Create Gyroscope.md

Author: flavioheleno

Gyroscope.md

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+# Gyroscope
+
+I have a GY-521 (MPU-6050) shield that has both an accelerometer and a gyro in a single chip.
+
+According to a few different links[[1](http://dummyscodes.blogspot.com.br/2014/07/mpu6050-gy-521-breakout-arduino-mega.html)][[2](http://forum.arduino.cc/index.php?topic=166113.0)] this shield has an onboard voltage regulator for 3.3V, which means that you can connect it to Arduino's 5V output without problems.
+
+I'm using [I2CDevLib](https://github.com/jrowberg/i2cdevlib) to work with this shield, more specifically [this](https://github.com/jrowberg/i2cdevlib/tree/master/Arduino/I2Cdev) and [this](https://github.com/jrowberg/i2cdevlib/tree/master/Arduino/MPU6050).
+
+## Connections
+
+Shield | Arduino
+-------|--------
+VCC    | 5V
+GND    | GND
+SCL    | Pin 21 (SCL)
+SDA    | Pin 20 (SDA)
+INT    | Pin 2 (interrupt 0)
+
+## Testing
+
+You can user [I2C Scanner](http://playground.arduino.cc/Main/I2cScanner) to check if the shield communication with your arduino is working properly.
+
+The scanner will scan all I2C devices and report to the Serial Monitor.
+
+```
+I2C Scanner
+Scanning...
+I2C device found at address 0x68  !
+done
+```
+
+## Interrups
+
+According to Arduino's [reference](http://arduino.cc/en/Reference/AttachInterrupt), Mega 2560 has 6 pins that can be used for interrupts: 2, 3, 18, 19, 20 and 21.