The {IDF_TARGET_NAME} has a built-in temperature sensor used to measure the chip's internal temperature, and hard to measure the environmental temperature accurately. Being built-in means that the temperature sensor should work on any {IDF_TARGET_NAME} regardless of what board the chip is embedded in. The temperature sensor module contains an 8-bit Sigma-Delta ADC and a temperature offset DAC.
The conversion relationship is the first columns of the table below. Among them, Offset = 0 is the default measurement option, and other values are extended measurement options.
| Offset | Measurement Range (°C) | Measurement Error (°C) |
|---|---|---|
| -2 | 50 ~ 125 | < 3 |
| -1 | 20 ~ 100 | < 2 |
| 0 | -10 ~ 80 | < 1 |
| 1 | -30 ~ 50 | < 2 |
| 2 | -40 ~ 20 | < 3 |
- Initialize the temperature sensor by calling the function :cpp:func:`temp_sensor_set_config` and pass to it a :cpp:type:`temp_sensor_config_t` structure. The :cpp:type:`temp_sensor_config_t` structure should contain all the required parameters. See the example below.
temp_sensor_config_t temp_sensor = { .dac_offset = TSENS_DAC_L2, .clk_div = 6, }; temp_sensor_set_config(temp_sensor);
- Start the temperature sensor by calling :cpp:func:`temp_sensor_start`, and then the sensor will start to measure the temperature.
- To get the current temperature, you can take the example below as a reference, and the temperatures you get are in Celsius.
float tsens_out; temp_sensor_read_celsius(&tsens_out);
- To stop the temperature sensor, please call :cpp:func:`temp_sensor_stop`.
Note
To realize dynamic reconfiguration, you need to stop the sensor first with :cpp:func:`temp_sensor_stop`, then set the new configuration with :cpp:func:`temp_sensor_set_config`, and then re-start the sensor with :cpp:func:`temp_sensor_start`.
For examples of the temperature sensor, please refer to :example:`peripherals/temp_sensor`.
.. include-build-file:: inc/temp_sensor.inc