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

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
>
>
>
>

--
View this message in context: http://www.nabble.com/H-Bridge-issue...maybe.-tf4867316.html#a13963419
Sent from the OOPic mailing list archive at Nabble.com.

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