Add a read-the-gpio-value function

[Ronan Guilloux]

[Tim Joosten]

/**
 * Read pin value.
 * 
 * @param int, $pinNo
 * @return bool|string
  */
 public function readValuePin($pinNo) {
     if (!$this->isValidPin($pinNo)) {
         return false;
     }

     return trim(file_get_contents(GpioInterface::PATH_GPIO.$pinNo.'/value'));
}

in this way?

[Tim Joosten]

@ronanguilloux ?