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Question on controlling HB-25 using Propeller — Parallax Forums

Question on controlling HB-25 using Propeller

poli275poli275 Posts: 6
edited 2012-03-15 20:56 in Propeller 1
Hi everyone, I'm facing a problem with having the HB-25 to run using Propeller. before posting this, I had read this post:

http://forums.parallax.com/showthread.php?91535-what-up-hb-25&p=628399#post628399

I tried the code, it din't work. I did my own code which I will attach here as well. Apparently, the propeller can perform Pulsout to the HB-25, but it did not respond to it. I tried to plug in a standard servo to another set of pin and the servo did run. Any idea on what will be the possible cause of this?

More information if you need: I'm using a propeller USB Protoboard, powered with a 9v battery. The same goes to HB-25. The HB-25 is connected to the propeller on pin 7, correct connection/polarity.

Appreciate any help provided :D
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Comments

  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2012-03-15 10:24
    What kind of 9V battery are you using and what kind of motor is connected? If you are just using a small 9V transistor battery then it may not be able to supply enough power. Once of the first things I would do is try a separate battery for the HB-25's.

    The HB-25's should respond just like a standard servo.

    Robert
  • TubularTubular Posts: 4,706
    edited 2012-03-15 12:44
    I agree the problem will be the 9v battery. Motors can take a lot of current to begin moving.

    The HB25s can handle something crazy like 20 Amps. I regularly use mine with a 12v sealed lead acid battery,controlling them is as RobotWorkshop says, just like a normal servo.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-03-15 13:21
    If you're using a different power source for your Propeller, you'll want to make sure the two power sources share a common ground.
  • poli275poli275 Posts: 6
    edited 2012-03-15 18:41
    Yea those 9v transistor battery plus a tamiya motor. I will try with other type of batteries in lab tomorrow and report the result here. Thanks for your help guys :)
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2012-03-15 20:56
    As a wise man once said to me when I got my first HB-25 and was having similar problems running it off of a 9V battery.... "Dude, your trying to start a car with a watch battery" ... well he didn't say it exactly like that but it was the same point he was trying to make. <- Thanks Chris Savage :-)

    A 9V battery definitely does not supply enough current for the HB-25 ... You need something with a few Amps behind the wheel for the HB-25 to operate correctly.
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