This the result of too much free time lately, the new project is a robot drawing a sphere, using the low-cost approach to the selection servos and other components, with a retractable arm that comes from inside through a gate and once inside collected no space and is also protected when not in use.
This is an area of 28 cm in diameter (11 inches) of PVC, is a large Christmas ball, once cut in half I've noticed that need structural refurzos to hold its shape once installed all the electronics and mechanics. So I will use sections of an empty roll of wire for reinforcement.
By R2D2
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Once again I must thank the producer of helicopters rc his great contribution to the world of robotics.
A roomba base is a great one as long as it meets what your looking for in size because they are fairly wide and thick, then you build onto them. Nice work with the claw, are you going to custom make an arm?
From ARC is easy servos move together and in the right direction for opening the gripper, but if you want to save a digital port and manage the two servos with a single digital port, can connect the two servos with a cable "Y" but the two servos would move in the same direction. We have to dismantle and exchange servo cables servo motor, and also swapping cables (both end) servo potentiometer. This I did in my robot eyebrows save RSP to a digital port, and works well.
Yes, Josh, the arm is customized to the size for inside the ball, reach down and manipulation height mentioned before. The width of the arm is just to fold the hand inside. The arm has elbow and wrist, elbow is moved by a servo s8166m that at the end of the rail opening arm, whereupon the arm is an aluminum empty, without the hand.
@R2D2 That is a very cool design approach. Can't wait to see this little guy in operation.
Also what you said about modifying the servo so one channel can drive two servos but in opposite directions is a neat idea. I had looked at buying a special converter from servo City to do this but it costs $39.99 + s/h. So I'm glad to hear that I can do this your way and save me some money.
Servo Reverser
Yet another great robot using everyday stuff. I love it!
Great work R2D2 !
Thanks guys, I try to stand in the gap and take advantage when I have time.
@ rgordon, Buy an inverter signal HobbyKing in very cheap ($ 2.14) but it never worked, and lost no time in claim.
Signal Reverser