Overview The kit has more than 16 projects for the beginners. This is the new SainSmart Sensor Starter Kit, developed specially for those beginners who are interested in Arduino. You will have a complete set of Arduino"s most common and useful electronic components. What"s more, we will offer you a detailed PDF tutorials including project introduction and their source code. You may learn about Arduino through using these basic projects. This kit will help you control the physical world with sensors. The SainSmart MEGA2560 R3 uses an ATMega16U2 instead of the ATMega8U2 chip. This allows for faster transfer rates and more memory. No drivers needed for Linux or Mac, and the ability to have the Uno show up as a keyboard, mouse, joystick, etc. It also adds SDA and SCL pins next to the AREF. In addition, there are two new pins placed near the RESET pin.The MEGA2560 R3 works with all existing shields but can adapt to new shields which use these additional pins.ns. About the HC-SR04, there are 4 pins out of the module: VCC , Trig, Echo, GND . So it"s a very easy interface for controller to use it ranging. We can calculated the distance easily: Distance = ((Duration of high level)*(Sonic:340m/s))/2 Package Content 1xMEGA2560 R3, 1xHC-SR04, 1x1Relay Module, 1xFlame Sensor Module, 1xShock-switch Sensor, 1xPhotosentitive Sensor, 1xHall Sensor, 1xJoystick, 1xMale-to-Male Cable, 1xWater Sensor, 1xTouch Sensor Module, 1xTemperatureSensor， 1xTemperature&Relative Humidity Sensor Module, 1xTracking Sensor Module, 5xPush Buttom Module, 1xActive Buzzer Module, 1xPassive Buzzer Module, 1xInfrared Receiver Module Note: Please download the tutorial & code via the below link: https://s3-ap-northeast-1.amazonaws.com/sain-amzn/20/20-013-143/sensor+kit.rar