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'7 segment pins ..'
1997\08\04@033814 by TUMER ARiF

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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

1997\08\04@042554 by avrbasic

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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





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1997\08\04@042554 by avrbasic

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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.

1997\08\04@091633 by Byron A Jeff

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>
> 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

1997\08\04@091633 by Byron A Jeff

face picon face
>
> 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

1997\08\05@085926 by paulb

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face
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.

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