6e647c6f26
adc/microphone_adc - Read analog values from a microphone and plot the measured sound amplitude. i2c/bmp280_i2c - Read and convert temperature and pressure data from a BMP280 sensor, attached to an I2C bus. i2c/lis3dh_i2c - Read acceleration and temperature value from a LIS3DH sensor via I2C i2c/mcp9808_i2c - Read temperature, set limits and raise alerts when limits are surpassed. i2c/mma8451_i2c - Read acceleration from a MMA8451 accelerometer and set range and precision for the data. i2c/mpl3115a2_i2c - Interface with an MPL3115A2 altimeter, exploring interrupts and advanced board features, via I2C. i2c/oled_i2c - Convert and display a bitmap on a 128x32 SSD1306-driven OLED display i2c/pa1010d_i2c - Read GPS location data, parse and display data via I2C. i2c/pcf8523_i2c - Read time and date values from a real time clock. Set current time and alarms on it. uart/lcd_uart - Display text and symbols on a 16x02 RGB LCD display via UART
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/**
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* Copyright (c) 2021 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdio.h>
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#include "pico/stdlib.h"
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#include "hardware/gpio.h"
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#include "hardware/adc.h"
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#include "hardware/uart.h"
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#include "pico/binary_info.h"
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/* Example code to extract analog values from a microphone using the ADC
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with accompanying Python file to plot these values
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Connections on Raspberry Pi Pico board, other boards may vary.
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GPIO 26/ADC0 (pin 31)-> AOUT or AUD on microphone board
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3.3v (pin 36) -> VCC on microphone board
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GND (pin 38) -> GND on microphone board
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*/
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#define ADC_NUM 0
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#define ADC_PIN (26 + ADC_NUM)
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#define ADC_VREF 3.3
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#define ADC_RANGE (1 << 12)
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#define ADC_CONVERT (ADC_VREF / (ADC_RANGE - 1))
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int main() {
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stdio_init_all();
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printf("Beep boop, listening...\n");
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bi_decl(bi_program_description("Analog microphone example for Raspberry Pi Pico")); // for picotool
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bi_decl(bi_1pin_with_name(ADC_PIN, "ADC input pin"));
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adc_init();
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adc_gpio_init( ADC_PIN);
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adc_select_input( ADC_NUM);
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uint adc_raw;
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while (1) {
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adc_raw = adc_read(); // raw voltage from ADC
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printf("%.2f\n", adc_raw * ADC_CONVERT);
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sleep_ms(10);
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}
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return 0;
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}
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