Multi digit BCD to LED circuit

Thread Starter

Craig Tull

Joined Jan 17, 2012
13
I am in need of a bcd to multi diget seven segment circuit to give me a readout of a 5 bit bcd input (00-31) I can find all kinds of counter circuits but nothing to directly convert 5 bit bcd into a two digit display.
Thanks
Craig
 

spinnaker

Joined Oct 29, 2009
7,837
And there are BCD to 7 Segment display drivers out there.

But you need to know if your display is common anode to common cathode.
 

crutschow

Joined Mar 14, 2008
23,506
A BCD value of 31 requires 6 bits (four to represent 0-9 of the one's digit, and two to represent 0-3 of the ten's digit) so you apparently have a 5-bit binary number, not a BCD number. A binary number cannot be easily turned into BCD with simple logic. For that you need a binary to BCD conversion circuit and then a BCD display driver.
 

Thread Starter

Craig Tull

Joined Jan 17, 2012
13
Yes I guess it is just binary 00= 00000 and 31= 11111, sorry, I just can't understand with a bazillion chips out there....
 

Thread Starter

Craig Tull

Joined Jan 17, 2012
13
Mike that looks like it would be perfect, unfortunately I am not much on writing code. I am much better at implementation than design.
Craig
 

MMcLaren

Joined Feb 14, 2010
842
Modifying the code for your 5-bit binary to 2-digit decimal requirement is relatively easy. Do you have access to someone who can program the PIC device for you (you haven't included location information in your profile).

Regards, Mike
 

LDG

Joined Feb 10, 2012
4
I built this circuit ot aid in PIC chip programming.

if you are interested I can email you the HEX file for the
PIC16F870 microcontroller.
 

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