|This article has links to websites or programs not trusted by Scratch or hosted by Wikipedia. Remember to stay safe while using the internet, as we cannot guarantee the safety of other websites.|
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.
List of hardware
Below is a list of hardware that Scratch can connect to:
LEGO WeDo 2.0
- 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. Scratch Link is Required 
- 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.
- Main article: Video Sensing
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.
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.
Micro:bit is a small computer which is able to be programmed. It was created in 2015 after being designed by the BBC. It has its own block language similar to Scratch but is also compatible with Scratch. Scratch Link is Required.
- Main article: Makey Makey
The Makey Makey allows you to turn objects that conduct electricity into keys, Even if they barely conduct electricity, like fruit. If there is conductivity, then the key is pressed.
- Main article: EV3
The EV3 Extension allows users to interact with the LEGO Mindstorms EV3 Robot. It supports the Touch, Gyro, Color, Ultrasonic, and Infrared sensors. It also supports motors. Scratch Link is required.
- Main article: LEGO BOOST Extension
The Lego Boost is another piece of hardware you can use with Scratch. It has motors, and light and tilt sensors. Scratch Link is required.
- Main article: Raspberry Pi
Scratch can use hardware connection features of the Raspberry PI computer. The version of Scratch for the raspberry PI has some exclusive features that allow you to use its hardware.
- Main article: Raspberry Pi Sense HAT Extension
The Sense HAT allows you to use the Sense HAT extension. You can measure temperature, air pressure, pitch, roll, and yaw. It also has a joystick. You can display text, costumes, and manually set pixels on its display.
|Caution:||DO NOT expose your PI to extreme conditions to test out its sensors. You could DAMAGE or DESTROY it.|
GPIO (General Purpose Input/Output)
- Main article: Raspberry Pi GPIO Extension
The GPIO allows you to measure if electricity is applied to a pin and also apply electricity to pins.
|Caution:||Improper use can damage or destroy your Raspberry Pi.|
Hardware that can no longer connect to Scratch
|This article or section documents something not included in the current version of Scratch (3.0). It is only useful from a historical perspective.|
Below is a list of hardware that used to be able to connect to Scratch but is no longer able to.
- Main article: PicoBoard
A PicoBoard is a piece of electronic equipment that allowed Scratch projects to interact with the outside world. It could sense light and sound, along with having a button and slider, and alligator clips. It was used with the () Sensor Value and Sensor ()? blocks. The PicoBoard is not supported by Scratch 3.0.
Lego WeDo 1.0
- Main article: LEGO Education WeDo Robotics Kit
The Lego Wedo version 1.0 was succeeded by Lego Wedo 2.0 in 2016 and is no longer supported by Scratch. It is usable in Scratch 2.0.
- Main article: JoyTail
With the JoyTail extension, Scratch can use remote sensor connections to connect to a joystick.
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.
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 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.