The water pump switcher on off by water level flag. The red circuit is low level and, the yellow circuit is high level. The pump will only turn on when the mid-level (green) switch is disarmed. Once it reaches the high level (yellow), it turns off the pump. This cycle will repeat continuously while the blue led and sensor (after emissor) indicates the presence of water in the pipe. Otherwise, the relay will be turn off and a red led will turn on by lack of water. In the relay switch we can use any until 10A alternating source.
