sure. i first put on the newest image from the product page. i put the Rainbow_CMD_V2_0 image onto the rainbowduino via mega-isp on a seeeduino.
then i uploaded the SeeedMaster to a seeeduino. I attached the I2C pins like below
analog 4 to the pin farthest from the power rails
analog 5 the next pin
ground the next pin
5v the next pin
so i have 4 pins left between the power rail and the already plugged in 4 pins.
after that, i just gave it all power and the seeedmaster already cycles through the some letters.
for a closeup of the connection
the “fix” was for my rainbowduino not displaying the programming properly. it no longer just does random bars. i just did touch up solders on all the legs of the ICs and all the ends of the surface mount stuff, and also the logs the female headers are in. (so basically, everything soldered to the board, i just heated it up to make it flow again just to verify it has connection)
i still am unable to upload the firmware with UartSB or the method posted in the blog because i get the issue of mismatched type.
i can however edit the code i want on the rainbowduino, and try to upload it with the arduino ide, and it fails, but it gives me the compiled hex file that i can then upload with avrdude and my mega-isp seeeduino.