it samples sensor after five minutes. If the sampling data is not upto the WET-level, irrigation system will continue to time five minutes; If the sampling data is upto the DRY-level, irrigation system will close the electromagnetic valve.
irrigation system will open the electromagnetic valve again , because irrigation system keep one hour that the sampling data is not upto the WET-level; The system will close the electromagnetic valve and turn on wrong-led , because it keep nine hour that the sampling data is not upto the WET-level.