mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
30 lines
752 B
Markdown
30 lines
752 B
Markdown
# Example: ADC2
|
|
|
|
This test code shows how to configure ADC2 and read the voltage connected to GPIO pin.
|
|
|
|
|
|
### ADC2 functions:
|
|
|
|
ADC1_CHANNEL_7: GPIO27, voltage range [0V..3.1V], the data range [0..4095],
|
|
saturates at about 1.1V.
|
|
|
|
DAC_CHANNEL_1: GPIO25, output range [0V..3.3V]
|
|
|
|
|
|
### Test:
|
|
|
|
Please choose the channel (GPIO) to output DAC signals and the channel to input
|
|
signals to ADC by menuconfig:
|
|
|
|
make menuconfig
|
|
|
|
Then connect two pins by a wire directly.
|
|
|
|
E.g. Choose GPIO27 for ADC and GPIO 25 for DAC in menuconfig (default option).
|
|
Then connect them up.
|
|
|
|
Connection of ADC and DAC to the same pin is also allowed. In this case, you don't
|
|
have to connect by a wire externally. E.g. choose GPIO 26 for both ADC and DAC in
|
|
menuconfig.
|
|
|