This touch sensor (dimensions 15x15x5 mm) is built into a semi-transparent building block. There are two versions, both of which are powered with a so-called Dupont plug. The stone with the black connector has a momentary function (push button) and only emits an active signal during the touch, the stone with the blue connector has a switching function and switches on when touched and 'off' again when touched a second time. With an 'active' output signal (5 volts), a red LED lights up in this transparent sensor stone.
To connect the version with the Dupont connector, a three-pole servo cable (with the + on the middle wire) can be used if it is powered by the Dupont Power Module.
Please note that the order of the pins in the connector on the sensor side of the cable will have to be changed manually.
This sensor has the signal output on the middle pin and can be damaged if it is connected incorrectly!
The sensor with the black connection strip behaves like a push button and is only 'active' when touched. The sensor with the blue connection strip has a changeable function and remains 'active' after the first touch. With a second touch, the output signal becomes 'inactive' again. The output signal follows the common 'positive logic', so without detection it is zero volts and is then considered a LOW, upon detection the output becomes HIGH with a voltage level of approximately 3.5 volts.
Important: note that the middle pin of the three-pin Dupont plug with these sensors is not, as usual, used for the + pole of the supply voltage. When using prefabricated servo cables, the pin order on the sensor side must be changed!
The non-transparent touch sensor brick (see photo to the right) contains the same touch sensor as semi-transparent flat sensor bricks. As a result, the sequence of connection pins in the three-pole cable is exactly the same as already outlined above.
If you have the brick with the red sensor face to the right, and the connections to the left, in front of you, the top connection is the +5 volts and the bottom connection is the minus. The signal comes out on the middle pin of the cable.
Standard servo cables usually have the + pin in the middle. Contact pins of a standard servo cable, by slightly lifting the small plastic tab in the plug that holds the pin, can be easily removed from the plastic plug section after which you can reverse the wires to make a correct connecting lead.
