Thank you so much for helping. I think I am going use an
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I'm not sure how strong of a resistance I actually need so I was going to get a couple different resistors between 1k and 10k Ohms. I don't think I need a logic shifter although I'm not completely positive, especially if I plan to add a GSM Shield later. And then the photo transistor would detect light and if it was strong enough light it would go through the resistor. Is there anything else I am missing or might need? Also thank you for helping me with my first project.