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

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# ADC1 Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example shows how to configure ADC1 and read the voltage connected to GPIO pin.
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## How to use example
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### Hardware Required
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* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
* A USB cable for power supply and programming
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In this example, we use `ADC_UNIT_1` by default, we need to connect a voltage source (0 ~ 3.3v) to GPIO34. If another ADC unit is selected in your application, you need to change the GPIO pin (please refer to Chapter 4.11 of the `ESP32 Technical Reference Manual`).
### Configure the project
```
make menuconfig
```
* Set serial port under Serial Flasher Options.
### Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
```
make -j4 flash monitor
```
(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
Running this example, you will see the following log output on the serial monitor:
```
Raw: 486 Voltage: 189mV
Raw: 435 Voltage: 177mV
Raw: 225 Voltage: 128mV
Raw: 18 Voltage: 79mV
```
## Troubleshooting
* program upload failure
* Hardware connection is not correct: run `make monitor`, and reboot your board to see if there are any output logs.
* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.