This is  a universal sensor adapter V2.0, it can be used together with digital input modules or analog input module. Compared with previous version, we add a 10K resistor between A & B, A & C respectively,so that you don't need to connect addition resistors as the sensor has build-in a pull-up or pull-down resistor.  Why need a pull-up or pull down resistor, please refer to http://blog.makezine.com/2009/03/05/understanding-pullup-and-pulldown-r/ . 

 

Generally speaking, this terminal provides a much easier way to connect a switch or any modules that requires pull-up/down resistor  to microcontroller. 

 

 

 

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