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I have a 12v solenoid and a six volt robot (6v for servos). how do i make this work? Answered

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psymansays

8 years ago

There are tiny 12V batteries that they make for garage door openers. Using a simple NPN transistor, you can switch the 12V source from the battery to a common ground with you robot, from the robot's MCU.

I have one of those batteries, it's a Duracell, and says "MN21/23   12V" on the side. It's the same width and half the length of a AAA battery. I think they're referred to as an A23 cell.

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andy

9 years ago

Sounds cool.. I'd be tempted by a servo, but no doubt there's a good reason against using one... Will a charge pump do?

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T-Kandy

Answer 9 years ago

Yeah, a servo would make it too heavy, and i can't be bothered adding the stuff for it and it's not supposed to be a permanent attachment, it's supposed to be able to be taken off so i can use the bot as a mini sumo. Unfortunately we don't get many mini sumo competitions here in Australia. What's a charge pump? Sounds to me like a type of solenoid. No pneumatics please!

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andyT-K

Answer 9 years ago

A charge pump is a kind of circuit that (as far as I understand) uses a few transistors and capacitors to provide a different voltage to what is put in.
Here's the wiki ( Charge Pump on Wikipedia ). There is one example that comes to mind in the form of a BEAM kit from solarbotics if you click the resources tab there is a document that on page seven gives a break down on how their "voltage doubler" works (I believe this is a flavor of charge pump).

It will only work for short amounts of time (depending on the solenoid - it may have to be quite beefy in terms of big capacitors though) but if its an aesthetic thing you could set up a BEAM circuit with a voltage doubler to act as both control and driver. The document is well worth a read I think, It really is quite wonderfully informative. Hope this helps,
Drew

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pyper

9 years ago

6v will probably drive a 12v solenoid, just not terribly well.

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T-Kpyper

Answer 9 years ago

hell yeah

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orksecurity

9 years ago

Add a 12V source and a relay (or amplifier if you need analog control rather than on/off). Or replace that solenoid.

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T-Korksecurity

Answer 9 years ago

yeah i was considering a relay. im just a bit rusty with them though. do you play 40k?

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andy

9 years ago

it probably depends on what your doing with the solenoid, Is there any way you can get around using it?

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T-Kandy

Answer 9 years ago

i'm creating a clapper type gripper in the shape of a mouth for my robot. its the most simple idea.