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Thanks for that, I have read alot on the forums but find some of the terminology to be overwhelming.
I have another question (this is gunna sound REAL noob) but is a "basic" voltage regulator just a fancy resistor?
anything wrong with scrapping all the battery packs etc, and just using a 9V battery to power the lot?
[...] is a "basic" voltage regulator just a fancy resistor?
also what lead me to the above question is another question, im trying to understand resistors and capicators (topic for another day), i get the general jist of what they do, but when to use them? like why oh why is there a resistor going from the photoresistor to the ground wire? what is its purpose?if anyone could point me in the direction of something to clear some of the clouds in my head id be greatly appreciated, or if needed I can try to explain my confusion further..
The current can be measured indirectly by measuring the voltage across the fixed value resistor [...]
[...] you have no real way of measuring, unless you put another resistor in series.
In the first schematic the input pin will only see a voltage of +5. Input pins are high impedance (high resistance) so will not pull enough current through the LDR to get a measurable voltage drop.
In the second you have the input pin connected to GND so the input will always see 0V. There will be current flowing through the LDR but the input pin will never see a changing voltage.