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By using electronic bricks, you can connect Arduino easily with various digital, analog and I2C/Uart interfaces. These connections are prepared to extensive modules like potentiometers, sensors, relays, servos...even buttons, just plug and play.
Each terminal module has buckled port with VCC, GND and Output, which has corresponding port on the sensing board, with a plain 2.54mm dual-female cable you may start playing already. Make the connections easier, secure and more professional looking.