Arduino 7 segment LED timer with 74HC595 module - Revision history

Admin at 03:29, 19 March 2012

2012-03-19T03:29:29Z

← Older revision		Revision as of 03:29, 19 March 2012
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	Because the lack of single 7 segment LED, I have to take a 4-digit 7segment at hand instead, just light up one digit of four. The principle of them is almost same in general. Since not all the 7 segment LED is same, so we must work out which pin for which segment using multimeter. Then find out appropriate binary number to represent the high or low level to these pins and convert it to decimal number sending to 74hc595.Schematic wiring diagram is below.		Because the lack of single 7 segment LED, I have to take a 4-digit 7segment at hand instead, just light up one digit of four. The principle of them is almost same in general. Since not all the 7 segment LED is same, so we must work out which pin for which segment using multimeter. Then find out appropriate binary number to represent the high or low level to these pins and convert it to decimal number sending to 74hc595.Schematic wiring diagram is below.

	[[Timer schematic1.jpg]]		[[File:Timer schematic1.jpg\|600px]]

	Relevant code		Relevant code

2012-03-19T03:28:45Z

← Older revision		Revision as of 03:28, 19 March 2012
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	This time I will made a simple timer which can count up and count down from 0 to 99 using 7 segment LED and 74hc595 shift and register breakout board. Using more 7 segment LED and 74hc595 module can accomplish multi-digit timer counting up and counting down if you wish.		This time I will made a simple timer which can count up and count down from 0 to 99 using 7 segment LED and 74hc595 shift and register breakout board. Using more 7 segment LED and 74hc595 module can accomplish multi-digit timer counting up and counting down if you wish.

	[[File:Seven segment display.jpg\|~~250px~~]]		[[File:Seven segment display.jpg\|200px]]

	A 7-segment display consists of eight LEDs arrange to form the digit eight, with a decimal point. Individually on or off, they can be combined to produce simplified representations of the Arabic numerals. Often the seven segments are arranged in an oblique (slanted) arrangement, which aids readability. In most applications, the seven segments are of nearly uniform shape and size.		A 7-segment display consists of eight LEDs arrange to form the digit eight, with a decimal point. Individually on or off, they can be combined to produce simplified representations of the Arabic numerals. Often the seven segments are arranged in an oblique (slanted) arrangement, which aids readability. In most applications, the seven segments are of nearly uniform shape and size.

2012-03-19T03:28:30Z

← Older revision		Revision as of 03:28, 19 March 2012
Line 1:		Line 1:
	This time I will made a simple timer which can count up and count down from 0 to 99 using 7 segment LED and 74hc595 shift and register breakout board. Using more 7 segment LED and 74hc595 module can accomplish multi-digit timer counting up and counting down if you wish.		This time I will made a simple timer which can count up and count down from 0 to 99 using 7 segment LED and 74hc595 shift and register breakout board. Using more 7 segment LED and 74hc595 module can accomplish multi-digit timer counting up and counting down if you wish.

	[[File:Seven segment display.jpg]]		[[File:Seven segment display.jpg\|250px]]

	A 7-segment display consists of eight LEDs arrange to form the digit eight, with a decimal point. Individually on or off, they can be combined to produce simplified representations of the Arabic numerals. Often the seven segments are arranged in an oblique (slanted) arrangement, which aids readability. In most applications, the seven segments are of nearly uniform shape and size.		A 7-segment display consists of eight LEDs arrange to form the digit eight, with a decimal point. Individually on or off, they can be combined to produce simplified representations of the Arabic numerals. Often the seven segments are arranged in an oblique (slanted) arrangement, which aids readability. In most applications, the seven segments are of nearly uniform shape and size.

2012-03-19T03:27:25Z

← Older revision		Revision as of 03:27, 19 March 2012
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	Details reference [~~tronixstuff.com~~ http://tronixstuff.wordpress.com/2010/04/30/getting-started-with-arduino-%E2%80%93-chapter-four/]		Details reference [http://tronixstuff.wordpress.com/2010/04/30/getting-started-with-arduino-%E2%80%93-chapter-four/ tronixstuff.com]

2012-03-19T03:26:59Z

← Older revision		Revision as of 03:26, 19 March 2012
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	http://tronixstuff.wordpress.com		http://tronixstuff.wordpress.com
	*/		*/

	int latchpin = 8; // connect to pin 12 on the '595		int latchpin = 8; // connect to pin 12 on the '595
	int clockpin = 12; // connect to pin 11 on the '595		int clockpin = 12; // connect to pin 11 on the '595
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	int e = 0;		int e = 0;
	int speed = 300; // used to control speed of counting		int speed = 300; // used to control speed of counting

	int segdisp[10] = {		int segdisp[10] = {
	3,159,37,13,153,73,65,27,1,9 };		3,159,37,13,153,73,65,27,1,9 };

	void setup()		void setup()
	{		{
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	shiftOut(datapin, clockpin, LSBFIRST, 0); // clears the left display		shiftOut(datapin, clockpin, LSBFIRST, 0); // clears the left display
	digitalWrite(latchpin, HIGH);		digitalWrite(latchpin, HIGH);

	if (z<10)		if (z<10)
	{		{
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	}		}
	delay(2000);		delay(2000);


	// Count down		// Count down
	for (int z=99; z>=0; z--)		for (int z=99; z>=0; z--)
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	shiftOut(datapin, clockpin, LSBFIRST, 0); // clears the left display		shiftOut(datapin, clockpin, LSBFIRST, 0); // clears the left display
	digitalWrite(latchpin, HIGH);		digitalWrite(latchpin, HIGH);

	if (z<10)		if (z<10)
	{		{

2012-03-19T03:25:51Z

2012-03-19T02:53:17Z

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