Problem with image capture while using analogWrite()

[cowhen]

Hello all,

I built a lasershow unit using an arduino and galvos. Each galvo is connected to an output pin and is driven using the analogWrite() command. So far, this works fine.

Now I want to use the video experimenter to capture a frame of the laser image that my device projects. My problem is: The initialize functions break the ability to control my galvos. I want my ardino to control the galvos and then capture a single image. Then the control of the galvos is to be resumed.

I tried to put together a small code example of what I am trying to do. The two analogWrite() command in the loop() are what is required to drive my laser show. How can I capture an image without this breaking?

Thank you so much in advance!

Kind regards,
cowhen

//

video

#include 

#include 

#define W 128

#define H 96



TVout tv;

unsigned char x,y;

char s[32];

int count_j = 0;

//

/video



int laser_pin = 12;

int x_speaker_pin = 3;

int y_speaker_pin = 5;





void initOverlay() {

TCCR1A = 0;

// Enable timer1.  ICES0 is set to 0 for falling edge detection on input capture pin.

TCCR1B = _BV(CS10);



// Enable input capture interrupt

TIMSK1 |= _BV(ICIE1);



// Enable external interrupt INT0 on pin 2 with falling edge.

EIMSK = _BV(INT0);

EICRA = _BV(ISC11);

}



void initInputProcessing() {

// Analog Comparator setup

ADCSRA &= ~_BV(ADEN); // disable ADC

ADCSRB |= _BV(ACME); // enable ADC multiplexer

ADMUX &= ~_BV(MUX0); // select A2 for use as AIN1 (negative voltage of comparator)

ADMUX |= _BV(MUX1);

ADMUX &= ~_BV(MUX2);



ACSR &= ~_BV(ACIE);  // disable analog comparator interrupts

ACSR &= ~_BV(ACIC);  // disable analog comparator input capture

}







void setup()   {

//----video

//tv.begin(PAL,W,H);

//tv.end();



tv.select_font(font4x6);

tv.fill(0);

//

/video



pinMode(laser_pin, OUTPUT);

pinMode(x_speaker_pin, OUTPUT);

pinMode(y_speaker_pin, OUTPUT);

}



void loop()

{

analogWrite(y_speaker_pin, 50);

analogWrite(x_speaker_pin, 25);





if (count_j == 0)

{

initOverlay();

initInputProcessing();

tv.begin(PAL,W,H);

tv.capture();

tv.end();

count_j++;

}

}

[044hnoor]

Then the control of the galvos is to be resumed.

I tried to put together a small code example of what I am trying to do. The two analogWrite() command in the loop() are what is required to drive my laser show.

[Author]

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