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  • Modifications to Robot Arm for Opto Coupler Feedback, OWI 535, Edge etc

    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 foun...

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    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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