switching polarity for a solenoid
#1
Posted 09 May 2011 - 03:01 PM
#2
Posted 09 May 2011 - 05:25 PM
Hi all,
I'm new to electronics, so this may be a silly question...
I have 4 9v solenoids that I want to drive independently of each other. To do this I need to be able to reverse the polarity to the solenoids to get them to toggle in one direction or the other (they don't return when unpowered). I asked the best way to achieve this on a different forum and someone suggested I look at an "H-Bridge". I've looked and found L293D or SN754410. Both of these sound like they can drive 2 solenoids, so I'd need 2 of them to drive 4 solenoids.
Is this the best approach, or does anyone else have any better / cheaper / easier suggestions?
Also, the Logic voltage seems to be 5v. How would I wire this up to the Netduino?
thanks
Tim
Unless I'm reading the spec sheet wrong, it can handle 2 to 5.5v on the logic side, which means the Netduino can safely drive the SN754410 with out the need for additional components.
I found this DC motor control with an H-Bridge tutorial you might be interested in. They use an Arduino, but you can do it with the Netduino just fine.
-dan
#3
Posted 10 May 2011 - 07:44 AM
Unless I'm reading the spec sheet wrong, it can handle 2 to 5.5v on the logic side, which means the Netduino can safely drive the SN754410 with out the need for additional components.
Hi Dan,
thanks for the link.
The reason I was asking about driving 5v from netduino was because on the hardware details page:
http://www.netduino....duino/specs.htm
it says this:
digital i/o are 3.3 V--but 5 V tolerant
to me that says the digital outputs will push out 3.3v but the inputs can take up to 5v. Am I wrong? Do I need to do anything to get the outputs to push out 5v?
thanks
Tim
#4
Posted 10 May 2011 - 11:32 AM
#5
Posted 10 May 2011 - 11:45 AM
Tim, why do you need pushing the N's outputs to +5V?
I agree with Dan: the specs say it is Netduino compatible.
Cheers
Hi Mario,
like I say, I'm a newbie, so I'm probably missing something. I was just worried that the Netduino wouldn't have enough voltage to drive the logic side of the H-Bridge. You guys seem to think there won't be a problem, so I've placed an order and will give it a go.
thanks to both of you for your advice
Tim
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