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Picture of 7-Segment-Display
I want to show you in this "Instructable" how to control 7-Segment-Display

What you need:
  *Arduino Duemilanove
  *a lot of 7-Segment-Display
  *a lot of push Button
  *a potentiometer
  *8 x 120 Ohm resistor
  *4 x 1k2 Ohm resistor
  *2 x 1k Ohm resistor
  *4 x BC547 Transistor
  *1 x 74HC595
  *breadboard
  *wire

Step 1: 7-Segment displaying with potentiometer

Picture of 7-Segment displaying with potentiometer
Unbenannt2.jpg
On this step i worked with a shiftregister (74HC595). I connected the pins of 7-Segment to the shiftregister(a-g -> Q0, Q6). And a potentiometer to displaying the characters. Down here you can see the schematic.

latchPin = 8;     // pin 12 on the 74hc595
clockPin = 12;  // pin 11 on the 74hc595
dataPin = 11;   // pin 14 on the 74hc595

And you can download the Programm Code
 
saidesai215 months ago

in step 2 program is not compiling its showing error like

"sketch_mar24a.ino:1:22: fatal error: Debounce.h: No such file or directory

compilation terminated."

Outrange5 months ago
hi there :) i want to build your 2 buttons up/down counter but here is the deal that i dont know where i will put the resistors :( can you help me please ? :/

thank you
mertaxoy (author)  Outrange5 months ago

hi, try it without resistor, if you get problem, just try it like the attached picture..

arduino_button-pullup.jpg
Outrange mertaxoy5 months ago
thank you for everything
Outrange Outrange5 months ago
actually i have tried it today without resistor and nothing happened :/ what should i see when i connected it to the arduino and computer ? code works but no response from the breadboard :/
dsmmoore1 year ago
I am looking to do a similar project but wish to use a 4 digit display and have each count up/down be by 0.1 therefore it could count like so 9.90, 10.00, 10.10, etc. How can I modify your code to do this?
Naterenfo2 years ago
Hey there Mertaxoy,
I am just getting started with Arduino programming, and I am copying your example as displayed here. Why do I get the feeling that if I press one of these buttons its going to short out? Am I missing something here? the way you have it wired on your Fritzing diagram appears that when the button is pushed, the 3.3v would go straight to ground...? are the ground wires supposed to go to the other side of the buttons, with pull down resistors?
mertaxoy (author)  Naterenfo2 years ago
hi Naterenfo,
you need certainly the pull down resistors for 3,3V
Nifty!

What about a 2 digit potentiometer controlled version?
mertaxoy (author)  lemonhead_oo72 years ago
its possible :)
is that arduino avalaible in the market easily??
mertaxoy (author)  Daniyal Khan3 years ago
yes, is it !

http://www.ebay.com/itm/Arduino-UNO-2011-Version-ATMEGA328P-PU-AVR-MCU-Board-USB2-0-Cable-/180833433758?pt=LH_DefaultDomain_0&hash=item2a1a83389e
kyubok4 years ago
can u help me?,, how to program a 2 digit 7segment display, for count up and count down.... pls.. guide me...
mertaxoy (author)  kyubok4 years ago
so İ have added the 3th step for you pleas take a look at it ;)
feel free to ask me anything..
mailman00014 years ago
How come it's not counting up or down? All of leds are off except the middle bar (g) and when I push ether one of the push buttons it cut off and back on once released. I even tried wiring a-g with 3V or 5V (high). Is there something else I maybe missing that's not in picture ( Count down and up with 2 push buttons)?
mertaxoy (author)  mailman00014 years ago
i think i forgot the pull up resistors from buttons to ground... (1kOHM)...
mailman00014 years ago
And I'm using the Arduino Uno by the way! This shouldn't make a difference,should it ?
mertaxoy (author)  mailman00014 years ago
no, it shouldn't...
mailman00014 years ago
what kind of 7 segment do you used for this project?
mertaxoy (author)  mailman00014 years ago
common cathode - http://www.conrad.at/ce/de/product/160172/7-SEGMENTANZEIGE-14-MM-A/SHOP_AREA_17651&promotionareaSearchDetail=005