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- Analog to Digital Converter
- ===========================
- Overview
- --------
- ESP32 integrates two 12-bit SAR ("Successive Approximation Register") ADCs (Analog to Digital Converters) and supports measurements on 18 channels (analog enabled pins). Some of these pins can be used to build a programmable gain amplifier which is used for the measurement of small
- analog signals.
- The ADC driver API currently only supports ADC1 (9 channels, attached to GPIOs 32-39).
- Taking an ADC reading involves configuring the ADC with the desired precision and attentuation settings, and then calling adc1_get_voltage() to read the channel.
- It is also possible to read the internal hall effect sensor via ADC1.
- Application Example
- -------------------
- Reading voltage on ADC1 channel 0 (GPIO 36)::
- #include <driver/adc.h>
- ...
- adc1_config_width(ADC_WIDTH_12Bit);
- adc1_config_channel_atten(ADC1_CHANNEL_0,ADC_ATTEN_0db);
- int val = adc1_get_voltage(ADC1_CHANNEL_0);
- Reading the internal hall effect sensor::
- #include <driver/adc.h>
- ...
- adc1_config_width(ADC_WIDTH_12Bit);
- int val = hall_sensor_read();
- The value read in both these examples is 12 bits wide (range 0-4095).
- API Reference
- -------------
- Header Files
- ^^^^^^^^^^^^
- * `components/driver/include/driver/adc.h`
- Enumerations
- ^^^^^^^^^^^^
- .. doxygenenum:: adc1_channel_t
- .. doxygenenum:: adc_atten_t
- .. doxygenenum:: adc_bits_width_t
- Functions
- ^^^^^^^^^
- .. doxygenfunction:: adc1_config_width
- .. doxygenfunction:: adc1_config_channel_atten
- .. doxygenfunction:: adc1_get_voltage
- .. doxygenfunction:: hall_sensor_read
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