Problem with teensy

Other Hardware 3rd Party Boards
2

try this:

void setup() {
 
  for(int i = 0; i < 4; i++)
  {
    pinMode(pins[i], INPUT);
   digitalWrite(pins[i], HIGH);
  }
}

The digialWrite enables a pull up resistor on the input. Without it the pin will be floating around picking up the local radio station or the neighbor's microwave oven.