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Author Topic: Arduino + solenoid powered by on source  (Read 400 times)
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jirik23
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« on: January 22, 2013, 04:16:21 pm »
 Bigger Bigger Smaller Smaller Reset Reset
Hello. I would like to power solenoid and arduino with one power source. Is it safe to connect it like it is on the picture? Thanks.
http://resize.like.cz/images/89_24_18_96_22-01-13-11-53-06_1358851986nyx_2.png
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LarryD
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« Reply #1 on: January 22, 2013, 06:03:27 pm »
 Bigger Bigger Smaller Smaller Reset Reset
What is the resistance of the solenoid?
Its best to label the GND as 0 volts rather than -10V.
What is the current rating of the 10 volt power supply?
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jirik23
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« Reply #2 on: January 23, 2013, 11:34:21 am »
 Bigger Bigger Smaller Smaller Reset Reset
Solenoid: http://www.ebay.com/itm/330850756486?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
12V 1A

As a power source i need to use 9V battery
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LarryD
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« Reply #3 on: January 23, 2013, 04:55:25 pm »
 Bigger Bigger Smaller Smaller Reset Reset
I see your solenoid is 12 volts, 1A.
It may not work at 10 or 9 volts.  If it does, your power supply should be rated at at least 1.5 amps
as your controller needs power.
I think I would add a diode & large capacitor across the power supply o/p (may be 470uF) to supply the initial solenoid surge current.

* solonoid.jpg (46 KB, 560x468 - viewed 12 times.)
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jirik23
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« Reply #4 on: January 23, 2013, 05:16:38 pm »
 Bigger Bigger Smaller Smaller Reset Reset
OK. Thanks a lot. I will try it. I have to buy these components. What about to add 100k pulldown resistor between transistor gate and GND to avoid problems when reseting arduino?
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