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I was hoping to see more of the "gotchas" about the vehicles themselves -- things to look for (good or bad), models that are more versatile or hackable than others.
Low Cost Reliable & Powerfull Laser Engraver
This is a very nice build. I know it's a lot of work making these instructables, even when English is your first language. So thank you for getting through it. I am excited to see more information as you add it. I already have some of these parts so I will try to get your parts printed and cut....
I wish you were my son's science teacher this year.I wish you had been mine, any year.(I guess you are, this year.)
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Nothing? ...You mean besides the step by step instructions in the video, and the ones in the description?
Nice. The Meccano brackets are a lot more rigid. And I guess the feet are spread farther apart than the limits of the base rotation?. And it looks a bit tidier and more elegant.
The motor controller cannot know how far the motors have turned the joint; even if it knows that running it for 2.3 seconds moves it by x degrees, there are too many factors that can mess up the timing. The pots will return distinct voltage values for every angle, consistently. For example, when the elbow is at some specific position, say about a third of the way through its travel, the pot will read, say, 1.6523443 volts or something like that. So if the controller is told "drive this motor forward until its pot returns 1.65 volts" it will stop at about the same angle every time.
According to the manufacturer (http://www.owirobot.com/robotic-arm-edge-1/) each 3V motor runs at 255mA at full tilt -- with no load. And there are five motors. Just being installed in the robot means there's a load, and it will go higher, all the way to the listed "stall current" of over 3 amps. The design is such that the motors cannot continuously stall in this robot, but still -- no microcontroller can deliver that directly even for a split second. You will definitely need a motor controller. I don't even think relays, transistors or MOSFETs will work because you've got to be able to reverse the polarity. By the time you've added all the circuitry to support it you've pretty much built a motor controller, so probably better to just buy one straight away.
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