esp-idf/examples/peripherals/temp_sensor

Supported Targets	ESP32-S2	ESP32-C3	ESP32-S3

Temperature Sensor Example

The ESP32-S2 and ESP32-C3 has a built-in temperature sensor. The temperature sensor module contains an 8-bit Sigma-Delta ADC and a temperature offset DAC.

The conversion relationship is the first two columns of the table below. Among them, offset = 0(default) is the main measurement option, and other values are extended measurement options.

DAC level	offset	measure range(℃)	measure error(℃)
0	-2	50 ~ 125	< 3
1	-1	20 ~ 100	< 2
2	0	-10 ~ 80	< 1
3	1	-30 ~ 50	< 2
4	2	-40 ~ 20	< 3

How to use example

Before project configuration and build, be sure to set the correct chip target using idf.py set-target <chip_name>.

Hardware Required

• A development board with ESP32-S2 or ESP32-C3 SoC (e.g., ESP32-S2-Saola-1, ESP32-S2-DevKitM-1, ESP32-C3-DevKitM-1, etc.)
• A USB cable for power supply and programming

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

Run idf.py -p PORT flash monitor to build, flash and monitor the project.

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

I (243) TempSensor: Initializing Temperature sensor
I (243) TempSensor: default dac 2, clk_div 6
I (243) TempSensor: Config temperature range [-10°C ~ 80°C], error < 1°C
I (253) TempSensor: Temperature sensor started
I (1253) TempSensor: Temperature out celsius 27.287399°C
I (2253) TempSensor: Temperature out celsius 26.848801°C
I (3253) TempSensor: Temperature out celsius 26.848801°C
I (4253) TempSensor: Temperature out celsius 27.287399°C
I (5253) TempSensor: Temperature out celsius 27.287399°C

Troubleshooting

For any technical queries, please open an issue on GitHub. We will get back to you soon.