Slide a small piece of heat shrink tubing onto the red wire, then strip the end and solder to the corner pin on the socket as shown.

Slide the heat shrink over the joint and shrink with a heat gun.

Repeat with the black alligator clip at the other corner pin.
It doesn't really matter what color goes where, but for clarity and consistency you may want to do like we do.

Tin all the rest of the pins and prep the alligator clips by stripping and tinning the ends of the wires and sliding on small pieces of heat shrink tubing.

Solder on the wires and shrink the heat shrink. Double check the wires are all insulated and connected securely, then cinch them together with a zip tie.
These photos better illustrate which color wire is attached to each pin.
Power GEMMA over USB or with a battery and be sure the USBtinyISP's jumper is NOT in place.

Attach the alligator clips to GEMMA as shown:
Black wire -> GND
Red wire -> 3Vo
Blue wire -> A1/D2 (SCL/SCK)
White wire -> D0 (SDA/MOSI)
Green wire -> D1 (MISO)

Then connect the cable squid to the USBtinyISP. The plug will only fit in one direction.
Flip GEMMA over and hold the yellow clip to the reset pad on the back. Get comfortable-- you will have to hold it firmly during the flashing process, which is shorter than FLORA's since the bootloader is a smaller size.
Select Adafruit Gemma 8MHz from the Boards menu.
Select USBtinyISP from the Programmer menu.
Hold the yellow clip to the reset pin and click Burn Bootloader from the Tools menu. Don't let go until the status reads Done burning bootloader. You're done, congrats!

This guide was first published on Jul 08, 2014. It was last updated on Jul 08, 2014.

This page (Reprogram GEMMA over ICSP) was last updated on Oct 28, 2020.

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