C, See

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Pushing the boat out to C, another lanuage which I've somehow avoided becoming familiar with, I decided to re-write my Ruby LED Binary Clock entirely in C. The code isn't brilliant, with a glut of consecutive "if" statements to determine which LEDs should be turned on. But it works!

Here's a snippet outlining a new idea I had whilst working in C, phasing the "off" phase of the LEDs to give a cool, pulsing up/down effect.

slept = 0;

for(x = 13;x >= 0;x--)
{
	int status;
	int led = leds[ x ];
	status = digitalRead( led );
	if( status == 1 )
	{
		slept += 20000;
		digitalWrite (led, LOW);
		usleep( 20000 );
	}
}

usleep( 300000 - slept );

There are 14 LEDs being turned on with a 50ms delay between each one for a maximum time of 700ms (if all LEDs were to be lit) to turn them on. Thus I had 300ms left to turn them all off, so I used a delay of 20ms.

« Back to index Posted on 2012-06-20 by Philip Howard