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Merge branch 'doc/adc_example_doc_improve' into 'master'
doc(adc): Update README.md file of adc example. See merge request idf/esp-idf!2665
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Wang Jia Lin
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# Example: ADC1
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# ADC1 Example
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This test code shows how to configure ADC1 and read the voltage connected to GPIO pin.
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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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### ADC1 functions:
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## How to use example
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ADC1_CHANNEL_6: GPIO34, voltage range [0V..1.1V], the data range [0..4095]
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### Hardware Required
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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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### Test:
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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`).
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Please connect the test voltage to GPIO34
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### Configure the project
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```
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make menuconfig
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```
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* Set serial port under Serial Flasher Options.
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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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make -j4 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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```
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Raw: 486 Voltage: 189mV
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Raw: 435 Voltage: 177mV
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Raw: 225 Voltage: 128mV
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Raw: 18 Voltage: 79mV
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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 `make 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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# Example: ADC2
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# ADC2 Example
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This test code shows how to configure ADC2 and read the voltage connected to GPIO pin.
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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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### ADC2 functions:
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## How to use example
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ADC1_CHANNEL_7: GPIO27, voltage range [0V..3.1V], the data range [0..4095],
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saturates at about 1.1V.
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### Hardware Required
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DAC_CHANNEL_1: GPIO25, output range [0V..3.3V]
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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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### Test:
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### Configure the project
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Please choose the channel (GPIO) to output DAC signals and the channel to input
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signals to ADC by menuconfig:
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```
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make menuconfig
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```
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make menuconfig
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* Set serial port under Serial Flasher Options.
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* Set ADC2 and DAC channel in "Example Configuration"
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Then connect two pins by a wire directly.
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### Build and Flash
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E.g. Choose GPIO27 for ADC and GPIO 25 for DAC in menuconfig (default option).
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Then connect them up.
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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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Connection of ADC and DAC to the same pin is also allowed. In this case, you don't
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have to connect by a wire externally. E.g. choose GPIO 26 for both ADC and DAC in
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menuconfig.
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```
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make -j4 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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```
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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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## Troubleshooting
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* program upload failure
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* Hardware connection is not correct: run `make 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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