I bought the AL5D arm kit a year ago and I am trying to use it for a competition again this year. The problem is the elbow motor, HS-755HB, is not working properly. I use the sample code which worked fine before, but now the elbow motor just goes up and down continuously after the code is uploaded.
I feel like it is not a code problem because I also tried some of my own code and the elbow motor was doing the same thing.
I plugged it in to the right spot on the board but it is the only motor that is not working.
Is this a problem within the motor?
If so, is there any way to fix it or will I have to buy a new one?
Check that the wiring is correct - yellow goes to yellow, black to black. Check the servo on its own as well using the free SSC-32 Servo Sequencer: robotshop.com/en/ssc-32-serv … ility.html
Have you figured it out yet? I’m having the same problem. I used the kit for Science Olympiad last year. The elbow has the same problem. We have tried other hs-755hb motors and other types too. We don’t think that the motor is the problem. It could potentially be the botboarduino. We use a mimicry control system.
What have you tried? Any progress???
I’m working on it right now. It is seeming to just be the 755 now. Are there any servomotors that would work as a replacement that you know of? I believe if we find a servo with equivalent torque and close size it could fit in the bracket and work.
The HS-755HB motor will “spaz out” moving up and down as soon as power to the servos is switched on.
I have changed the equivalent potentiometer, wires, and the pin in which the motor is connected.
Sometimes when the HS-755HB is connected directly to the BotBoarduino it responds to the controlling movement smoothly.
But when wires are connected between it it “spazes out”.
Other times it will spaz out even when connected directly.
I have four HS-755-HB motors, one of which I only just got a few weeks ago. I have tested three of them and they have the same problem. But when I connect an 805 or 322 is doesn’t do the same thing when connected directly. But they will also spaz out when more wires are connected.
All the grounds for the potentiometers are combined to one, I’m not sure if that could change it?
Also, I have two al5d kits. One does not have this problem at all. Right now the only difference is the type of jumper wire is different so last night I ordered 6 lynxmotion servo extender cables to see if that changes it. I also ordered a new BotBoarduino to see if that would change anything, and I also ordered an HS-755MG motor to see if that works (as it is the same size and torque).
Also, all wires have been correctly attached.
It seems to be a signal issue, not a short (I’ve shorted one before and this is different).
I know that is a lot of information. But I feel like I’ve tried everything possible. The only thing I can think of is a hardware issue, hopefully the wires because that is the easiest fix.
Is there something that you can think of that I could be missing?
I really don’t know enough about wire specifics to diagnose it, I’m just changing things in the hope that it fixes it. I also don’t know much about servos besides how to hook them up, not to use too much voltage, the degree of rotation, and minimal knowledge of the torque.
Now both elbow servos are having the “spazzing” problem.
All four of my HS-755HB motors are doing this. I plugged in a Hs-322hd motor at the end point of the wires and it did not malfunction. I am going to buy the motor that you said could replace the 755 and place it in the brackets.
On the hitec website, 7th item down, I interpret “, when using the 7940/45/50’s in applications that require a very long extension, they may randomly jump (glitch)” as referring to potentially the 755, as it is in the 7 “50’s”
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