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Made custom servos for pixy, and a ball follower

Pixy Hardware
#1

Hi,
We needed position feedback from servos, so we built custom ones using an arduino to connect with Pixy and the motors. Here is the resulting prototype: https://www.youtube.com/watch?v=7_IZb0RJN_U

Next, we connected the arduino and Pixy to a Lego EV3 robot, and here is a simple ball follower: EDIT(corrected link): https://www.youtube.com/watch?v=HV3fGbYESYo

Thanks for the pixy, great product!
Adam

#2

Hello Adam,
This is really great! I also found this video:

thank you so much for sharing!

Can you describe how you interfaced to LEGO?

Edward

#3

Thanks!

And thanks for correcting the link.

In this robot, signals from the pixy are going first to the Arduino over SPI, and then the arduino sends data to EV3 over I2C using a modified lego cable. There is tutorial over at dexter industries that shows how to modify the cable: http://www.dexterindustries.com/howto/connect-the-arduino-and-the-lego-mindstorms-together/. It just needs two pull-up resistors between SDA and 5V and SCL and 5V lines.

The same cable can be used to connect the Pixy directly to EV3 (or NXT) lego brick, but we needed information on position and size of the blob on the arduino to direct the servos.

Adam

#4

thank you again!