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Need Help To Build 7 Segment LED Display Circuit

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iccool

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I had only little bit of knowledge of electronics. I had done some very small projects from circuits in books. I need a circuit that will display 5 digit display which uses 4" Seven Segment display (Please see the datasheet attached - KLS401I) that receives input from a 0-9 digit number pad (Individual Number Pad, not from PC).

I searched and found some ICs that can be used, please advice me which one can be used, if anyone can give a circuit that would he very helpful.
CD4511
CD4543
PIC 16F877
7447

I know PIC ICs had to be programmed, I like programming but don't know which IC to purchase and how to connect it to PC to program the IC. Read about PICAXE ICs, but not sure it is available in India or not. I would like to make it both ways, with a PIC IC and with a Pre-programmed IC.

Also give me a idea how I can make the number pad input (not from PC) to IC. I read that CD4511 is a BCD CMOS IC, but how to give input to that IC?

Thanks in advance..
 

deepuj

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the schematic using a 7447 is pretty simple for a 7-segment display (https://web.mit.edu/6.s28/www/datasheets/DM74LS47.pdf). It takes in a 4 bit binary input and displays the digit on the LED display.

I think you should use the simplest PIC micro-controller available and program one port a a keypad and the rest as the binary outputs (you can use just 3 bits of a port for the keypad and the rest of the 5 bits for two displays by multiplexing... but it makes things more complex).

PIC micro-controllers are easily available in India.
 

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