~~META:description abstract=Sound based laser show~~ laser microcontroller audio lighting

Sound based laser show

• High and Mid controls 2 lissajouss motors
• Low controls duty
• Sens. adj. from 0.1 to 10

schematic.svg

main.c

#define F_CPU 20000000
 
// Trigger on PD1
// Output on OC0A (PD6)
 
// Low on ADC0 / PC0
// Mid on ADC1 / PC1
// High on ADC2 / PC2
 
#define ENABLE Bit(PORTB).bit0
 
// Fan1 on OC0A / PD6
// Fan2 on OC0B / PD5
// Duty on OC2A / PB3 (cfl MOSI !)
 
//global
volatile uint8_t g_ch = 0;
volatile float g_offset[3] = {-560, -560, -560};
volatile float g_coef[3] = {0.57, 0.57, 0.57};
 
//init
void init(void) {
	// Inputs
	PORTB = 0x01; // Pull-up on PB0
 
	// Outputs
	sbi(DDRD, PD5); // Fan2
	sbi(DDRD, PD6); // Fan1
	sbi(DDRB, PB3); // Duty
 
	//Timer 0
	TCCR0A = 0x03; // Fast PWM
	TCCR0B = 0x01; // Presc. = 1
	OCR0A = 0x00; // 0%
	OCR0B = 0x00; // 0%
 
	//Timer 2
	TCCR2A = 0x03; // Fast PWM
	TCCR2B = 0x01; // Presc. = 1
	OCR2A = 0x00; // 0%
}
 
// Interrupts
SIGNAL(ADC_CONV) {
	uint8_t v;
	v = g_coef[g_ch] * (ADCW + g_offset[g_ch]);
	switch(g_ch) {
		case 0 : OCR0A = v; break;
		case 1 : OCR0B = v; break;
		case 2 : OCR2A = v; break;
	}
	g_ch = (g_ch >= 2) ? 0 : g_ch + 1;
	ADMUX = g_ch;
}
 
// Main
int main(void) {
	init();
 
	while(1) {
		if(ENABLE) {
			TCCR0A = 0xa3;
			TCCR2A = 0x83;
		}else{
			TCCR0A = 0x03;
			TCCR2A = 0x03;
		}
		_delay_ms(100);
	}
 
	return 0;
}