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Modifications to Robot Arm for Opto Coupler Feedback, OWI 535, Edge etc
Easy prototype breadboard unit with DUAL PSU's and less then $10
Hi, I've owned an OWI kit for some time and felt there was some great potential if only it could be interfaced to a microcontroller. I wasn't happy with some suggestions which mounted external potentiometers and didn't take it any further. I then stumbled across your post which provided the inspiration I needed to give it a go. The only change I made was to incorporate the pull-up and in-line resistors inside the gearbox to tidy things up (although it is tight in there!). The next step was to interface this with an Arduino Mega which included building a shield with a couple of quad h-bridge drivers to run the motors.The real fun was then interface this with a PC where I used wrote a sketch using Processing which included an animated 3D model of the robot arm. The only shortcoming I found with this project was even using the Arduino's external interrupt feature to count pulses, it doesn't grab every one resulting in inaccuracies. To overcome this I included a calibrate feature in the Processing sketch where the user points the arm vertically and then clicking a button resets the pulse counts.In the end, without your blog I would never have embarked on this project and learnt all I have about Arduino and Processing - Thank you!
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