Post by thread:7 segment pins ..

Please urgent help . This is a foolish question and nothing to do about pics but it is vital . What is the pin diagrams of a 7 segment cathod display . I mean HOW IS IT USED ?? . 5 volts to 100 ohms and then A-B-C .. etc but which pins are A-B-C .. . Please urgent help . I use HDSP 5503

At 10:37 AM 4/8/97 +0300, you wrote: >Please urgent help . This is a foolish question and nothing to do about >pics but it is vital . What is the pin diagrams of a 7 segment cathod >display . I mean HOW IS IT USED ?? . 5 volts to 100 ohms and then A-B-C .. >etc but which pins are A-B-C .. . Please urgent help . I use HDSP 5503 10 9 8 7 6 1 2 3 4 5 1 e 2 d 3 common cathode 4 c 5 DP (decimal point) 6 b 7 a 8 common cathode (connected to 3) 9 f 10 g /antti No Limits Go To Basics of AVR AVR AVRBASIC http://www.avrbasic.com Born for Basic Grand opening in August. Watch out for first week offers.

> > Please urgent help . This is a foolish question and nothing to do about > pics but it is vital . What is the pin diagrams of a 7 segment cathod > display . I mean HOW IS IT USED ?? . 5 volts to 100 ohms and then A-B-C .. > etc but which pins are A-B-C .. . Please urgent help . I use HDSP 5503 > For testing I'd proably stick for 220 ohms. You really can't hurt an LED by reverse biasing it with low current. So simply rig up a probe with the current limited +5 and ground and start poking on the display. Very quickly something will light up. Since it's common cathode the ground pin will then stay put. Use the CL +5 line to figure out the other segments. Segments are normally labelled: a |---| f| |b | g | ----- | | e| | c ----- d Hope this helps. This is one task where you really don't need a pinout. BAJ

Byron A Jeff wrote: > You really can't hurt an LED by reverse biasing it with low current. Oh, I wouldn't bet on that! If you meant to say: "You really can't hurt an LED by reverse biasing it with low voltage (5V or less)." ... then I would be happy. My experience suggests that LEDs HATE being reverse biased into breakdown. > Hope this helps. This is one task where you really don't need a > pinout. Fine! Cheers, Paul B.