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Topic: Wire in external power and still control power? (Read 371 times) previous topic - next topic

I don't know if this is feasible, but I have a very small 40mm fan which is rated at 12 V/0.07 A, and the Arduino really can't run it with 5 volts. I plugged it into a 9 volt battery and the power worked great.

How would I go about adding around 9 volts for the fan while still letting the board control the power (this is a temperature control system for my BBQ smoker with thermistors. )


Thanks

James C4S


I don't know if this is feasible, but I have a very small 40mm fan which is rated at 12 V/0.07 A, and the Arduino really can't run it with 5 volts.

You need to look at voltage and current.  The fan needs 70mA at 12V. 

You'll need to use a transistor to connect it to an Arduino.  Some how I suspect others have done this.  (https://www.google.com/search?q=control+12v+fan+with+arduino)


I plugged it into a 9 volt battery and the power worked great.

FYI.  Those small 9V batteries are lousy at running motors (like fans).  It'll only last 4 or 5 hours if the fan draws 50mA (de-rating since you aren't running at 12V).  You'll want to use a AC to DC 9V supply.
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JimboZA


You'll want to use a AC to DC 9V supply.


My late father-in-law often mentioned a steam driven bbq spit design that he saw decades ago in a magazine (PM or similar I suppose). Alas he could never produce the design but was adamant that he had seen it, probably back in the 50s or so.

Since this is for a bbq, you could rig some kind of steam powered generator with the boiler tubes in the coals.....
My hovercraft is full of eels.

No PMs for help please.
DO NOT power servos from Arduino 5V: give them their own power and connect the grounds.

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