I'm using arduino mini pro. 4 ADC ( A0, A1, A2 A3, ) to convert LDR( light dependent resistor) voltage to digit. The circuit is like this 5v---5.6K--@--LDR----GND. the measure( ADC) is at @ point. seems four converted value are interference each other. the program read A0, A1, A2, A3 one by one. if…

ADC cross-interference

CrossRoads June 2, 2014, 7:24pm 2

Read each Ax twice, use the 2nd reading. Gives the data time to settle.

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