kopia lustrzana https://github.com/espressif/esp-idf
68 wiersze
2.7 KiB
ReStructuredText
68 wiersze
2.7 KiB
ReStructuredText
Temperature Sensor
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===================
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.. only:: esp32s3
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.. warning::
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This feature is not supported in v4.4
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Overview
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--------
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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.
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The conversion relationship is the first columns of the table below. Among them, offset = 0 is the main measurement option, and other values are extended measurement options.
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+--------+------------------------+------------------------+
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| offset | measure range(Celsius) | measure error(Celsius) |
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+========+========================+========================+
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| -2 | 50 ~ 125 | < 3 |
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+--------+------------------------+------------------------+
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| -1 | 20 ~ 100 | < 2 |
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+--------+------------------------+------------------------+
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| 0 | -10 ~ 80 | < 1 |
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+--------+------------------------+------------------------+
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| 1 | -30 ~ 50 | < 2 |
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+--------+------------------------+------------------------+
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| 2 | -40 ~ 20 | < 3 |
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+--------+------------------------+------------------------+
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Driver Usage
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------------
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1. 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.
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.. code-block:: c
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temp_sensor_config_t temp_sensor = {
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.dac_offset = TSENS_DAC_L2,
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.clk_div = 6,
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};
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temp_sensor_set_config(temp_sensor);
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2. Start the temp_sensor by calling :cpp:func:'temp_sensor_start'. The temperature sensor will now measure the temperature.
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3. To get the current temperature, take the example below as a reference, the value you get is in Celsius.
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.. code-block:: c
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float tsens_out;
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temp_sensor_read_celsius(&tsens_out);
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4. To stop the temperature sensor, please call :cpp:func:'temp_sensor_stop'.
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.. note::
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If you want dynamic reconfiguration, you need to stop the sensor first (temp_sensor_stop), set the new configuration (temp_sensor_set_config), then start the sensor again (temp_sensor_start).
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Application Example
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-------------------
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Temperature sensor reading example: :example:`peripherals/temp_sensor`.
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API Reference - Normal Temp Sensor
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----------------------------------
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.. include-build-file:: inc/temp_sensor.inc
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