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About FAQ Projects GitHub Troubleshoot EV3 Manager Bluetooth Forum LEGO Support FIRST LEGO League
Reference
show string show number show value show mood show image clear screen show ports on event is pressed was pressed pause until set light battery level
run stop reset set brake set inverted set regulated tank steer angle speed clear counts stop all motors
on event pause until is pressed was pressed
angle rate reset
on event distance pause until
on event distance pause until
on event pause until is pressed was pressed set remote channel
on color detected pause until color detected on light detected pause until light condition detected color light
play sound effect play sound effect until done play tone ring tone stop all sounds rest change tempo by set tempo note frequency beat set volume
seconds millis reset pause until
log log value send to screen
Blocks
On Start
repeat for while for of
if Boolean
assign change var var
Math JavaScript blocks Custom blocks
Python
Calling Sequencing Variables Operators Statements Functions Classes
JavaScript
Calling Sequencing Variables Operators Statements Functions Types Classes Interfaces Generics
Types
Number String Boolean Array Function
Developers
Command Line Interface Visual Studio Code support Blocks Embed
Getting Started
Try Use
Tutorials
Wake Up! Make An Animation What Animal Am I? Music Brick Run Motors Tank ZigZag Touch to Run Touch Sensor Values What Color? Line Following Red Light, Green Light Reflected Light Measure Reflected Light Calibration Object Near? Security Alert
Coding
Autonomous Parking Object Detection Line Detection
Design Engineering
Make It Move Without Wheels Make It Smarter and Faster Make a System that Communicates
Maker
Make a Sound Machine Make a Security Gadget
Documentation
About FAQ Projects GitHub Troubleshoot EV3 Manager Bluetooth Forum LEGO Support FIRST LEGO League
Reference
show string show number show value show mood show image clear screen show ports on event is pressed was pressed pause until set light battery level
run stop reset set brake set inverted set regulated tank steer angle speed clear counts stop all motors
on event pause until is pressed was pressed
angle rate reset
on event distance pause until
on event distance pause until
on event pause until is pressed was pressed set remote channel
on color detected pause until color detected on light detected pause until light condition detected color light
play sound effect play sound effect until done play tone ring tone stop all sounds rest change tempo by set tempo note frequency beat set volume
seconds millis reset pause until
log log value send to screen
Blocks
On Start
repeat for while for of
if Boolean
assign change var var
Math JavaScript blocks Custom blocks
Python
Calling Sequencing Variables Operators Statements Functions Classes
JavaScript
Calling Sequencing Variables Operators Statements Functions Types Classes Interfaces Generics
Types
Number String Boolean Array Function
Developers
Command Line Interface Visual Studio Code support Blocks Embed
Getting Started
Try Use
Tutorials
Wake Up! Make An Animation What Animal Am I? Music Brick Run Motors Tank ZigZag Touch to Run Touch Sensor Values What Color? Line Following Red Light, Green Light Reflected Light Measure Reflected Light Calibration Object Near? Security Alert
Coding
Autonomous Parking Object Detection Line Detection
Design Engineering
Make It Move Without Wheels Make It Smarter and Faster Make a System that Communicates
Maker
Make a Sound Machine Make a Security Gadget

Red Light, Green Light

Introduction

Use the ||sensors:pause until color sensor detected|| block to play Red Light, Green Light with your LEGO® MINDSTORMS® Education EV3 robot!

Brick simulation with color sensor and motors

Step 1

Open the ||sensors:Sensors|| Toolbox drawer. Drag out 2 ||sensors:pause until color sensor detected|| blocks onto the Workspace, and drop them into the ||loops:forever|| loop.

forever(function () { 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Blue) 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Blue) 
})

Step 2

In the first ||sensors:pause until color sensor detected|| block, use the second drop-down menu to select the Green color. In the second ||sensors:pause until color sensor detected|| block, use the second drop-down menu to select the Red color.

Color selection dropdown

forever(function () { 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Green) 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Red) 
})

Step 3

Open the ||motors:Motors|| Toolbox drawer. Drag out a ||motors:tank motors|| block onto the Workspace, and drop in between the ||sensors:pause until color sensor detected|| blocks.

forever(function () { 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Green) 
    motors.largeBC.tank(50, 50) 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Red) 
})

Step 4

Open the ||motors:Motors|| Toolbox drawer. Drag out a ||motors:stop all motors|| block onto the Workspace, and drop it in after the second ||sensors:pause until color sensor detected|| block in the ||loops:forever|| loop.

forever(function () { 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Green) 
    motors.largeBC.tank(50, 50) 
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Red) 
    motors.stopAll() 
})

Step 5

Now, plug your EV3 Brick into the computer with the USB cable, and click the Download button at the bottom of your screen. Follow the directions to save your program to the EV3 Brick.

Attach a Color Sensor to Port 3 and attach your EV3 Brick to a driving base with Large Motors attached to Ports B and C. See the building instructions for: Driving Base with Color Sensor Forward. Test your program by putting a green or red piece of paper or LEGO brick in front of the Color Sensor.

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