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Home Automation with Amazon Echo voice control
Add Amazon Echo voice contr...View Instructable »
Edison and Arduino/Genuino 101 wireless weather station
Both reistors are required to make the voltage change. Read on to this section which explains what's going on: "As the light level increases the resistance drops, which makes the current increase (by Ohm's Law), which in turn, makes the voltage at A0 (Va0) increase."As both resistors are in series the same current must flow through them both. The LDR resistance drops with light, which causes the current in both resistors to increase (I=V/R), and therefore the voltage across the other (non-LDR) increases.
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