The Arduino 101 board is a joint collaboration between Arduino and Intel®. It's powered by the Intel® Curie™ which features an x86 (Quark) and a 32-bit ARC architecture core. Bluetooth LE and a 6-axis accelerometer/gyro are built in. The board operates at 3.3V but the I/O pins are 5V tolerant. There are a total of 6 analog input pins and 14 digital I/O pins of which 4 (3, 5, 6, and 9) provide PWM output.

Read more about the Arduino 101

The first step is to upload arduino101-firmware.ino to the Arduino 101

###BLE

1. Launch the Scratch Device Manager app
2. Create a new project on https://kreg.scratch.ly
3. Go to More Blocks and click Add an Extension. Add the Arduino 101 Extension
4. Click Connect when the Scratch Device Manager pops up
5. When the indicator under More Blocks changes from yellow to green the extension is ready to use

###Serial over USB

1. Install the Scratch Browser Plugin for other browsers. Serial extensions work best in Firefox at the moment.
2. Open Firefox and navigate to the extension on ScratchX
3. When the indicator under More Blocks changes from yellow to green the extension is ready to use

Properties: Read, Write
Byte length: 3

Digital Write = [0x73, pin #, val]
Analog Write = [0x74, pin #, val]
Pin Mode = [0x75, pin #, mode]
Calibrate IMU = [0x76]
Servo Write = [0x77, pin #, degrees]

Properties: Read, Notify
Byte length: 6

Notification is sent when any of the analog input readings change.
Because of floating pins the values are usually constantly changing.

6 bytes that correspond with each analog pin (0-5)
byte[0] = analog pin 0 value , byte[1] = analog pin 1 value, etc...

Properties: Read, Notify
Byte length: 12

Notification is sent when any of the digital input readings change.
Only digital pins that have been set to input mode are updated.

12 bytes with index+2 corresponding with digital pins 2 through 13
byte[0] = digital pin 2 value, byte[1] = digital pin 3 value, etc...

Properties: Read, Write, Notify
Byte length: 12

Notification is sent when the mode of a digital pin is changed.

12 bytes with index+2 corresponding with digital pins 2 through 13
byte[0] = digital pin 2 mode, byte[1] = digital pin 3 mode, etc...

Properties: Read, Notify
Byte length: 4

X and Y axis are calculated using the Accelerometer and Gryo sensor values and the complementary filter.