Shop OBEX P1 Docs P2 Docs Learn Events
Victor 883 Speed Control — Parallax Forums

Victor 883 Speed Control

Scott PortocarreroScott Portocarrero Posts: 72
edited 2009-07-26 01:14 in BASIC Stamp
After I master the BOEBot I am going to build a bigger version (a much bigger version) I have two Victor 883's controlling two 24 volt wheel chair motors. Can I connect the 883s to the BOE as if they were servos or do I need a PWMPAL. I'm not real clear on the BS2 & PWM.

Comments

  • $WMc%$WMc% Posts: 1,884
    edited 2009-07-08 05:18
    Scott Portocarrero

    Can You post the specs for the Victor 883?


    _________$WMc%___________

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    The Truth is out there············································ BoogerWoods, FL. USA
  • Scott PortocarreroScott Portocarrero Posts: 72
    edited 2009-07-09 02:32
    Here is a link:

    http://www.robotmarketplace.com/products/IFI-V883.html
  • $WMc%$WMc% Posts: 1,884
    edited 2009-07-09 03:12
    Scott Portocarrero

    The link you provided was not very informative.

    To be safe I would use a driver, something like the IRL510 MOSFET to power the inputs of the V883. I would place a current meter in series with the V883 input to measure the current needed to drive the V883. I would also add in a resister, increasing the value to find the minimum current needed to drive the input of the V883. You may find that the current is in the range of the $STAMPs out put. less then 15mA.

    PWM is pretty easy thanks to the folks @ Parallax. Take a look at controlling a servo in the StampWorks Manual.


    ________________$WMc%_______

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    The Truth is out there············································ BoogerWoods, FL. USA
  • Scott PortocarreroScott Portocarrero Posts: 72
    edited 2009-07-09 03:19
    So what is the difference between PULSOUT and using the PWMPAL?
  • Scott PortocarreroScott Portocarrero Posts: 72
    edited 2009-07-09 03:45
    So the Stamp can ouputsed PWM? Is the PULSOUT command actually using PWM? I am confused confused.gif
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2009-07-09 04:07
    You ought to get an HB-25 for this.
  • Scott PortocarreroScott Portocarrero Posts: 72
    edited 2009-07-09 04:33
    I have a 200 amp stall current per motor with 60amp continuous @ 24 volts can't used HB-25. I already have the IFI Victor 883 I just want to know if I can drive it with the BS2 using PULSOUT or will I have to use PWM ? confused.gif
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2009-07-09 12:43
    You can use "PWM", but there's a limit to that.· You could use PULSOUT, but you'll have to repeatedly refresh/update that.· Read up on those in PBASIC_Help.· Read up on the PWMPAL, I think that once it gets set to a given duty cycle then it'll stay there till it's updated further.
  • Mike HendricksMike Hendricks Posts: 2
    edited 2009-07-13 01:01
    This is also something that I've been tinkering around with for awhile. I've had a little bit of success using the pulsout command, but as it was mentioned earlier, it has to be constantly refreshed.

    I'm not sure if the PWMPAL is necessary to do this, especially since BS2's were used in the early FRC controllers that were made by IFIRobotics (who makes the Victor speed controllers).

    Sadly, the code examples from IFI are slightly useless, since the actual PWM output was generated off a different microcontroller, not the BS2 itself. I have a PWMPAL lying around here somewhere that I might try just for kicks to see if I can get the Victor to be driven correctly. If I make any break throughs (doubt it eyes.gif ) .. I'll post them here.
  • Scott PortocarreroScott Portocarrero Posts: 72
    edited 2009-07-13 04:25
    good to know, thank you, and keep in touch
  • kennetkennet Posts: 33
    edited 2009-07-19 04:51
    tongue.gif·I use both the HB-25 and the Victor 883 in my projects. Here is a program you can use as a guide.

