EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: golash on March 20, 2015, 02:08:38 am
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Hi All
I'm just starting out in electronics and found this great video.
https://www.youtube.com/watch?v=QEFW4DcyOC0 (https://www.youtube.com/watch?v=QEFW4DcyOC0)
I would like to find a kit I could build similar to the video but with
8 segment display for the binary and the whole numbers. The 8 segment
option seems more elegant than LED's.
I did a search but didn't find anything.
Thanks
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Hi All
I'm just starting out in electronics and found this great video.
https://www.youtube.com/watch?v=QEFW4DcyOC0 (https://www.youtube.com/watch?v=QEFW4DcyOC0)
I would like to find a kit I could build similar to the video but with
8 segment display for the binary and the whole numbers. The 8 segment
option seems more elegant than LED's.
I did a search but didn't find anything.
Thanks
You probably meant 7 segment display?
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You may be jumping ahead of yourself a little.
Get the binary counter working first - so you get the idea of bits, 2^n and ripple counters.
To add a 7(8) segment LED will simply give you four blinking LED segments without any 'digits' displayed.
(They're just different shaped LEDs!) - or you can spend $ on a digit with decoding built-in....
Your next step may be understanding the various methods to decode the 4-bit binary into the LED 7-segment positions...
This could be a BCD to 7-segment decoder chip, or perhaps a diode array to light the appropriate segments for each digit's shape. The diode array is a better idea for learning - as it will teach you a lot more about the underlying electronics and logic than buying a black chip.
(Keep an eye on the current capability of the various outputs!)
Also you have to decide how you want to drive the LED segments (Common Anode or Common Cathode) - which in turn will define how you select, drive & connect up the LED 'decoder'.
Simply - ONE DIGIT:
4-bit counter
BCD to 7-segment decoder
7-segment LED display
Then you can choose how to cycle between 0-F (hex), or restrict the counting range to 0-9 (decimal)...
There's always more than one way, and even more things you can add later...
Once all the above is working - swap out the discrete 4-bit counter for a single TTL 74-series chip...
or the countr and decoder for a CMOS 40xx chip... (no numbers - you have to find them !)
EDIT: Just found this page - explains a lot for you:
COUNTERS: http://www.electronics-tutorials.ws/counter/count_1.html (http://www.electronics-tutorials.ws/counter/count_1.html)
DECODE & DISPLAY: http://www.electronics-tutorials.ws/combination/comb_6.html (http://www.electronics-tutorials.ws/combination/comb_6.html)
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Well, 7 Segment + DP
There are heaps of kits out there for this kind of thing, literally 100's. What country are you in?
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Hi
Thanks for the great explanation-SL4P. I'm in the US.