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Scratch can connect to some real world hardware. Some of the features are natively built in, while some are added through an extension or modification.

Hardware Scratch can Connect to

Below is a list of hardware that Scratch can connect to:

PicoBoard

Main article: PicoBoard

A PicoBoard is a piece of electronic equipment that allows Scratch projects to interact with the outside world. It can sense light and sound, along with having a button and slider, and alligator clips. It is used with the () Sensor Value and Sensor ()? blocks.

LEGO WeDo

Main article: LEGO Education WeDo Robotics Kit

The LEGO Education WeDo Robotics Kit is a simple robotics tool designed for ages 7–11. It allows users to design their own robots, and then program the robots using drag-and-drop software like Scratch. In Scratch, the Motor Blocks can control the robot's motor, turning it on or off, changing the power or direction.

GoPiGo Raspberry Pi Robot

Main article: Dexter_Industries_GoPiGo_For_Raspberry_Pi
Gopigo Raspberry Pi Robot In Scratch.png

With the GoPiGo you can control a Raspberry Pi robot with Scratch Programming. Scratch can be used to control the robot motors, LEDs, and sensors.

Microphone

Main article: Loudness (value)

If a microphone is connected to the computer, Scratch can sense the volume of the sound from the microphone, on a scale of 0-100. If no microphone is connected, it is 0 or -1. The Loudness block contains the value.

Webcam

Main article: Watch Me Move!

In Scratch 2.0, a new feature was added that allows Scratchers to use Microsoft Kinect-like features in Scratch. The video feed can be shown on the stage (with transparency), and the motion of the video can be obtained as well.

Joystick

Main article: JoyTail

With the JoyTail extension, Scratch can use remote sensor connections to connect to a joystick.

Arduino Board

Main article: Catenary

With the Catenary extension, an Arduino board can be controlled through Scratch. This project was being made by Chalkmarrow, but never seems to have been completed.

LEGO Mindstorms NXT

LEGO Mindstorms NXT is a programmable robotics kit released by LEGO in late July 2006, as a successor to the now obsolete RCX kit. The main component in the kit is a brick-shaped computer called the NXT Intelligent Brick. The Scratch modification Enchanting can be used to program LEGO NXT robots.

Finch

Finch is a small simple robot for computer science education designed by Carnegie Mellon's CREATE lab. It is powered via a USB cable. It can be easily connected to Scratch via a helper application, the "BirdBrain Robot Server".

Hummingbird

Hummingbird is a robot created for education in 2010 by BirdBrain Technologies. It is powered via a USB cable. Like the Finch, it is easily connected to Scratch via BirdBrain Robot Server.