Introduction: Relay

Galileo is a micro controller board based on the Intel® Quark SoC
X1000 Application Processor, a 32-bit Intel Pentium-class system on a chip (datasheet). It’s the first board based on Intel® architecture designed to be hardware and software pin-compatible with Arduino shields designed for the Uno R3. Digital pins 0 to 13 (and the adjacent AREF and GND pins), Analog inputs 0 to 5, the power header, ICSP header, and the UART port pins (0 and 1), are all in the same locations as on the Arduino Uno R3. This is also known as the Arduino 1.0 pinout.

Galileo is designed to support shields that operate at either 3.3V or 5V. The core operating voltage of Galileo is 3.3V. However, a jumper on the board enables voltage translation to 5V at the I/O pins. This provides support for 5V Uno shields and is the default behavior. By switching the jumper position, the voltage translation can be disabled to provide 3.3V operation at the I/O pins.

Of course, the Galileo board is also software compatible with the Arduino Software Development Environment (IDE), which makes usability and introduction a snap. In addition to Arduino hardware and software compatibility, the Galileo board has several PC industry standard I/O ports and features to expand native usage and capabilities beyond the Arduino shield ecosystem. A full sized mini-PCI Express slot, 100Mb Ethernet port, Micro-SD slot, RS-232 serial port, USB Host port, USB Client port, and 8MByte NOR flash come standard on the board.

Step 1: Things Needed

You will need the following parts:

1x Breadboard

1x Galileo

2x LEDs

1x Relay (SPDT)

14x Jumper Wires

Step 2: Code

Code To Note


You’ll communicate with the shift register (and a lot of other parts) using an interface called SPI, or Serial Peripheral Interface. This interface uses a data line and a separate clock line that work together to move data in or out of the Galileo at high speed. The MSBFIRST parameter specifies the order in which to send the individual bits, in this case we’re sending the Most Significant Bit first.


Bits are the smallest possible piece of memory in a computer; each one can store either a “1” or a “0”. Larger numbers are stored as arrays of bits. Sometimes we want to manipulate these bits directly, for example now when we’re sending eight bits to the shift register and we want to make them 1 or 0 to turn the LEDs on or off. The Galileo has several commands, such as bitWrite(), that make this easy to do.

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