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

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

Comments

[lemonhead_oo7]

Nifty!

What about a 2 digit potentiometer controlled version?

[mertaxoy]

its possible :)

[Daniyal Khan]

is that arduino avalaible in the market easily??

[mertaxoy]

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

[kyubok]

can u help me?,, how to program a 2 digit 7segment display, for count up and count down.... pls.. guide me...

[mertaxoy]

so İ have added the 3th step for you pleas take a look at it ;)
feel free to ask me anything..

[mailman0001]

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]

i think i forgot the pull up resistors from buttons to ground... (1kOHM)...

[mailman0001]

And I'm using the Arduino Uno by the way! This shouldn't make a difference,should it ?

[mertaxoy]

no, it shouldn't...

[mailman0001]

what kind of 7 segment do you used for this project?

[mertaxoy]

common cathode - http://www.conrad.at/ce/de/product/160172/7-SEGMENTANZEIGE-14-MM-A/SHOP_AREA_17651&promotionareaSearchDetail=005