I seem to get corruption on my display soon as i connect resistor to inputs A1-A5. im using 10k resistor planning on float switches to them but i cant even put a resistor in the input other end in the air with out display showing random numbers.My setup is i2c LCD, I2c RTC, temp probe 1 wire dallas. i2c expansion module pcf8574. also Atlas PH stamp . they all seems to work fine no conflicts. just cant use my inputs. is it possible my inputs are bad on the board? this is 1st thing ive had hooked up to them so shouldnt be damaged by me.
i cant even put a resistor in the input other end in the air with out display showing random numbers.
Quotei cant even put a resistor in the input other end in the air with out display showing random numbers.Indeed - that is what one should expect of a floating input, it will pick up the nearby signals because its extremely high impedance(in fact approximately infinite impedance at lower frequencies). Your resistor is acting as a capacitive probe to nearby wiring.Connect the other end of the resistors to something sensible and the inputs will no longer float.
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