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All I’m trying to do is to use the demo code to overlay, there is nothing wrong with the code or the soldering of the board. However it does not work with pal or ntsc however when I use the other examples for sync only they work perfectly. Having major problems just trying to display the example overlay on the screen having transparent lines and text and random weird text bellow it. I dunno what else to say, I’ve tried using 660 ohm resistor however it does not change the brightness of the letters. I think the chip or the coward is damaged.
Oky now i have it up on the screen however there is a massive issue, whenever i select sync only and set it to v-input the lines are randomly flicking at the text is spazzing out but the horizontal line seems to be ok, evrything else seems to just not want to work, i’ve tried both pal and ntsc, could this be a problem with the board i ordered from you guys?
:'( :'( :'( :'( :'( :'(Nothing comes up on the screen, i’ve tried changing the d9 to v but still nothing.
I’m using this code
#include
#include
#define W 136
#define H 96
TVout tv;
unsigned char x, y;
unsigned char originx = 5;
unsigned char originy = 80;
unsigned char plotx = originx;
unsigned char ploty = 40;
char s[32];
unsigned int n = 0;
int index = 0;
int messageLen = 32;
char message[] = "...OVERLAY TEXT AND GRAPHICS ON A VIDEO SIGNAL...OVERLAY TEXT AND GRAPHICS ON A VIDEO SIGNAL";
char saveChar;
void setup() {
tv.begin(NTSC, W, H);
initOverlay();
tv.select_font(font6x8);
tv.fill(0);
drawGraph();
randomSeed(analogRead(0));
}
// Initialize ATMega registers for video overlay capability.
// Must be called after tv.begin().
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(ISC01);
}
// Required to reset the scan line when the vertical sync occurs
ISR(INT0_vect) {
display.scanLine = 0;
}
void loop() {
saveChar = message[index + 22];
message[index + 22] = ' ';
for (int x = 6; x >= 0; x--) {
if (x < 6) {
tv.delay_frame(1);
}
tv.print(x, 87, message + index);
for (byte y = 87; y < 96; y++) {
tv.draw_line(0, y, 5, y, 0);
tv.draw_line(128, y, 134, y, 0);
}
}
message[index + 22] = saveChar;
index++;
if (index > 45) {
index = 0;
}
sprintf(s, "%dms", millis());
tv.print(0, 0, s);
if (plotx++ > 120) {
tv.fill(0);
drawGraph();
plotx = originx + 1;
return;
}
byte newploty = ploty + random(0, 7) - 3;
newploty = constrain(newploty, 15, originy);
tv.draw_line(plotx - 1, ploty, plotx, newploty, 1);
ploty = newploty;
}
void drawGraph() {
tv.draw_line(originx, 15, originx, originy, 1);
tv.draw_line(originx, originy, 120, originy, 1);
for (byte y = originy; y > 15; y -= 4) {
tv.set_pixel(originx - 1, y, 1);
tv.set_pixel(originx - 2, y, 1);
}
for (byte x = originx; x < 120; x += 4) {
tv.set_pixel(x, originy + 1, 1);
tv.set_pixel(x, originy + 2, 1);
}
}
When i flick over to sync, nothing comes to the screen either and the screen goes into timeout (waiting for image).
