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README.md	add Comment for touchpad	2019-08-07 11:39:17 +08:00

README.md

ESP32-S2 Temperature Sensor Example

The ESP32-S2 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

Log 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