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microphone_adc
for Raspberry Pi Pico™ 2, submitted by flashmypico

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/** * Copyright (c) 2021 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include <stdio.h> #include "pico/stdlib.h" #include "hardware/gpio.h" #include "hardware/adc.h" #include "hardware/uart.h" #include "pico/binary_info.h" /* Example code to extract analog values from a microphone using the ADC with accompanying Python file to plot these values Connections on Raspberry Pi Pico board, other boards may vary. GPIO 26/ADC0 (pin 31)-> AOUT or AUD on microphone board 3.3v (pin 36) -> VCC on microphone board GND (pin 38) -> GND on microphone board */ #define ADC_NUM 0 #define ADC_PIN (26 + ADC_NUM) #define ADC_VREF 3.3 #define ADC_RANGE (1 << 12) #define ADC_CONVERT (ADC_VREF / (ADC_RANGE - 1)) int main() { stdio_init_all(); printf("Beep boop, listening...\n"); bi_decl(bi_program_description("Analog microphone example for Raspberry Pi Pico")); // for picotool bi_decl(bi_1pin_with_name(ADC_PIN, "ADC input pin")); adc_init(); adc_gpio_init( ADC_PIN); adc_select_input( ADC_NUM); uint adc_raw; while (1) { adc_raw = adc_read(); // raw voltage from ADC printf("%.2f\n", adc_raw * ADC_CONVERT); sleep_ms(10); } }

This firmware image was imported from the pico-examples repository.

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Homepage: https://github.com/raspberrypi/pico-examples

Repository: https://github.com/raspberrypi/pico-examples/tree/master/adc/microphone_adc

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