This app collects readings from a temperature sensor. RIOT includes support for the JEDEC JC-42.4 standard, and this app uses a compliant sensor, the Microchip MCP9808.

Hardware

We connect the Adafruit MCP9808 breakout board to a SAMR21 Xplained Pro board via I2C. The pins are:

Function	SAMR21	MCP9808
I2C SCL	PA17	SCL
I2C SDA	PA16	SDA
3.3V	VCC	Vdd
Ground	GND	Gnd

Firmware

We use the test code in RIOT.

Terminal session:

kbee@gazelle:~/dev/riot/repo/tests/driver_jc42$ make term BOARD="samr21-xpro" PORT="/dev/ttyACM0"
/home/kbee/dev/riot/repo/dist/tools/pyterm/pyterm -p "/dev/ttyACM0" -b "115200"
2017-03-31 10:54:44,525 - INFO # Connect to serial port /dev/ttyACM0
Welcome to pyterm!
Type '/exit' to exit.
2017-03-31 10:54:45,555 - INFO # Testing sensor communication...[OK]
2017-03-31 10:54:45,556 - INFO # temperature: 19.25 C
2017-03-31 10:54:45,633 - INFO # Testing sensor communication...[OK]
2017-03-31 10:54:45,635 - INFO # temperature: 19.25 C
2017-03-31 10:54:46,647 - INFO # Testing sensor communication...[OK]
2017-03-31 10:54:46,649 - INFO # temperature: 19.31 C