Wednesday, July 16, 2008
PICkit 2 Cable
- Pin 1 on PICkit 2 goes to the center of the 3-pin connector.
- Pin 2 on PICkit 2 is unused. Power will come from the power supply not the PICKit 2.
- Pin 3 on PICkit 2 goes to the left pin of the 3-pin connector (left when "Max/Empty" is right-side up). This is a ground connection; follow the trace from the "-" to capacitor C4 to the empty hole by R6, flip the board over and trace it to the left pin.
- Pin 4 on PICkit 2 goes to pin 3 of 7. (Pin 1 on the board is square if your board doesn't have the numbers silkscreened on it. Pin 1 also is toward the center of the board.)
- Pin 5 on PICkit 2 goes to pin 4 of 7.
- Pin 6 on PICkit 2 is unused.
Why bother with the PICkit 2? It is a small USB device that is purchased complete. No assembly required. (Other than the in-circuit programming cable that I built above.) Why make the cable? I have a notebook computer and the USB port gives 4.75 volts not the reuired 5 volts, so I need to use my RepRap power supply. Furthermore, my notebook computer has no serial ports making a USB solution a necessity.
One more thing that I have to share with the community... Silver Sharpie markers are truely excellent for writing on PIC chips. I'm not going to recommend adding it to the miscellaneous list, but if you have one silver on black is really easy to read.
I can hear some diodes begging to be installed in some Universal Controller cards...