Building is built in O Scale (1/48) and has 40 rooms that are lighted independently (masked out from each other with walls) Rooms are lighted with White LEDs. The rooms will light one at a time (but in different areas of the building to make it appear random)until all 40 rooms are lighted. Than they will turn off in reverse order until all off and than the cycle repeats. A 555 is used as the clock with about a 5 second pulse rate so the complete cycle will be a little over 3 minutes. This is a large model building for my train club that has open houses for the public. Purpose of circuit is to make the building have a different look every time it catches your eye. The LEDs will be powered from 12 volts, the logic will be accomplished by the 555 as mentioned, along with recently purchased TLC5916 8 Channel LED Sink Drivers (5 of them cascaded to get 40 channels, 1 per building room)
I have had some success on a dual chip (16 bit) circuit on a breadboard but know it is not right as it requires a zener diode to make it work and when I tried to expand the circuit out to 5 cascaded chips on a production wire wrapped board it failed miserably.
I am pretty sure Pin 2 (SD1) and Pin 3 (CLK) need to be tied together on all five chips to Pin 3 of the 555 Timer. The question is than, what do I do with Pins 4 (LE(ED1), Pin 13 OE(ED2), PIN 14 (SDO) and I presume Pin 12 (OUT7) of the 5th Chip needs to get tied somewhere else besides the final 40th LED it drives to reset the circuit, but where and how? I am at a loss, have spent many hours and tried every combination of connections possible. Any ideas or schematics would be greatly appreciated!
TY in advance