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Open-Source Arm Puts Robotics Within Reach

In November 2020, we confirmed you [Chris Annin]’s open-source 6-DOF robotic arm. Since then he’s been making improvements to the arm and making it extra out there for any individual who doesn’t get to play with commercial robots all day at paintings. The largest growth is that AR2 had a closed-loop keep an eye on device, and AR3 is open-loop. If one thing bumps the arm or it crashes, the bot will recuperate its earlier place routinely. It additionally auto-calibrates itself the use of restrict switches.

AR3 is designed to be milled from aluminium or fully three-D published. The motors and encoders are managed with a Teensy 3.5, whilst an Arduino Mega handles I/O, the grippers, and the servos. In the demo video after the damage, [Chris] displays off AR3’s spectacular keep an eye on after a temporary robot ballet wherein two AR3s transfer in hypnotizing unison.

[Chris] arrange a web page with the code, his keep an eye on tool, and all of the STL recordsdata. He additionally has educational movies for programming and calibrating, and wrote an especially detailed meeting handbook. Between the web page and the neighborhood already in position from AR2, any individual with sufficient time, cash and backbone may just almost certainly construct one. Check out [Chris]’ playlist of AR2 builds — persons are the use of them for pictures, welding, and serving ice cream. Did you construct an AR2? The just right information is that AR3 is totally backward-compatible.

The AR3’s grippers paintings neatly, as you’ll see within the video. If you want a softer contact, check out emulating an octopus tentacle.

Thanks for the top, [Andrew]!