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  • Repurposed Battery-Powered Laptop Monitor

    "On an interesting note, I also measured the voltage across the batteries as they were discharging. I noticed that when the screen's back-light was turned on, the voltage reading went down to about 0.7 V below the reading when the back light is off."As per Ohms Law you should expect to see a voltage drop on the batteries as the current increases in the circuit. I wouldn't be surprised to see the screen turn off with low voltage either since it's unlikely your batteries can supply the current necessary and still maintain a voltage high enough to satisfy the regulator. In other words you have enough battery voltage just not enough current capability. A larger battery (something like an 8Ah 12V) on the other hand could do the trick. These are often found in emergancy lights and a...

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    "On an interesting note, I also measured the voltage across the batteries as they were discharging. I noticed that when the screen's back-light was turned on, the voltage reading went down to about 0.7 V below the reading when the back light is off."As per Ohms Law you should expect to see a voltage drop on the batteries as the current increases in the circuit. I wouldn't be surprised to see the screen turn off with low voltage either since it's unlikely your batteries can supply the current necessary and still maintain a voltage high enough to satisfy the regulator. In other words you have enough battery voltage just not enough current capability. A larger battery (something like an 8Ah 12V) on the other hand could do the trick. These are often found in emergancy lights and are easy to source.

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    • Mega328 with LCD, Keypad and FTDI in-circuit programming
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  • Mega328 with LCD, Keypad and FTDI in-circuit programming

    Thanks. I've tried to make it as clear as possible. Hopefully some will find it useful.

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