SainSmart 20 Sensor Modules Education Starter Kit with 1 Relay Module + HC-SR04 Distance Sensor for Arduino UNO MEGA2560 R3 Duemilanove Robot

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.

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. The all process is: pull the Trig pin to high level for more than 10us impulse, the module start ranging; finish ranging, If you find an object in front, Echo pin will be high level, and based on the different distance, it will take the different duration of high level. So we can calculated the distance easily: Distance = ((Duration of high level)*(Sonic:340m/s))/2

Package Content

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.zip