Hi,
I have had a Doomsday Clock Shield lying around for some time. Now I wanted to finally use it as a countdown clock. Unfortunately the page with the documentation, library download etc. is down.
Can anyone help me here? The Shield has already been a topic here several times.
Maybe send the library zip by PM?
Thanks!
BR Gene
I saw one mention of the display being "Charlieplexed". That means you have a bunch of pins, set all but two to pinMode(INPUT), one to OUTPUT and HIGH and one to OUTPUT and LOW and that will light one LED. Now you just have to figure out what pins they use and how the pairs map to your segments.
I think they use 9 pins which will Charlieplex 72 LEDs. If you include the six decimal points, the four 'colon' LEDs, and the 12 LEDs across the top, the display has 64 LEDs.
The LDR uses one analog pin and a place for an analog temperature sensor that would use another analog input. The optional rotary encoder probably uses two or three digital pins.
... the rotary encoder needs three inputs, then another output for the buzzer and A4 A5 for I2C is looped through.
Then I'll take the opportunity to trace all the circuit paths.
If you look at the fragments of the demo code, some interesting functions have been realised.
Let's wait and see, maybe someone still has the library at hand. It would save me some time - Christmas is inexorably approaching 
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