esp-idf/examples/peripherals/adc/README.md

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# Example: ADC1
This test code shows how to configure ADC1 and read the voltage connected to GPIO pin.
### ADC1 functions:
ADC1_CHANNEL_6: GPIO34, voltage range [0V..1.1V], the data range [0..4095]
### Test:
Please connect the test voltage to GPIO34