Question on power. 9V and 5V

Hello,

I am interested in setting up some sensors to automate and monitor my irrigation system.

I am looking to utilize a moisture sensor, temperature sensor, 12V water solenoid valve, flow meter and have it run off a single uno with a non-poe ethernet sheild.

I am looking at using this passive poe injector kit just for the simplicity of running one cable for approximately 90 feet. https://www.bc-robotics.com/shop/passive-poe-injector-kit/

My question is if I supply 9V through the injector to the power jack on the arduino. Run my valve off of the VIN pin, am I still able to utilize the 5V on the UNO for the other sensors as they all require only 5V?

Thank you for your time.

Kdoubleyou: Hello,

I am interested in setting up some sensors to automate and monitor my irrigation system.

I am looking to utilize a moisture sensor, temperature sensor, 12V water solenoid valve, flow meter and have it run off a single uno with a non-poe ethernet sheild.

I am looking at using this passive poe injector kit just for the simplicity of running one cable for approximately 90 feet. https://www.bc-robotics.com/shop/passive-poe-injector-kit/

My question is if I supply 9V through the injector to the power jack on the arduino. Run my valve off of the VIN pin, am I still able to utilize the 5V on the UNO for the other sensors as they all require only 5V?

Thank you for your time.

Yes. If you hook up a 9 volt battery to the arduino, the 5V pin will still supply 5 Volts, the 3.3 Volt pin will still supply 3.3 volts, and the Vin will supply 9 volts. HOWEVER, you will need a way to safely control the 9V valve with 5V logic. To do this, I would recomend an H-Bridge, such as this one to control whether the valve is being powered by the 9V or not. Just be sure not to attach both the Vin and the 5V to the same power rail on a breadboard, or mix up any components.

Thanks Tyler, I appreciate it.

I plan to hook the valve up using the following method which should accomplish what your referring to in a different way, if I have my thoughts right.

http://www.bc-robotics.com/tutorials/controlling-a-solenoid-valve-with-arduino/

I will be running a 9V 1000mA to power the unit and yes its already on my list to ensure that I utilize separate rails for power. Last question, would I still utilize a common ground for all sensors regardless of operating voltage? Thanks

Kdoubleyou: Thanks Tyler, I appreciate it.

I plan to hook the valve up using the following method which should accomplish what your referring to in a different way, if I have my thoughts right.

http://www.bc-robotics.com/tutorials/controlling-a-solenoid-valve-with-arduino/

I will be running a 9V 1000mA to power the unit and yes its already on my list to ensure that I utilize separate rails for power. Last question, would I still utilize a common ground for all sensors regardless of operating voltage? Thanks

Yes, the circuit in the link will do the same thing. An H-bridge is essentially a bunch of transistors wired in a specific way, so for your application one transistor will work. And Yes, all the components will use a common ground. Again, just be sure to double check that you have everything wired correctly before powering it. Let me know if you have any other questions I could answer. Good Luck!

Tyler