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Topic: Arduino + solenoid powered by on source (Read 564 times) previous topic - next topic

jirik23

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

LarryD

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?
The way you have it in your schematic isn't the same as how you have it wired up!


LarryD

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.
The way you have it in your schematic isn't the same as how you have it wired up!

jirik23

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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