hi Mathew, on the Arduino Flora Board i run the LED.ino sketch of the MultiWii code. i changed the code to make it compatible with a neopixel ring (instead of the DFRobot LED ring). Everything works fine when i used the Flora Board and an Arduino Pro Mini. With the python example i have the same problem, maybe the I2C bus frequency of the RPI2 is not compatible with the arduino, i’ll try to change it, i let you know
uint8_t data[7] = {‘x’, ‘y’, ‘w’, ‘v’, ‘u’, ‘t’, ‘s’};
data corresponds to the different MultiWii modes: ACRO HORIZON GPS etc.
// Motors on - ACRO mode - blink 3 red 2x3 white 3 blue
//b[0]= 'x';
// Motors on - HORIZON mode -
//b[0]= 'y';
// Motors on - GPS Positi,on Hold mode - blink all blue
//b[0]= 'w';
// Motors on - GPS RTH mode - constant blue
//b[0]= 'v';
// Motors on - Angle mode - constant 4 red 2x4 white 4 blue
//b[0]= 'u';
// Motors off - Uncalibrated acc / not level- green blink
//b[0]= 't';`