to show 0 to 99 to 7 segment display

How to show 8 bit binary number to 7 segment bcd display ????

How to show 8 bit binary number to 7 segment bcd display ????

How to show 8 bit binary number to 7 segment bcd display ????

There are lots of BCD to 7-segment decoder/driver chips. 7447 and CD4511 come to mind. Search Digikey and Mouser for part numbers. HTH

-Dave Pollum

TIL311, one of my favorite parts from the days when I did all designs in TTL. It includes latch, decoder, drivers, and LEDS, and displays 0- F from 4-bit input and has right and left decimal points as well. Now made by Taos and available from Mouser.

A TIL-311 looks really great, but it's very expensive. Mouser's price on the TIL311 is $26.82 (qty 1-9) and $23.47 (qty 10-24). Ouch!

-Dave Pollum

They were equivalently expensive back when we used them in the 80's (about $7 as I recall). But since they included the leds, current limit resistors, latch and decoder in the space of a DIP package, they were a bargain in some applications.

schreef in bericht news: snipped-for-privacy@l53g2000cwa.googlegroups.com...

An eight bit binary number ranges from 0 to 255 (decimal) so you will need three 7-segment diplays to show the eight bits number in BCD.

There are some solutions but as you didn't give any constraints it's hard to tell which one will suit you.

If you need one off and space is not a problem, a quick and dirty solution is programming three old EPROMs like the infamous 2764. As maybe the EPROMs cannot provide enough power to drive the LEDs of the display you may have to put drivers or transistors between the EPROMs and the displays.

Likewise you can use GALs although you may run into a fitting problem.

You can go for a two stage solution. Use EPROMs or GALs to convert from binary to BCD and standard BCD to 7-segment decoders/drivers, like the CD4511, to convert BCD to display.

You can program a PIC16F870 or similar for the conversion and multiplexing of the three displays.

The biggest solution I can think about is a PC with an EPP or other bidirectional parallel port. Read the eight bits from the port and display the number on the screen. An old DOS machine and one line in GWBASIC will do the trick.

(You can use a mainframe as well but I expect real space and power problems in that case.)

petrus bitbyter

And they're hex displays, i.e. 1 2 3 4 5 6 7 8 9 a b c d e f.

The OP asked for BCD.

I've already given him (or her or it) the answer - OP needs some way to get BCD out of binary, and OP'll need 3 digits of display, from

But posting the same message seventeen times in two days shows the guy really has no clue in the first place. What's up with these google groupies? Do they think they can just post their homework questions and have answers magically appear on their desk?

Feh. Rich

--- Load the 8 bit number into an 8 bit binary down counter while at the same time clearing four cascaded BCD up counters.

Start both counters and use the same clock for both of them.

When the binary counter gets to zero stop both counters.

The BCD counter chain will now have as its output the BCD equivalent of the 8 bit number loaded into the binary counter.

Connect the outputs of the BCD counters to your favorite BCD to 7 segment decoders and connect their outputs (through resistors) to your favorite 7 segment displays.

Voila! Binary to decimal converter and display...

-- JF

Make that 3 BCD counters, and better yet make them CD4033s.