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AnalogMicAudio_Alarm.ino
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AnalogMicAudio_Alarm.ino
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/**
@file AnalogMicAudio_Alarm.ino
@author rakwireless.com
@brief The analog microphone detects the noise threshold and when the ambient noise is greater than the set threshold,
a warning will be generated. And the LED of WisBase will lights.
@note This example need use the RAK18040 analog microphone module.
@version 0.1
@date 2022-08-29
@copyright Copyright (c) 2022
*/
#include "audio.h" // Click here to install the library: http://librarymanager/All#RAKwireless-Audio
#include <Arduino.h>
// GPIO pin numbers
#define pDIN 21
NAU85L40B MIC(0x1D);
// Create the I2S port using a PIO state machine
I2S i2s(INPUT);
const int sampleRate = 16000; // sample rate in Hz
// buffer to read samples into, each sample is 16-bits
short sampleBuffer[BUFFER_SIZE];
//Alarm threshold
int audio_threshold = 1000; //The threshold value of the noise trigger can be modified according to the environmental conditions
int g_alarm = 0;
int abs_int(short data);
void setup()
{
pinMode(WB_IO2, OUTPUT);
digitalWrite(WB_IO2, HIGH);
delay(500);
pinMode(LED_GREEN, OUTPUT);
pinMode(LED_BLUE, OUTPUT);
digitalWrite(LED_BLUE, LOW);
digitalWrite(LED_GREEN, LOW);
// Initialize Serial for debug output
time_t timeout = millis();
Serial.begin(115200);
while (!Serial)
{
if ((millis() - timeout) < 3000)
{
delay(100);
}
else
{
break;
}
}
i2s.setDATA(pDIN);
i2s.setBitsPerSample(16);
i2s.setFrequency(sampleRate);
i2s.begin();
MIC.begin();
MIC.config(sampleRate, (MIC_CHANNEL1), I2S_SAMPLE_16BIT); // |MIC_CHANNEL2
delay(500);
Serial.println("=====================================");
}
void loop()
{
uint32_t sum = 0;
// print samples to the serial monitor or plotter
for (int i = 0; i < BUFFER_SIZE; i++) {
int16_t l = 0, r = 0;
i2s.read16(&l, &r);
sampleBuffer[i] = l;
sum = sum + abs(sampleBuffer[i]);
}
int aver = sum / BUFFER_SIZE;
if (aver > audio_threshold)
{
/*You can add your alarm processing tasks here*/
g_alarm++;
Serial.printf("Alarm %d\r\n",g_alarm);
digitalWrite(LED_BLUE, HIGH);
digitalWrite(LED_GREEN, HIGH);
delay(1000);
digitalWrite(LED_BLUE, LOW);
digitalWrite(LED_GREEN, LOW);
}
}
int abs_int(short data)
{
if (data > 0) return data;
else return (0 - data);
}