Sending Data from Arduino to TouchDesigner

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Follow this tutorial if you're having trouble getting the Arduino and Touchdesigner to talk to each other.

This tutorial follows the instructions provided on Derivative's wiki:
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Thank for this awesome tutorial, it's so useful! I have a problem that I cant solve: I am using a knob in Arduino, and I just want to send the number that is shown in the serial monitor to the radius attribute of a circle. I've used a Dat to CHOP, and a Math CHOP after that. Then I drag the channel to the radious atribute of a Circlr TOP, but it gives an error saying that float() must be a string or a number. I thought it was already a number because it went through the Math CHOP, but I cant solve this. Hope anyone can help me! :)

PabloLucio