Member Since: January 31, 2012

Country: United States

  • What a great idea!

  • Am I looking at a different datasheet from everybody else? I’ve seen this 80kohm load value thrown around in a few comments, and that seems to be the reason I was getting screwy readings (I was using a 10k trim pot as a voltage divider), but I cannot for the life of me find anything in the datasheet that says so. Some of the comments are older, is there an older version of the datasheet and the newer ones don’t mention this? Or am I blind?

  • Agreed, I need more Pete.

  • Can these be removed from the encoder once attached? I’ve pulled hard enough that I am concerned that I might damage the encoder, but the knob is stuck pretty good.

  • And since the ampere is a rate of current flow (coulombs per second), 14914’s analogy is perfectly valid. 500mA per hour would mean that the electron flow is accelerating by 500mA every hour. Leave it plugged in for a day, and you’ll be pulling 12 amps out of that poor USB socket! That’s obviously silly, and what the description should say is that it charges at a rate of 500mA.

  • I’m moving a project over to this driver from one where all control was through 4 PWM pins (2 per motor). To drive CW, for example, you would hold A high and pulse B low, and to drive CCW, you would hold B high and pulse A low. This board is set up instead to take 2 slow inputs and 1 PWM input per motor, with the slow inputs setting the direction of rotation (in the exact same manner as my existing project, one side high and the other side low = drive) and the PWM input setting the speed. My question is, will the “slow” directional inputs tolerate being switched at PWM speeds? Can I just tie the PWM inputs high permanently and use PWM on the directional inputs instead?

    *edit: Upon closer inspection, my other board uses this exact same chip, and that is in fact what they did. So yes, that will apparently work. I’ll update if I smoke it. ;)

  • Just out of curiosity, what servo was this claw designed to fit? Because it sure isn’t your medium servo (at least I hope for the designer’s sake it’s not). To get it mounted at all, the screws have to be totally cock-eyed, and even then the servo is crammed over so tight it gets bogged down and continually clicks and buzzes when it should simply be holding position silently.

    The shape of the opening, rectangular at one end and round at the other, matches the general shape of many servos I have lying around, but it’s too small for any of them to actually fit through to where the mounting tabs could sit flush. I realize this is more of a toy than a piece of precision equipment, but it goes together so badly that it leaves a pretty bad impression of the whole thing.

  • That, and Duck Tape (and its imitators) are actually really lousy for duct work, so it’s a misnomer anyway.


No public wish lists :(