Hello. I am doing a project where i have to make a circuit that will allow me to adjust two 7-segment displays with two buttons. One button for increasing the number on the connected displays and one button for decreasing the number.

What components do i need and how do they need to be connected?

I don't know how to use programmable chips so don't suggest that please.

Any help will be appreciated

first look at the cd4029 ic
then look at these two circuits
the power supply circuit HAS the circuit your wanting to build. just figure out what to eliminate and combine from the two circuits.
pretty simple
Simple Digital Counter - doc00021


Electronics for You-Circuit Lab- Free and tested circuit diagrams-15-Step Digital Power Supply
good luck.
when you think you have a design then come on this forum and ask.
the great people on here don't design from the ground up but will help in avoiding smoke creating mistakes.

Thanks for replying. But i am not sure you have understood what i wanted to make.

The two buttons has to adjust the 7-segment display only by pressing the buttons. So if i press the up button it only goes 1 higher for every time i click it, and the same with the down button.

Alternatively it could work so that as long as i hold down the up button it counts up, and when i hold the down button it counts down, but when i'm not clicking any of the buttons it needs to stay at the number it's at.

Can i use the CD4029 ic for that?

Originally Posted by ericgibbs

hi,
If you want to drive 7seg displays from the up/down counter look at the CD40110 ic.
Its an up/dwn counter with inbuilt display drivers.

Datasheet Archive - Free Datasheet Search Engine - PDF Datasheets - Data Sheet - Datasheet - Application Note - Free Texas Instruments Samples

OK.?

Exactly what i need! Thank you so much. And thank you as well Sceadwian.

Hello again.
First i have a question. When the counter is on 9 and it goes one up does it go to 0 and sends a signal to carry, or does it keep counting to 15 and sends signal to carry when it resets at 16?

When I've got this set up I need to change the seven segment code from the outputs of the two CD40110, into digital code, so I can connect it to a DAC to get a voltage that changes up or down with the counter. Can i do this? Or do i need to get an IC similar to CD40110, that has a digital output instead of 7-segment?

My classmate has found another IC we could possibly use, but we aren't sure.

The IC is 74F193 (http://www.fairchildsemi.com/ds/74%2F74F193.pdf)
As far as we can understand it can do the same manual up down count as the CD40110 and it gives a digital output rather than a 7-segment code - but it says that it will change to 0 (and send signal through carry) after 15, and not after 9 as we want it to. Is it possible to make it change after 9 instead of after 15?

Hello again.
We decided to go with the 74LS192. But now we can't get it to work.
We have connected it like this:
Pins:
1, 9, 10, 12, 13, 14, 15 : nothing
2, 3, 6 & 7: BCD to 7 segment converter (74LS47)
4: Up counter button
5: Down counter button
8: Ground
11: Positive input
16: Positive input

Is this correct?

Also do i read the datasheet correctly, in thinking that the digital output goes one up or down every time one of the button inputs changes from high to low voltage? And that the other button input has to be on high when this change occurs?

Also if it needs to be done like just mentioned i have another question.
We have a button with a spring in it, so that when you push it down it closes the circuit, and then when u lift the finger it breaks the connection. But if we need the other input to be on positive we need the buttons to break the connection rather than closing it. Is it possible to do this with the buttons we have? Or do we need to get some buttons that break the circuit when pressed? And if so, what are they called?