Arduino Power Supply

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Arduino Power Supply

Postby Retro » Sun Oct 28, 2018 1:09 pm

Hi All,

Totally just starting in electronics. Would like to ask for some advice regarding supplying power to add-ons in circuitry.

Items:
Arduino Uno
4 Channel Relay
Moisture Sensor
12v Solenoid Valve

I would like to ask if all these can actually be powered through the Arduino alone?

Here is what I have gathered:
The moisture sensor is 5v which I can use the 5V pin on the Arduino Board.
The relay is also 5v, can they share the 5v pin on the Arduino if i extend the connection to a breadboard?
By plugging a barrel 12v connector to the Arduino and using connecting the Solenoid Valve to the Vin of the Arduino, it should work right?

Thanks in advance for the attention. Appreciate if you can point out any mistakes.
Retro
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Re: Arduino Power Supply

Postby ZaM » Mon Oct 29, 2018 11:02 am

That should be work, but if you already add Breadboard to your circuit, why not you add 2 more component like LM7805 and 2 capacitor for power up relay and moisture sensor?
ZaM
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Re: Arduino Power Supply

Postby Retro » Mon Oct 29, 2018 2:32 pm

ZaM WROTE:That should be work, but if you already add Breadboard to your circuit, why not you add 2 more component like LM7805 and 2 capacitor for power up relay and moisture sensor?


Hi ZaM,

Thank you for your reply.

Initially I was thinking of power isolation between the Uno, Relay, and 12V valve. Instead of everything drawing power through the arduino, from reviews I read online, it appeared to me that drawing high voltage through the arduino is bad and probably will fry the arduino.

So if power isolation is put in place, I would have 3 power supplies to the setup:
1x 5V PS to Arduino USB + 1x Moisture Sensor on 5V pin
1x 5V PS to Relay
1x 12V PS to Solenoid Valve

Additionally I don't have LM7805 Regulator on hand :|
Retro
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