Hi Clocks,

Any particular reason you are using LEDs instead of an LCD? Have you seen the data sheet for the 4511? You can do all 4 displays with 1-4511 and the SEG 1-4 pins would then go to transistors to drive the ground pins on the displays. Microchip has an application note showing how to make a clock using just the displays connected directly to the PIC. You might want to check it out.

I have a clock product that I make that uses the Maxim DS1337 clock chip that has 2 alarm outputs. I don't have a fixed display on the product but when I need to check to make sure all is well with it, I plug a serial display onto the board. 4 PIC pins to the clock chip and 1 pin to the display.

There have been quite a few clock programs on this forum over the past few years. You might want to do a search for them and also look at the Microchip site (www.microchip.com) for the app note on the clock.

I must be honest with you though, I have never built a clock with LED displays but I can provide you with some guidance and if I can't help you there are many great people on the forum here that probably can.

HTH,

BobK