Troubles with H-bridge
Hello Stampers.
I know, my problem isn't really stamp related but because I use a stamp in
the project, and because there are very smart guys here....;-))
I use a stamp to control a self designed H-Bridge and it won't work, the
hole story is to long for this forum so I putted everything on
http://users.pandora.be/jff/tankmotorsturing/tankmotorsturing.html
Maybe somebody knows the cause of my problem?
Greetz from Belgium
Michel De Meester
Met vriendelijke groetjes,
> ************************************************
> Michel De Meester
> Biotechnisch Onderhoud
> Universitair Ziekenhuis Antwerpen
> Wilrijkstraat 10
> 2650 Edegem - B
> tel: ++32 (0)3 821 36 47
> e-mail: michel.de.meester@u...
>
> *************************************************
>
>
I know, my problem isn't really stamp related but because I use a stamp in
the project, and because there are very smart guys here....;-))
I use a stamp to control a self designed H-Bridge and it won't work, the
hole story is to long for this forum so I putted everything on
http://users.pandora.be/jff/tankmotorsturing/tankmotorsturing.html
Maybe somebody knows the cause of my problem?
Greetz from Belgium
Michel De Meester
Met vriendelijke groetjes,
> ************************************************
> Michel De Meester
> Biotechnisch Onderhoud
> Universitair Ziekenhuis Antwerpen
> Wilrijkstraat 10
> 2650 Edegem - B
> tel: ++32 (0)3 821 36 47
> e-mail: michel.de.meester@u...
>
> *************************************************
>
>
Comments
voltage? Skip
Original Message
From: De Meester, Michel [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=hZ7v2ATQsJo3dlyuFOLocrWVER8CbP_1Q_HMxjcME4o1b-OVLB21NL7H2r9NER_3jJ-OYtbNADJPB_qOYVQLxDSRFpWaO5Q4Dg]Michel.De.Meester@u...[/url
Sent: Friday, April 12, 2002 10:21 AM
To: 'basicstamps@yahoogroups.com'
Subject: [noparse][[/noparse]basicstamps] Troubles with H-bridge
Importance: High
Sensitivity: Private
Hello Stampers.
I know, my problem isn't really stamp related but because I use a stamp in
the project, and because there are very smart guys here....;-))
I use a stamp to control a self designed H-Bridge and it won't work, the
hole story is to long for this forum so I putted everything on
http://users.pandora.be/jff/tankmototuring/tankmotorsturing.html
Maybe somebody knows the cause of my problem?
Greetz from Belgium
Michel De Meester
Met vriendelijke groetjes,
> ************************************************
> Michel De Meester
> Biotechnisch Onderhoud
> Universitair Ziekenhuis Antwerpen
> Wilrijkstraat 10
> 2650 Edegem - B
> tel: ++32 (0)3 821 36 47
> e-mail: michel.de.meester@u...
>
> *************************************************
>
>
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>Hello Stampers.
>
>I use a stamp to control a self designed H-Bridge and it won't work, the
>hole story is to long for this forum so I putted everything on
>
>http://users.pandora.be/jff/tankmotorsturing/tankmotorsturing.html
You need a proper FET driver circuit for the high side FETs. The Stamp
puts out 5V. A standard N-channel mosfet requires a gate voltage at least
10V higher than the source - 12V is better. You want the FET to fully
turned on - that means the source voltage will be the same as the drain
voltage which is 12V. The gate needs to be at least 10V higher than that: 22V.
A simple but effective H-bridge driver circuit can be found at Bob Blick's
site: <www.bobblick.com> . Give it a try.
dwayne
Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
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>Hello Stampers.
>
>
>I know, my problem isn't really stamp related but because I use a stamp in
>the project, and because there are very smart guys here....;-))
>
>I use a stamp to control a self designed H-Bridge and it won't work, the
>hole story is to long for this forum so I putted everything on
>
>http://users.pandora.be/jff/tankmotorsturing/tankmotorsturing.html
>
>Maybe somebody knows the cause of my problem?
>
>
>Greetz from Belgium
>
>Michel De Meester
The Stamp isn't capable of driving the FETs hard enough. You need a
driving source capable of 10 - 15 volts - note that 15 volts is the data
sheet maximum. It also looks like you're using the same drive current from
the Stamp pins to light the LEDs. Remove the LEDs and see if that helps,
but I still think you'll need a higher voltage driver than the 5 volts the
Stamp provides.
Jim H