Re: [oopic] H-Bridge issue...maybe.

Then I will go with the Sabertooth.

Thanks for the information.

ooPIC Tech Support wrote:
>
> The Hobby Engineering L298 board (A Solarbotics kit) is adequate,
> barely, but with little margin. The Jameco board has lots of margin,
> but it is a primitive design that will require interface circuitry. I'd
> say that unless you wanted to do your own interface to the unit that the
> Sabertooth units are WAY more sophisticated with really nice options and
> you can use oPWMS objects to drive them which leaves the PWM channels
> free to do other things.
>
> DLC
>
> Shaggy wrote:
>
>>Another fun point for them is that I noted that all of their sample code
sets
>>the value at 127. It may be that they are using the LCHB as an on/off,
>>without any ramping.
>>
>>In any event, the LCHB won't handle the power that the motor can draw, so
>>I'm in the market for a different one.
>>
>>I looked at this one:
>>
>>http://www.roboticsconnection.com/pc-77-9-10-amp-h-bridge.aspx
>>
>>but it is not just overkill, it wants a 12V power supply, which I don't
>>really want to go to if I can avoid it. The funny thing about it is that
the
>>company ships 9.6V batteries with their chassis and motors (which draw 2A
>>max), yet they don't sell an H-Bridge except ones that are more robust and
>>MUCH more robust than that.
>>
>>Saw this one, too, but I'm not sure that it is the same thing, or that it
>>will work:
>>
>>http://www.lynxmotion.com/Category.aspx?CategoryID=10
>>
>>Also this one:
>>
>>http://www.robotstore.com/store/product.asp?pid=264&catid=1565
>>
>>Then there's this kit, but it looks like it is On/Off rather than ramped.
No
>>mention of PWM controll, but I may be missing something:
>>
>>http://www.hobbyengineering.com/H1918.html
>>
>>
>>Would any of them suit?
>>
>>
>>rtstofer wrote:
>>
>>
>>>--- In oopic@yahoogroups.com, Shaggy <charrington@...> wrote:
>>>
>>>
>>>>Does the oDCMotor2 pulse work differently at 127 (full forward) than
>>>>
>>>>
>>>it does
>>>
>>>
>>>>at EVERY other value?
>>>>
>>>>
>>>Not really! At 126, the output is on all except the slightest little
>>>sliver of off time. At 127, the output is on constantly.
>>>
>>>Similarly at -127 there is the slightest sliver of off time and at
>>>-128 the output is on constantly.
>>>
>>>I do get steady ramping when using the sample program where the output
>>>varies from -128 to 0 to +127 and back again.
>>>
>>>I changed the sample code:
>>>
>>>do A = -128 to 127
>>>...
>>>do A = 127 to -128 step -1
>>>
>>>There is nothing different about 127 except that it doesn't have a
>>>pulse at all. Just a constant DC level.
>>>
>>>It's too bad RogueRobotics doesn't post their schematics. I would
>>>like to see how the thing wires up to the OOPic.
>>>
>>>Richard
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>
> --
> ------------------------------------------------------
> Dennis Clark ooPIC Tech Support
> www.oopic.com
> ------------------------------------------------------
>
>
>
> [Non-text portions of this message have been removed]
>
>
>

--
View this message in context: http://www.nabble.com/H-Bridge-issue...maybe.-tf4867316.html#a13976915
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