Charlieplexed LED Clock

65182Published On Feb 27,2010 01:11 AMshare2
One of my clocks stopped working – and it happened to be a clock my wife likes a lot. Went to the repair shop and the guy said that he didn’t have the spare parts and could not repair this. So – I thought – why not build an LED clock – I had tons of LEDs and an RTC module just waiting to be used.The original plan was to make a charlieplexed LED clock – 60 LEDs working off 9 pins and 12 LEDs working off 4 pins – so doable with a standalone arduino. This was to be powered off 4 AA cells.However, before the clock was finished – a couple of rolls of WS2812B RGB LED strips came – I had ordered these a couple of months ago – and they came at the perfect time. When my wife saw the effects that could be generated using these, there was no going back. Now, we had spent considerable amount of time sticking the charlie-plexed LEDs and soldering them – so I was unwilling to give them up. Finally, we used the white LEDs to show seconds, and a strip of 60 RGB LEDs for the minutes and hours.

Step by Step Introduction


Arduino Pro Mini 328 - 5V/16MHz
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Digital RGB LED Flexi-Strip 60 LED - 1 Meter
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Mini RTC Module
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USB to TTL Serial Cable - Debugger for Dev Board
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Wall Adapter Power Supply - 5VDC 2A
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