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1  Using Arduino / General Electronics / Re: Probe and LCD both need 5V, How do I accommodate this? (First Project) on: January 28, 2013, 09:53:25 pm
I'm pretty sure I could use the same pin for both, there isn't much draw from a probe but how would I go about wiring something like that?

Do I just form a parallel circuit between the 5v and ground on a breadboard?

edit: Tried shortening the wires. Still the same fluctuation on 3.3V. Is there a way to test if the 3.3V pin is faulty?
2  Using Arduino / General Electronics / Re: Probe and LCD both need 5V, How do I accommodate this? (First Project) on: January 28, 2013, 06:06:33 pm
I was initially running it through my USB. I've had some power supply issues with my USB before so I tried it with a 9V adapter as well. Both had the same problem.

Just to clarify, the probe runs fine on 5V but fluctuates on 3.3V even though the stamp is rated for anywhere between 3.3-5.5V.

Thanks for the help.
3  Using Arduino / General Electronics / Probe and LCD both need 5V, How do I accommodate this? (First Project) on: January 28, 2013, 05:52:00 pm
Hi, this is my first Arduino project and I'm building a temperature correcting pH probe with LCD/keypad. Although I've had some programming experience with C++ and Java I have no knowledge about circuits.

My issue is that when I run my probe with Atlas Scientific pH stamp and AT Mega2560, I get a fluctuating pH +/- .2 on 3.3V VCC. When I stick it into the 5V it runs fine. Is there something wrong? If I can't fix it how can I run both this probe and my LCD simultaneously if they both use the 5V pin.

Sorry if I jumbled up vocabulary or anything...hopefully I can get this wiring out of the way soon so I can start writing ha.
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