I have plans to make this setup independent of a power supply,
However, when I do so my LCD screen goes white and the circuit does not behave (or work for that matter) as before.
I have plans to make this setup independent of a power supply,Is the tank lighting and pump also independent of a power supply?
However, when I do so my LCD screen goes white and the circuit does not behave (or work for that matter) as before.Which LCD screen? There appear to be 2 LCD screens. The Arduino is capable of powering the LCD from it's regulated 5V supply. Directly powering the LCD with 9 volts doesn't seem like a good idea to me, unless the idea is to make the LCD suffer the same fate as the LEDs.
There is only one LCD screen. You should be able to see more clearly in the photo attached.
Also, since when I read the outpout of the battery source it varies from 3v to 9.6 v, so would that mean I need a capacitor to use a battery?
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