    ' {$STAMP BS2}
    ' {$PBASIC 2.5}

    counter········ VAR·· Word
    pulseCount····· VAR·· Word
    address········ VAR·· Byte
    instruction···· VAR·· Byte
    INPUT 0:INPUT 1: INPUT 3
    DATA· "Q"
    FREQOUT 15, 1000, 4500
    HIGH 14···························· 'Program Indicator LED on
    HIGH 13···························· 'Victor 883 Power Up
    HIGH 3····························· 'HB25 Power Up
    DO UNTIL (instruction = "Q")
    ·READ address, instruction
    ·address = address + 1
    ·SELECT instruction
    ··· CASE "F":GOSUB Forward
    ··· CASE "D":GOSUB Veer_Left
    ··· CASE "L":GOSUB Left
    ··· CASE "C":GOSUB Veer_Right
    ··· CASE "R":GOSUB Right
    ··· CASE "J":GOSUB Turn_Around_Right
    ··· CASE "V":GOSUB Turn_Around_Left
    ··· CASE "B":GOSUB Backward
    ··· CASE "Y":GOSUB Waist_Left_One_Degree
    ··· CASE "X":GOSUB Waist_Right_One_Degree
    ··· CASE "P":GOSUB Delay
    ·ENDSELECT
    LOOP
    ·LOW 14···························· 'Program Indicator LED off··························· '
    ·LOW 13···························· 'Victor 883 Power Down
    ·LOW 3····························· 'HB25 Power Down
    ·INPUT 0:INPUT 1: INPUT 2
    END
    Forward:
    FOR pulseCount = 1 TO 60
    PULSOUT 0, 750 + pulseCount
    PULSOUT 1, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 65
    PULSOUT 0, 810
    PULSOUT 1, 810
    PAUSE 17
    NEXT
    RETURN
    Veer_Left:
    FOR pulseCount = 1 TO 75
    PULSOUT 0, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 100
    PULSOUT 0, 825
    PAUSE 17
    NEXT
    RETURN
    Veer_Right:
    FOR pulseCount = 1 TO 75
    PULSOUT 1, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 100
    PULSOUT 1, 825
    PAUSE 17
    NEXT
    RETURN
    Left:
    FOR pulseCount = 1 TO 75
    PULSOUT 0, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 50
    PULSOUT 0, 825
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 60
    PULSOUT 0, 750 + pulseCount
    PULSOUT 1, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 10
    PULSOUT 0, 810
    PULSOUT 1, 810
    PAUSE 17
    NEXT
    RETURN
    Right:
    FOR pulseCount = 1 TO 75
    PULSOUT 1, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 50
    PULSOUT 1, 825
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 60
    PULSOUT 0, 750 + pulseCount
    PULSOUT 1, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 10
    PULSOUT 0, 810
    PULSOUT 1, 810
    PAUSE 17
    NEXT
    RETURN
    Backward:
    FOR pulseCount = 20 TO 1
    PULSOUT 0, 750 - pulseCount
    PULSOUT 1, 750 - pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 100 TO 1
    PULSOUT 0, 730
    PULSOUT 1, 730
    PAUSE 17
    NEXT
    RETURN
    Turn_Around_Right:
    FOR pulseCount = 1 TO 90
    PULSOUT 0, 750 + pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 90 TO 1
    PULSOUT 1, 750 - pulseCount
    PAUSE 17
    NEXT
    PAUSE 500
    RETURN
    Turn_Around_Left:
    FOR pulseCount = 80 TO 1
    PULSOUT 0, 750 - pulseCount
    PAUSE 17
    NEXT
    FOR pulseCount = 1 TO 80
    PULSOUT 1, 750 + pulseCount
    PAUSE 17
    NEXT
    RETURN

    Waist_Left_One_Degree:
    FOR pulseCount = 149 TO 1
    PULSOUT 2,750 - pulseCount
    PAUSE 20
    NEXT
    RETURN

    Waist_Right_One_Degree:
    FOR pulseCount = 1 TO 150
    PULSOUT 2,750 + pulseCount
    PAUSE 20
    NEXT
    RETURN

    Delay:
    FOR counter = 1 TO 80
    PULSOUT 2,750
    PAUSE 20
    NEXT
    RETURN
  • Scott PortocarreroScott Portocarrero Posts: 72
    edited 2009-07-19 07:00
    I like it! Do you have any picts of the bot that thos program was used in?
  • kennetkennet Posts: 33
    edited 2009-07-19 20:46
    Scott, This program was written several years ago and the robot it was designed for has·undergone significant changes. I will post photos in about a week.

    I can tell you that it represents an evolutionary advancement in humannoid android technology. No, it is not a Bi-ped. It does have an articulated spine, is Adult- sized, and can·bend completely over a hospital bed or dinner table!

    ·The Victors have slight variations in their parameters.·Make sure to test each individualy. The HB-25's· are fine for now (I still use them for now),but not for robot joints. If you want greater precision and strength ,you may want to look into hacking your old servos and using them in conjunction with automotive winsheild wiper motors.Then·use the PSC.·There are also powerful servos you can buy from Vantec, but they can be quite expensive, $500 or more.



    Ken
  • Scott PortocarreroScott Portocarrero Posts: 72
    edited 2009-07-25 21:38
    I have a PWMPAL lying around here somewhere that I might try just for kicks to see if I can get the Victor to be driven correctly. If I make any break throughs (doubt it eyes ) .. I'll post them here. said...


    I tried controlling the SuperBOE))) via Pulsout straight to the Victor 883 and it works great!!! Weird, because when I try to control the 883s with a regular remote JR 9303, I can't get the motors to turn!!! I think I need I need the little PWM driver made by IFI
  • Mike HendricksMike Hendricks Posts: 2
    edited 2009-07-26 01:14
    Scott Portocarrero said...
    I tried controlling the SuperBOE))) via Pulsout straight to the Victor 883 and it works great!!! Weird, because when I try to control the 883s with a regular remote JR 9303, I can't get the motors to turn!!! I think I need I need the little PWM driver made by IFI

    I have also had some recent success using pulsout to drive the 883 from a BS2 (although I haven't got it down perfect yet).

    As far as the JR 9303 is concerned, I wouldn't be surprised if you needed the driver from IFI. If you had the hardware and time, I suppose you could compare the PWM output from the SuperBOE against the JR 9303 on a scope. Until recently, my experience on driving Victors has only been with IFI Competition Controllers.
Sign In or Register to comment.