123 lines
3.3 KiB
C
Executable File
123 lines
3.3 KiB
C
Executable File
#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <linux/i2c-dev.h>
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#include <sys/ioctl.h>
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#define MAX_MEASURES 60 // To store 60 sound level measurements
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int main()
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{
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int file;
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char data;
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int soundLevels[MAX_MEASURES];
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int index = 0;
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int sum = 0;
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int i;
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FILE *fileOutput; // File pointer for writing to file
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// Initialize the soundLevels array
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for (i = 0; i < MAX_MEASURES; i++) {
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soundLevels[i] = 0;
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}
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// Open I2C1 for reading the sound meter module registers
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if ((file = open("/dev/i2c-1", O_RDWR)) < 0)
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{
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perror("Failed to open I2C1!");
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exit(1);
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}
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// 0x48 is the decibel meter I2C address
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if (ioctl(file, I2C_SLAVE, 0x48) < 0)
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{
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perror("db Meter module is not connected/recognized at I2C addr = 0x48");
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close(file);
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exit(1);
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}
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while (1)
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{
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// Decibel value is stored in register 0x0A
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data = 0x0A;
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// Write: send 1 byte from data (memory address pointer) to file
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if (write(file, &data, 1) != 1)
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{
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perror("Failed to write register 0x0A");
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close(file);
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exit(1);
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}
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// Read the sound level from register 0x0A
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if (read(file, &data, 1) != 1)
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{
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perror("Failed to read register 0x0A");
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close(file);
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exit(1);
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}
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// Insert the new reading into the array
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sum -= soundLevels[index]; // Subtract the old value to maintain the sum
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soundLevels[index] = data; // Store the new value
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sum += soundLevels[index]; // Add the new value to the sum
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// Move to the next index, wrap around if needed
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index = (index + 1) % MAX_MEASURES;
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// Calculate the moving average (sum of the last 60 values)
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int movingAverage = sum / MAX_MEASURES;
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// Find the max and min values in the soundLevels array
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int max = soundLevels[0];
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int min = soundLevels[0];
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for (i = 1; i < MAX_MEASURES; i++)
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{
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if (soundLevels[i] > max) {
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max = soundLevels[i];
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}
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if (soundLevels[i] < min) {
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min = soundLevels[i];
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}
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}
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// Open the file to write the moving average (overwrite)
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fileOutput = fopen("/var/www/nebuleair_pro_4g/sound_meter/moving_avg_minute.txt", "w");
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if (fileOutput == NULL)
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{
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perror("Failed to open file for writing");
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close(file);
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exit(1);
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}
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// Write the moving average to the file
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fprintf(fileOutput, "%d %d %d\n", movingAverage, max, min);
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// Close the file after writing
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fclose(fileOutput);
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// Display the current sound level and the moving average
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printf("Current Sound level: %d\n", data);
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printf("Current index: %d\n", index);
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printf("Sound levels array: ");
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for (i = 0; i < MAX_MEASURES; i++)
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{
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printf("%d ", soundLevels[i]);
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}
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printf("\nMax Sound level: %d\n", max);
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printf("Min Sound level: %d\n", min);
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printf("Moving Average (Last 60 seconds): %d\n\n", movingAverage);
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// Wait for 1 second before taking the next measurement
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sleep(1);
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}
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close(file);
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return 0;
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}
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