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olivthill

Member Since: July 16, 2013

Country: France

  • An Arduino or the Red card clone by Sparkfun, or a Pololu controler, can be used for your purpose. I have worked with continuous rotation servos myself. It was for a project of a CNC stand. Unfortunately, I did not find any servo having a 1 degree acuracy, even digital ones which are more expensive and precise than analog ones. Instead, I plan to replace them with stepper motors. It is said they have that kind of accuracy, and I see that everybody uses them for CNC machines.

    Edit : if you use servos with feedback, then they must be the servos that are not the standard ones for hobbyists (5 or 6 volts, weight 10 to 50 grams, and are linked with 3 leads only), but the ones working with 7.4 V or 11V or more and 5 leads.

  • Could you explain in a just one or two sentences what is the goal of the FTDI module? On the picture, I see that on one side, it is linked to the Raspberry via the wedge. But, on the other side, I don’t see where the lead goes to. I guess it could be connected to an Arduino, which could blink leds and run motors. Am I correct? In that case, why don’t you connect the Arduino directly to a USB port of the Raspberry? Sorry for that question, but I am a beginner, and this is a … starter kit.

  • I am asking myself the same questions. It would be great if somebody could answer them.

    Now, I am using a Pololu Mini Maestro. But I would consider using that Sparkfun breakout board instead if I’d know how to connect an external source of power that might deliver from 0 to 5 amps to a bunch of hungry servos, without burning the TLC5940.

  • On most servos, the pwm signal is not on the middle pin. It is the VC which is on the middle pin. Fortunately, the design of the breakout board is correct regarding this issue.

  • All that most maddens and torments; all that stirs up the lees of things; all truth with malice in it; all that cracks the sinews and cakes the brain; all the subtle demonisms of life and thought; all evil, to crazy Ahab, were visibly personified, and made electronically assailable in Hobby Geek.

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