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January 7, 2010
about 10 years ago
If you want to control more than 1 display, using an ICM7218 you'll need 10 pins from your microcontroller. Using I2C you can reduce the amount to only 2 pins for all the displays you want to control. I've written a post about it (with source code for Arduino): http://ardugonic.blogspot.com/2010/06/icm7218a-combined-with-pcf8574-to.html
And here is the post: http://ardugonic.blogspot.com/2010/05/driving-8-digits-7-segment-display-with.html
I've used an ICM7218A as IsotopeJ suggested and it works fine.
And combined with a PCF8574 you only need 2 pins from the Arduino to control 2 displays.
I hope next week I'll be able to make a post with the how-to and source code. Meanwhile, here is a video: http://www.youtube.com/user/ardugoblog#p/a/u/0/iO3DRslhQK0
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