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Author Topic: oscillating value for 5V on analog input  (Read 353 times)
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yan_g
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« on: June 07, 2012, 12:42:20 pm »
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hello,

when i plug the arduino 5V to an analog input i should get a steady reading of 1023, right? the thing is i get 1023 most of the time but the value randomly drops to 1022. what can i do to fix this? is it normal (never noticed it before)?

thanks
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CrossRoads
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« Reply #1 on: June 07, 2012, 12:45:44 pm »
 Bigger Bigger Smaller Smaller Reset Reset
Whenever the voltage varies by 0.00488V, the digital reading changes by 1.
Try putting a 0.1uF cap from the input pin to ground to steady the voltage.
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