International XBIB-U-DEV Schematic
- Mikroelektronika Thermo 6 Click™ board
- Maxim MAX31875 datasheet
:
Hardware Setup
Thermo 6 Click Board
| 1 - | 16 - |
|---|---|
| 2 - | 15 - |
| 3 - | 14 - |
| 4 - | 13 - |
| 5 - | 12 - SCL |
| 6 - | 11 - SDA |
| 7 - +3.3V | 10 - |
| 8 - GND | 9 - GND |
XB3 20 pin header
| 1 - +3.3V | 20 - |
|---|---|
| 2 - | 19 - SCL |
| 3 - NC | 18 - |
| 4 - NC | 17 - |
| 5 - NC | 16 - |
| 6 - NC | 15 - |
| 7 - SDA | 14 - |
| 8 - | 13 - |
| 9 - | 12 - |
| 10 - GND | 11 - |
Wiring Diagram
Example Code
Description
MicroPython code that runs on a Xbee 3 cellular module connected to a Thermo 6 Click board over I2C. The example code scans the I2C bus and prints active addresses, reads/prints the MAX31875 configuration register and reads/prints temperature in a continuous loop.