Alain - are you posing your questions to me or to Ramius? This thread was started by me so I don't know what you mean by 'false'. The PAUSEs (approx. 1.5 secs while LED is high, 0.5 secs while low) are the whole point of the circuit - I'm using a PIC to create blinking lights which match an existing model.

Here's the schematic:



Both PICs are programmed with the same code. For about a minute or so after connecting the power, they both blink their LEDs at the same time but slowly get out of sync (one starts flashing before the other) after about 1.5 minutes. Since I'm trying to create EXACT on/off timings, it looks like if I use a transistor (which I need to do as this circuit will light 4 white LEDs) then I have to do this by trial and error rather than relying on the values in the PAUSE command.