The connector board can be used to connect up to four contact sensors to digital inputs or analog inputs (ADC), which work in range 0..5V or 0..3.3V.
The board has four connector groups, each of them with connectors 0V, In, +Pow.
For example, the board is suitable for home security system, with Infrared motion sensors PIR. Every PIR sensor has a power supply, which has to be connected to the +Pow connector of the board and normal closed contact, which has to be connected to the In connector of the board.
The board has two power supply connectors, so many boards can be connected cascade. The power supply connector has two power inputs: +Pow is for sensors power supply, which usual is 12V; +5V is needed to resistors located on the board;