Introduce:  This kit emits ultrasonic waves from the ultrasonic module, and calculates the distance of the object in front by calculating the duration of the received echoes. The steering gear can be positioned at any angle within 0~180??, and the steering gear is equipped with an ultrasonic module to detect the distance of objects within 180 degrees around. The measurement results are output through the display screen and presented graphically, which is a very interesting small production of arduinoprojects.     Feature:  Detection range: 0-180.  Detection distance: 10-300cm.  (The error becomes larger for more than 3 meters).  Power input: USB power supply, 7~12V DC005V power socket input.  Appearance size: 165*95*85mm.  Net weight: 88g.     Package includes:  1 x DIY kit.  Component name: QTY. 1 x UNOR3 Development Board.  1 x UNOR3 expansion board.  1 x HC-SR04 Ultrasonic Ranging Module.  1 x 1.8 inch TFT LCD screen module.  1 x SG90 steering gear.  1 x Double female Dupont cable 20P.  1 x Square port USB cable.  1 x A set of wooden supports.  4 x Nylon column M3*8.  4 x Nylon column M3*18.  16 x M3*6 screws.  4 x M2*10 screws.  4 x M2 nut.