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query regarding seven segment display

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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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priya123

Thu May 08 2008, 06:23PM

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sir , i am using seven segment display for my project, actually i am not much familiar with the seven-segment-display,i just want to know its configuration,now it operates,i hv to connect this 7-segment display to port1 of mymicrocontroller .i am designing the circuit on a breadboard,so please helpmehow toconnect this 7-segment display as i am verynew to it.

abbas1707

Thu May 08 2008, 08:33PM

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http://www.iguanalabs.com/7segment.htm
http://esd.cs.ucr.edu/labs/dec_counter/dec_counter.html

A Thousand Miles Journey Starts With a Single Step.

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Shailesh NAYAK

Thu May 08 2008, 08:39PM

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Hi,
Please ensure your seven segment display is common cathode or common anode
since Seven segment display is nothing but bunch of LED's, which are available in either common anode or common cathode.

http://www.hobbyprojects.com/the_diode/seven_segment_display.html

Best Regards

Shailesh S. NAYAK

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priya123

pdi33

Fri May 09 2008, 04:26AM

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priya,
please mention the part no. of ur LED display that u are going to use so that we can determine the connection ciruit required by u. listed below are sone part no.s and description:
LT542 : common anode single digit display (0.56")
LT543 : common cathode single digit display (0.56")
HP5501 : common anode single digit display (0.53")
HP5503 : common cathode single digit display (0.53")
KLS51 : common anode single digit display (0.5")

the alphabets may change depending upon the manufacturer e.g. LT542 is from Liton and VT542 is from visiontek.

In addition, u also get an internally multiplexed 2/3/4 digit displays where the segments are internally connected and u get the shorted eight segment pins and the common anode/cathode of each digit.

* inspired to develop,developing to inspire *

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priya123

priya123

Sun May 11 2008, 06:11PM

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sir, the part number of my LED(7 segment display) is SP5503. please provide me the details of this chip and its connection procedure. thanking u.

Arun Kumar V

Sun May 11 2008, 07:15PM

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Hello priya123,

i am Shocked to find that you are writing program to connect 7-seg display without knowing how to test a 7-seg display ?

use some elementary tools like "multimeter" to find the type of display.

SP5503 - is a common cathode display which you should avoid in this project

SP5501 - is a common anode display which you should use here.

most of the single 7 seg- displays have 10 pins (5 up /5 down or 5 Left side or 5 right side) pin 3 and pin

8 are common ( to be connected to GND or V+ depending on the type).

on your Digital multimeter select the Diode test range and connect the red probe (+) of your meter to pin 3 or pin 8 and connect black (-) probe to other pins one by one - check if the segments glow -if it glows then you have a Common anode type

now connect black probe to pin 3 or pin 8 and touch the red probe to other pins, if the segs glow then you have a Common cathode type.

I feel embarrased to tell you these primitive things

These are the basics you should have known when you have reached this far

next you might ask how to test a Transistor ?

Arun

pdi33

Mon May 12 2008, 12:57AM

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check this link. it will provide u detailed pin description of various LED displays.
http://www.kwalityindia.com/main.html
the display u are using is the 0.5" common cathode display (KLS5XX equivalent of kwality phototronics.).
u will also get more info from that site. Try to understand the principle first before going ahead.
Good Luck.

* inspired to develop,developing to inspire *

priya123

Mon May 12 2008, 04:54PM

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sir,in the last post i asked u a very silly question,actually i was not able to express my doubt properly,by connection procedure i wanted to mean the pin configuration of the chip SP5503. I know its a commom cathode chip,so i have changed my programming also. i am trying a lot to find its pin configuration,but i am unable to do so.so,please give me the pin configuration of this chip.please send a quick reply,
thanking u,

priya123

Mon May 12 2008, 09:30PM

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for my project as i am using common cathode 7-segment display,i have sent these values .please tell me whether these are the correct values
hex no . 7-segment equivalent
0 --------------------- 3f
1 ------------------------ 06
2 -------------------------- 5b
3 ----------------------------- 4f
4 ------------------------------------ 66
5 ------------------------------------- 6d
6 --------------------------------------- 7d
7 ----------------------------- 07
8 -------------------------------- 7f
9 ---------------------------------- 67

[ Edited Tue May 13 2008, 03:55PM ]

pdi33

Tue May 13 2008, 12:47AM

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hi priya, seems u have not read my previous post carefully. I have given a link to a page which contains the pin description of the LED displays.Just check the pin description of KLS5XX series which is same as ur SP5503. here is the link again

http://www.kwalityindia.com/main.html

regarding the hex values, well it totally depend upon how u are connecting the individual segments to the port pins like say segment a to port 0.0, segment b to port0.1...etc. U will have to give us that data as well for us to verify if ur hex table is correct.

* inspired to develop,developing to inspire *