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How to connect BS2 to H-Bridge motor — Parallax Forums

How to connect BS2 to H-Bridge motor

azmax100azmax100 Posts: 173
edited 2006-08-26 11:24 in BASIC Stamp
Hi allyeah.gif

I have problem how to connect BS2 to H-Bridge motor.

Here I attached the schematic diagram of the H-Bridge.

Pls help.
motor1.jpg
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Comments

  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-08-25 12:30
    azmax100 -

    I'm not sure I see your problem. Here's the way I read the schematic:

    Pin 7 - V-
    Pin 6 - V+

    Pin 5 - unconnected

    Pin 4 - control lines for
    Pin 3 - motor # 1

    Pin 2 - control lines for
    Pin 1 - motor # 2

    Motor Control Pins

    0 0 = motor off
    0 1 = motor FWD
    1 0 = motor REV
    1 1 = DO NOT USE!

    What's more to say?

    Regards,

    Bruce Bates

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  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2006-08-25 15:57
    Bruce is right, but there are two potential problems I see...

    1) R29 and R32 seem to be swapped with each other as well as R31 and R35

    2) I would remove C15 and C16 and replace them with bridge rectifiers.

    For M1, connect each AC terminal "~" to the motor, then connect the "+"
    to the connector pin 6 and the "-" to the connector pin 7. Do this again
    for M2.

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.
  • azmax100azmax100 Posts: 173
    edited 2006-08-26 01:44
    Hi.

    Thanks to·Bruce & Beau· for your reply.

    Actually I'am giving wrong info. What I want to do is connecting the circuit to BOE.

    How to connect SK1 to the BOE. I want to use external power supply to the circuit. not from the BOE.

    Sorry for that.

    For the Bridge Rectifiers can u draw the schematic diagram how to replace the C15 & C16.

    I'am only beginners so i can't understand trough words.
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2006-08-26 04:34
    "I want to use external power supply to the circuit. not from the BOE"

    That's what you should do anyway. What you need to do though is connect
    the grounds together.

    Basically you would have 2 of the circuits below. And apply the truth table
    from the BOE. Select the I/O pins that you will want to use for the output.
    You will need 4 total to do this.

    INP A        INP B        MOTOR

0V              0V              OFF
5V              0V              Forward
0V              5V              Reverse
5V              5V              NOT ALLOWED



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


'INITIALIZE   Variables and Constants
INP_A1    CON   0 'IO INP_A MOTOR1  ... Range 0 to 15
INP_B1    CON   1 'IO INP_B MOTOR1  ... Range 0 to 15

INP_A2    CON   2 'IO INP_A MOTOR2  ... Range 0 to 15
INP_B2    CON   3 'IO INP_B MOTOR2  ... Range 0 to 15

IO_MASK   VAR   W0


IO_MASK = 1<<INP_A1 + 1<<INP_B1 + 1<<INP_A2 + 1<<INP_B2

LOW INP_A1                      'Preset MOTOR outputs LOW
LOW INP_B1
LOW INP_A2
LOW INP_B2
DIRS = IO_MASK

MainLoop:

          HIGH INP_A1           'MOTOR1 forward for 5 seconds
          PAUSE 5000
          LOW INP_A1            'turn MOTOR1 OFF


          HIGH INP_B1           'MOTOR1 reverse for 5 seconds
          PAUSE 5000
          LOW INP_B1            'turn MOTOR1 OFF


          HIGH INP_A2           'MOTOR2 forward for 5 seconds
          PAUSE 5000
          LOW INP_A2            'turn MOTOR2 OFF


          HIGH INP_B2           'MOTOR2 reverse for 5 seconds
          PAUSE 5000
          LOW INP_B2            'turn MOTOR2 OFF

GOTO MainLoop

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.

    Post Edited (Beau Schwabe (Parallax)) : 8/26/2006 5:45:35 AM GMT
    H-BRIDGE2.JPG
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  • azmax100azmax100 Posts: 173
    edited 2006-08-26 04:55
    Thanks Beau

    I will use the schemstic that u provide.

    One more question. Do I need the rectifier if my external source form DC?

    Regards

    Azmax100
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2006-08-26 05:35
    You should still use the rectifier. The rectifier is a fancy way of implementing back EMF diode protection.

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2006-08-26 11:24
    BTW, H-Bridges are often catagorized into two important groups --

    smoke-able and smoke-less.

    The reason Bruce Bates has DO NOT USE the 11 code is that it will damage at least the first·H-bridge.

    I am all for building a couple of individual component H-bridges to learn about it. But it is hard to beat the off-the-shelf solutons for durable control. Often the best reason for getting an H-bridge IC or a package [noparse][[/noparse]like the HB-25] is that you have that additional protecton circuitry.

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    "If you want more fiber, eat the package.· Not enough?· Eat the manual."········
    ···················· Tropical regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
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