gnupic: Re: [gnupic] sanity check, pic12f675 first project
Subject:
Re: [gnupic] sanity check, pic12f675 first project
From:
Peter Stuge ####@####.####
Date:
22 Jul 2009 02:04:49 -0000
Message-Id: <20090722020420.26338.qmail@stuge.se>
Jason wrote:
> Nice. I found a circuit a while back [1] for increasing the LED
> brightness by pulsing it. I thought I'd replace the 555 timer with
> a more flexible pic...
Aha. Watch out with the voltage though - that circuit will make those
R2-R3 resistors sweat a bit, and the Q1 transistor will also be a bit
stressed.
Better match the supply voltage to the forward voltage of your LEDs,
then there's no extra voltage that needs to be dropped by other
components.
Jason wrote:
> > Set up your circuit for ICSP as soon as possible. No reason to
> > be plugging chips into ZIF sockets for programming anymore.
>
> Very true. I'll program it that way on my breadboard, then make
> sure to add traces when I move to PCB. The crux of it seems to be
> connecting the trace to the pin before any components (typically
> resistors).
Problem is that the application circuit can easily interfere with
ICSP. If I can, I make sure to leave the ICSP pins unconnected.
If I can't, I tend to program the PIC out of circuit.
//Peter
