G-OSD mod – adding programming pins (ISP)

This is my modification of G-OSD from HobbyKing.

Goal:
– Connect smaller and lighter Mediatek based gps module (GlobalTop Gms-u1LP) instead of stock big and heavy
– Make reprogramming easy.

Why smaller gps module? Because it’s smaller 🙂 , draw less current from battery and offer much more frequent position updates.
Here you can see how small is this module compared to provided with G-OSD:

g-osd's gps module vs small Mediatek module

Comparision of sizes between gps modules: stock g-osd (on right) versus GlobalTop Gms-u1LP (on left)

I saw few mods of G-OSD on Rcgroups but none of them fit my needs, most of them have additional side connector for programming and this makes module much larger.
I decided to extend original connector with few new pins. It occured to be quite easy job 🙂

At start you need to remove heatshrink wrap and plastic part between goldpins:

g-osd with plastic part between pins removed

g-osd with plastic part between pins removed

Prepare new, larger two rows golpin module (in my case 8×2 pins), remove from it pins already present in G-OSD:

g-osd ready to get new plastic with additional goldpins

g-osd ready to get new plastic with additional goldpins

Put plastic with additional pins on old pins:

g-osd - inserting additional pins

g-osd – inserting additional pins


g-osd with new pins attached

g-osd with new pins attached

I soldered 3.3V LDO voltage regulator (directly on pins) required to power new gps. I decided to put it into OSD instead of gps module because I had space there for it, one free pin and I’ll have possibility to connect this gps to other devices for other purposes. Connected rest of new golpins with programming pads of G-OSD using Kynar wires:

g-osd with wires for programming soldered to new pins

g-osd with wires for programming soldered to new pins


g-osd with wires soldered to programming pads

g-osd with wires soldered to programming pads

Put description of pins on the back of pcb and put all into new shrinkwrap:

g-osd modified and shrinkwrapped - top side

g-osd modified and shrinkwrapped – top side


g-osd modified and shrinkwrapped - bottom side

g-osd modified and shrinkwrapped – bottom side

That’s all. New G-OSD is ready to work with 3.3V gps and ready to get new firmware, for example CL-OSD

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