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Simple Temperature App
Ken Bannister edited this page Mar 31, 2017
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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.
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 |
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