Svenska ElektronikForumet

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/*
* SevenSegment sketch
* Shows numerals ranging from 0 through 9 on a single-digit display
* This example counts seconds from 0 to 9
*/

// bits representing segments A through G (and decimal point) for numerals 0-9
const byte numeral[10] = {
	//ABCDEFG /dp
	B11111011, // 0
	B01100000, // 1
	B11011100, // 2
	B11110100, // 3
	B01100110, // 4
	B10110110, // 5
	B10111110, // 6
	B11100000, // 7
	B11111110, // 8
	B11100110, // 9
};
// pins for decimal point and each segment
// dp,G,F,E,D,C,B,A
const int segmentPins[8] = { 5, 9, 8, 7, 6, 4, 3, 2 };
void setup()
{
	for (int i = 0; i < 8; i++)
	{
		pinMode(segmentPins[i], OUTPUT); // set segment and DP pins to output
	}
}
void loop()
{
	for (int i = 0; i <= 10; i++)
	{
		showDigit(i);
		delay(1000);
	}
	// the last value if i is 10 and this will turn the display off
	delay(2000); // pause two seconds with the display off
}
// Displays a number from 0 through 9 on a 7-segment display
// any value not within the range of 0-9 turns the display off
void showDigit(int number)
{
	boolean isBitSet;
	for (int segment = 1; segment < 8; segment++)
	{
		if (number < 0 || number > 9){
			isBitSet = 0; // turn off all segments
		}
		else{
			// isBitSet will be true if given bit is 1
			isBitSet = bitRead(numeral[number], segment);
		}
		//isBitSet = !isBitSet; // remove this line if common cathode display
		digitalWrite(segmentPins[segment], isBitSet);
	}
}

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isBitSet = bitRead(B11111011, 0);

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isBitSet = bitRead(B11111011, 5);