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97 lines
2.3 KiB
Markdown
97 lines
2.3 KiB
Markdown
| Supported Targets | ESP32 |
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# ADC2 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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In this example, we use ADC2 to measure the output of DAC.
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## How to use example
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### Hardware Required
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#### ESP32 platform
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* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
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* A USB cable for power supply and programming
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We use ADC1_CHANNEL_7 (GPIO27) and DAC_CHANNEL_1 (GPIO25) by default, you need to short the two GPIOs (if you have changed the ADC2 and DAC channel, please refer to Chapter 4.11 of the `ESP32 Technical Reference Manual` to get the pin number).
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#### ESP32-S2 platform
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* A development board with ESP32S2 SoC
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* A USB cable for power supply and programming
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We use ADC1_CHANNEL_7 (GPIO18) and DAC_CHANNEL_1 (GPIO17) by default, you need to short the two GPIOs (if you have changed the ADC2 and DAC channel, please refer to the `ESP32S2 Technical Reference Manual` to get the pin number).
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### Configure the project
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```
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idf.py menuconfig
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```
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* Set ADC2 and DAC channel in "Example Configuration"
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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Running this example, you will see the following log output on the serial monitor:
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### ESP32 platform
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```
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ADC channel 7 @ GPIO 27, DAC channel 1 @ GPIO 25.
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adc2_init...
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start conversion.
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1: 150
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2: 203
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3: 250
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4: 300
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5: 351
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6: 400
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7: 441
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8: 491
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9: 547
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10: 595
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...
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```
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#### ESP32-S2 platform
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```
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ADC channel 7 @ GPIO 18, DAC channel 1 @ GPIO 17.
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adc2_init...
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start conversion.
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1: 150
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2: 203
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3: 250
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4: 300
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5: 351
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6: 400
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7: 441
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8: 491
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9: 547
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10: 595
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...
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```
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## Troubleshooting
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* program upload failure
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* Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
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* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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