I finished assembling my Bulbdial Clock but unfortunately it doesn't seem to work correctly. I seem to be having trouble with the LED1:1 and LED 2:1 signals. I get the following sequence of LEDs lighting when I try to manually step around the blue ring:

D14/D24
D14/D24
D34
D54
D64
D15/D25
D15/D25
D35
D45
D65
D16/D26
D16/D26
D36
D46
D56
nothing (should be D21)
D31/D32
D41/D42
D51/D52
D61/D62
nothing (should be D12)
D31/D32
D41/D42
D51/D52
D61/D62
D13/D23
D13/D23
D43
D53
D63

It seems like I can explain all of the double LEDs with a problem with D1:1 and D2:1 but I've checked the solder connections to those MPU pins and the circuits connected to them and can't find a problem. Anyone have any suggestions?

Thanks,
David Betz

Was it doing this before you added the second and third rings? Or, did this only start with the additional rings?

Sounds like you might have a short circuit between the LED1 and LED2 signals-- that would explain why it goes dark on the D12/D21.

I guess I've solved my problem. I looked over the blue board and noticed that a number of the leads for the LEDs touched the PCB where they were bent at a right angle. I pushed them away from the PCB a little and now all of the tests run without error. It seems that the LED leads can short against the board even though there is a solder mask on the board. Now I just need to align all of the LEDs and assemble the case. Thanks for your help.

>It seems that the LED leads can short against the board even though there is a solder mask on the board.

Yes, that's true: Solder mask is not uniform enough to rely on it as an insulator. I'm glad that you got it working.