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--- en:examples:sensor:mic [2015/12/28 15:50] – kaupo.raid
+++ en:examples:sensor:mic [2020/07/20 12:00] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Microphone ======
+//Necessary knowledge:
+[HW] [[en:hardware:homelab:digi]],
+[AVR] [[et:avr:dac]], [[et:avr:adc]]
+[LIB] [[en:software:homelab:library:adc]], [LIB] [[en:software:homelab:library:module:lcd_graphic]],
+[LIB] [[en:software:homelab:library:module:sensor]]//
+===== Theory =====
+[{{ :en:examples:sensor:mic.jpg?150|Microphone}}]
+===== Practice =====
+<code c>
+// Homelab microphone example
+// Microphone sound level graph is shown on LCD and when sound level exceeds threshold an led lights up.
+#include <stdio.h>
+#include <homelab/adc.h>
+#include <homelab/delay.h>
+#include <homelab/module/sensors.h>
+#include <homelab/module/lcd_gfx.h>
+#define ADC_CHANNEL 12
+// Main program
+int main(void)
+{
+	signed short mic;
+	BYTE n;
+	// LCD setup function
+	lcd_gfx_init();
+	// ADC muunduri seadistamine
+	adc_init(ADC_REF_AVCC, ADC_PRESCALE_8);
+	// Set LED pin as output
+	pin_setup_output(led_yellow);
+	pin_set(led_yellow);
+	// LCD background draw
+	FgColor = BLUE;
+	BkColor = YELLOW;
+	lcd_gfx_fillScreen(YELLOW);
+	lcd_gfx_goto_char_xy(6,1);
+	lcd_gfx_write_string("Mikrofon");
+	lcd_gfx_drawLine(0,40,128,40,BLUE);
+	FgColor = RED;
+	// Infinite loop
+	while (1)
+	{
+		// Clear graph area from LCD
+		lcd_gfx_fillRect(0, 41, 128, 119, WHITE);
+		// Drawing the graph on LCD. Width of LCD is 128 pixels.
+		for (n = 0; n <= 128; n++)
+		{
+			// Microphone ADC channel read and converting to different values range.
+			mic = map(adc_get_value(ADC_CHANNEL), 0, 2047, 0, 120);
+			// Draw value on graph as dot
+			lcd_gfx_drawPixel(n, 160 - mic + 2);
+			// Light up LED if value exceeds threshold (30)
+			if(mic > 30)
+			{
+				pin_toggle(led_yellow);
+			}
+		}
+	}
+}
+</code>