Compact AVR ISP pogo adapter

Building an ISP adapter with short stroke pogo pins designed to be small and accurately positionable

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I came across these very small pogo pins by Mill-Max, specifically the 0906-0-15-20-76-14-11-0. These are only 0.2" / 5.0 mm long in total and feature a short stroke of 0.039" / 1.0 mm. 

Other AVR ISP adapter with pogo pins feature long pins and look difficult to position and solder, but I haven't used any of them so maybe they are simple to use. But as I think with these very short pogo pins it will be very easy to position, I designed an adapter featuring these.

To make positioning even easier I added alignment marks to the outer edge which can match up with marks on a ISP header footprint. I tested one of the pogo pins on a regular TH header footprint with 0.04" / 1.02 mm drills which connects great so I'll probably use a modified header footprint with alignment marks on a future board to test better. Also since I forget every time which direction to connect the ISP cable, I added arrows to indicate that, but it should be obvious since you want to see the pogo pins to align.

A regular TH 2x3 2.54 mm header is on the top which connects to the ISP cable, and the pogo pins are on the bottom side.

Read the latest log for more info and photos.

Image of pogo pin from Farnell.

  • New boards are in!

    Bastiaan12/18/2017 at 16:12 0 comments

    With the lovely help of @oshpark my 0.8 mm boards came in on a record time so I've already been able to solder the new boards.

    The thickness of the PCBs leaves a good amount of the pogo pin sticking out, but still it was not easy to solder the small pogo pins, simply because they should not be crooked. I pushed in the pin while soldering so they were pressed flat onto the board, but some jig to put in the pins and place the board on top should make it much easier. 

    I haven't been able to test programming a board since I don't have any without headers soldered onto it already, but a continuity test showed no problems. With a programming cable connected you have quite a good grip on it, and since the pogo pins are very short they are easy to align. It came out like I hoped so I'm happy with the result. Below are some photos of the board during soldering and the final result.

  • First version of boards are in and ...

    Bastiaan12/01/2017 at 16:33 0 comments

    I forgot to order on 0.8mm service of OSH Park. The through hole pin of the pogo is 1.75 mm, so it's not possible to solder it with a 1.6 mm PCB. However, the drill diameter is perfect and the alignment marks are printed right up to the edge so I'm happy with that. I'll post some pictures in a few days.

    Ordered the boards again on 0.8 mm, so that'll take a while. Thanks @oshpark for making it possible to order these ridiculously small boards with no extra costs. I promise to order a bit larger boards soon :)

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