This project is based on a Kingbright dual 7 segment display and an Arduino Diecimila. it counts down from 20 and lights up pin 13 LED when the timer is complete. It uses no extra hardware which is usefull for low-cost projects. It also features multiplexing to get the job done with only 9 pins altogether for the displays.
Step 1: Parts needed
For this project you will need the following:
COMPONENTS: 1. An Arduino (any kind will do) 2. A dual-7 segmant display or 2 seperate 7 segment displays. 3. 2 Resistors (the values depend on your display) 4. About 50cm of non-stranded wire
TOOLS: 1. A soldering iron and solder. (My display was SMD so i had to solder wires to it for connection) 2. A fume extractor. (I really reccomend buying or making one as they are very helpful to you) 3. A wire stripper, or you could just use scissors