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Analog to Digital Converter (ADC)

Overview

This example shows how to use the Analog to Digital Converter (ADC) functionality of a module

Description

The example is developed on the basis of standard firmware. The added code is in the comment range of /* User Code */ and /* End User Code */.

This demonstrates how to assign a pin to enable ADC functionality. Once it was successfully initialized, the voltage value at the set pin will be printed to the serial port.

  • Assigning a pin to enable ADC function

    Example: Using Pin #4

    gpio_adc.pin_num = 4 \\Pin #4 ADC enabled

  • Based on testing, difference between the actual voltage and the printed voltage to the serial port is within 50mV (for RAK811 module)

Pin support for different modules:

for RAK811(L)： 2，3，4，5，15，20，22，23
for RAK811(H)： 2，3，4，20，22，23