settings. The voltage dropped steadily down to below 1V on the analog meter
at a value around 70.
However, I also went looking at the motor specs. The no load draw is 300 mA,
but the max draw at shaft lockup is 2A. I would have thought there was less
current draw at lower voltage, but I may be getting that wrong. In any
event, the 1A limit is being doubled.
rtstofer wrote:
>
> You should still check the output voltage on IOLines 17 & 18 without
> the H-Bridge. As the pulse width varies, the voltage should change.
> As I pointed out earlier, an analog meter will do the integration of
> the pulse width. A digital meter may not. If not, you need that 220
> ohm resistor in series with a 1 ufd capacitor between the pin and
> ground to form an integrator. Anything close from Radio Shack should
> work fine.
>
> One other thing: You never did say how much current your motors may
> require. Remember, the 754410 is limited to 1A per motor. That's a
> VERY SMALL motor. It is possible that the stall current (before the
> motor gets running) is so high that the driver shuts down on overcurrent.
>
> The ABSOLUTE MAXIMUM Continuous Output Current is 1.1A.
>
> So, connect your motors directly to the battery and measure the
> current. Measure as you try to stall the motor by loading it up.
>
> One amp is a VERY SMALL motor.
>
> Richard
>
>
>
>
>
--
View this message in context: http://www.nabble.com/H-Bridge-issue...maybe.-tf4867316.html#a13942338
Sent from the OOPic mailing list archive at Nabble.com.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/oopic/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/oopic/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:oopic-digest@yahoogroups.com
mailto:oopic-fullfeatured@yahoogroups.com
<*> To unsubscribe from this group, send an email to:
oopic-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
No comments:
Post a Comment