mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
94 lines
2.2 KiB
Markdown
94 lines
2.2 KiB
Markdown
# ADC2 Example
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
In this example, we use ADC2 to measure the output of DAC.
|
|
|
|
## How to use example
|
|
|
|
### Hardware Required
|
|
|
|
#### ESP32 platform
|
|
|
|
* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
|
|
* A USB cable for power supply and programming
|
|
|
|
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).
|
|
|
|
#### ESP32-S2 platform
|
|
|
|
* A development board with ESP32S2BETA SoC
|
|
* A USB cable for power supply and programming
|
|
|
|
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).
|
|
|
|
### Configure the project
|
|
|
|
```
|
|
idf.py menuconfig
|
|
```
|
|
* Set ADC2 and DAC channel in "Example Configuration"
|
|
|
|
### Build and Flash
|
|
|
|
Build the project and flash it to the board, then run monitor tool to view serial output:
|
|
|
|
```
|
|
idf.py -p PORT 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:
|
|
|
|
### ESP32 platform
|
|
|
|
```
|
|
ADC channel 7 @ GPIO 27, DAC channel 1 @ GPIO 25.
|
|
adc2_init...
|
|
start conversion.
|
|
1: 150
|
|
2: 203
|
|
3: 250
|
|
4: 300
|
|
5: 351
|
|
6: 400
|
|
7: 441
|
|
8: 491
|
|
9: 547
|
|
10: 595
|
|
...
|
|
```
|
|
|
|
#### ESP32-S2 platform
|
|
|
|
```
|
|
ADC channel 7 @ GPIO 18, DAC channel 1 @ GPIO 17.
|
|
adc2_init...
|
|
start conversion.
|
|
1: 150
|
|
2: 203
|
|
3: 250
|
|
4: 300
|
|
5: 351
|
|
6: 400
|
|
7: 441
|
|
8: 491
|
|
9: 547
|
|
10: 595
|
|
...
|
|
```
|
|
|
|
## Troubleshooting
|
|
|
|
* program upload failure
|
|
|
|
* Hardware connection is not correct: run `idf.py -p PORT 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.
|