Hi
Using an Arduino controller or a PIC the input pins are rated at maximum 5v, if i am correct here. I am building a circuit that will be using a Arduino as a controller. So one of the circuits job is to measure a voltage that varies between 10-20 VDC. I am planning to use a voltage divider to scale that voltage down to little below 5 volts. The problem is in a case where lets say i lose the ground on the voltage divider while the voltage input to the divider is 20V, it will now damage the PIC because the voltage is 20 at the arduino input pin. The question is, if the PIC/arduino input does not consume any current why does a voltage higher then 5v damage the PIC ???.
Is there a protection solution to my case ??
Using an Arduino controller or a PIC the input pins are rated at maximum 5v, if i am correct here. I am building a circuit that will be using a Arduino as a controller. So one of the circuits job is to measure a voltage that varies between 10-20 VDC. I am planning to use a voltage divider to scale that voltage down to little below 5 volts. The problem is in a case where lets say i lose the ground on the voltage divider while the voltage input to the divider is 20V, it will now damage the PIC because the voltage is 20 at the arduino input pin. The question is, if the PIC/arduino input does not consume any current why does a voltage higher then 5v damage the PIC ???.
Is there a protection solution to my case ??