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Connecting the Pixy to a FriendlyARM board using I2C

Pixy Hardware
#1

Hi everyone,

We are trying to hook the Pixy (fw 0.1.43) to a FriendlyARM board (mini210s) using a hand-crafted I2C cable.

Our cable connects the pins 9, 5 and 8 of the the Pixy’s I/O connector to the relevant pins of our board. We then plugged the Pixy to a computer running the latest PixyMon (0.1.49 / OS X) and taught it two colors and changed the data output port to 1 in PixyMon’s settings (for I2C output).
Finally we detached it from PixyMon and tried to interact with it from our board (which is running Linux).

i2cdetect from i2c-tools does not find anything at 0x54 and we don’t manage to interact with the Pixy from hand-written C or Python programs.

Any idea what we are missing?

Thanks!

#2

Hi Thomas,

It seems like you have things connected correctly. Have you tried verifying the I2C communication using an Arduino? You can find instructions “here”:http://cmucam.org/projects/cmucam5/wiki/Hooking_up_Pixy_to_a_Microcontroller_like_an_Arduino#I2C.

Let me know what you find.

Scott

#3

Also be sure you’re running the “default program”… (if you’re running the “pan/tilt demo” or are in “raw” or “cooked” modes, no data will be streamed.)