Thermometer
Overview
This sample application periodically measures the ambient temperature at 1Hz. The result is written to the console.
Wiring
VDD pin should be connected to 2.3V to 5.5V GND pin connected to 0V VOUT pin connected to the ADC input pin.
An overlay is provided for the nrf52840dk/nrf52840 board with the sensor connected to pin AIN7.
Building and Running
To build for the nrf52840dk/nrf52840 board use:
west build -b nrf52840dk/nrf52840 samples/sensor/thermometer
west flash
To build for other boards and ambient temperature sensors, enable the sensor
node that supports SENSOR_CHAN_AMBIENT_TEMP and use an overlay to create an
alias named ambient-temp0 to link to the node. See the overlay used for the
nrf52840dk/nrf52840 board within this sample:
boards/nrf52840dk_nrf52840.overlay
Temperature Alert
If the attached sensor supports alerts when the temperature drifts above or
below a threshold, the sample will enable the sensor’s trigger functionality.
This will require the sensor’s TRIGGER KConfig setting to be enabled. An
example of this setup is provided for the frdm_k22f board, using
boards/frdm_k22f.conf.
Sample Output
*** Booting Zephyr OS build zephyr-v3.3.0-2354-gb4f4bd1f1c22 ***
Thermometer Example (arm)
Temperature device is 0x525c, name is tcn75a@48
Set temperature lower limit to 25.5°C
Set temperature upper limit to 26.5°C
Enabled sensor threshold triggers
Temperature is 25.0°C
Temperature is 25.0°C
Temperature is 25.0°C
Temperature is 25.0°C
Temperature is 25.5°C
Temperature above threshold: 26.5°C
Temperature is 26.5°C