I am keeping my head low with this post
but I have been asked to design a clock, preferably using a blank CD as the face ![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Well the idea is this, one outer row of 60 Led's, assuming they will all fit, (THINKS- This is going to be a big CD), and an inner row of 12 Blue LED's to represent the hours. Each outer LED will be bi-colour such that for the first 15 seconds it glows Green, then for the next 15 seconds it glows Yellow, then the next 15 seconds Red. Finally for the last 15 seconds it flashes Green before changing over to the next LED. I suppose using common cathode LED's would make it a bit easier, with the Cathode selecting the actual LED to be lit. The Green and Red wires of each LED going to two circular Bus Bars that control the actual colour displayed. The hardest part it seems is getting 60 individual decodes, any ideas? A long string of 4017's errrr there must be an easier way?
I think it would be a cute clock if it is possible to build even though its accuracy is only down to the nearest 15 seconds. But a good conversation piece for visitors. Maybe someone has already made one?
Les
Well the idea is this, one outer row of 60 Led's, assuming they will all fit, (THINKS- This is going to be a big CD), and an inner row of 12 Blue LED's to represent the hours. Each outer LED will be bi-colour such that for the first 15 seconds it glows Green, then for the next 15 seconds it glows Yellow, then the next 15 seconds Red. Finally for the last 15 seconds it flashes Green before changing over to the next LED. I suppose using common cathode LED's would make it a bit easier, with the Cathode selecting the actual LED to be lit. The Green and Red wires of each LED going to two circular Bus Bars that control the actual colour displayed. The hardest part it seems is getting 60 individual decodes, any ideas? A long string of 4017's errrr there must be an easier way?
I think it would be a cute clock if it is possible to build even though its accuracy is only down to the nearest 15 seconds. But a good conversation piece for visitors. Maybe someone has already made one?
Les