Hi, My code sample some voltage data from a sensor via Pin A0. But It only displays zero insteat of a negative number when the voltage is negative. why? my code is as the following: int led =13; void setup(){ //initialize serial communication at 4800bit per second; Serial.begin(4800); pinMode …

cannot display a negative number

system October 14, 2012, 9:21pm 2

the command "print" can not return a negative number?

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