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1  Using Arduino / Project Guidance / Re: Too much amperage for Arduino power supply? on: April 11, 2012, 01:21:49 pm
Thank you all for your responses!
2  Using Arduino / Project Guidance / Re: Too much amperage for Arduino power supply? on: April 11, 2012, 11:58:20 am
Getting over my head here, but the diagrams above are to ensure a consistent flow of power to the Arduino while the pump runs?

Do you feel this type of setup is necessary to protect the Arduino from harm?
3  Using Arduino / Project Guidance / Re: Too much amperage for Arduino power supply? on: April 10, 2012, 06:56:31 pm
Thank you.

Do you think that the Arduino could be damaged when the pump runs since they share a battery? Could there be some type of power spike?


I attached a rough drawing of the project.
4  Using Arduino / Project Guidance / Too much amperage for Arduino power supply? on: April 10, 2012, 05:35:01 pm
Hello,

I have a project that will require a large 12-volt battery to run a pump. Can I power the Arduino itself from this battery as well?

I'm thinking that although the battery can supply more Amps than the Arduino needs, it will only provide what the Arduino draws. In this case, it looks like I could power the Arduino from the large battery.

Or... the large battery could fry the Arduino.

Is there such a thing as too much available Amperage?

Thank You
5  Using Arduino / General Electronics / Re: Arduino DC adapter- can I switch center pin - to center pin + ? on: November 14, 2011, 01:11:12 pm
Thank you
6  Using Arduino / General Electronics / Arduino DC adapter- can I switch center pin - to center pin + ? on: November 14, 2011, 11:57:41 am
Hello,

I have an old DC adapter that is 9v, 500mA but has a negative middle pin.

Could I just cut the wires and reverse them? Would that create a 9v 500mA middle pin positive? Or... am I missing something?

Thank you

- Noob
7  Using Arduino / Project Guidance / Re: Running 12-volt pump from Arduino on: September 14, 2011, 06:20:46 pm
Thanks for the advice everyone
8  Using Arduino / Project Guidance / Re: Running 12-volt pump from Arduino on: September 11, 2011, 07:36:11 pm
I have a power supply for the pump- what I'm not sure about is can I switch the relay directly from an Arduino pin?

Am I missing a step between the Arduino pin and the relay? If it's a transistor, what kind?


Or is Arduino able to work the relay without any other device?

(I made a crude diagram and attached it.)
9  Using Arduino / Project Guidance / Running 12-volt pump from Arduino on: September 11, 2011, 03:01:06 pm
Hello

I'm trying to create a garden watering system controlled by Arduino. I have an Uno and a 12-volt pump.

Can I run the pump from my Arduino board with the relay below from the SparkFun inventor's kit? Do I need something else? Thank you



Relay SPDT Sealed
Single Pole - Double Throw (SPDT) sealed
This relay's coil is rated up to 12V, with a minimum switching voltage of 5V. The contacts are rated up to 5A (@250VAC, 30VDC).
    5V DC SPDT Relay
    Rated up to 5A
    Fully Sealed
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