Move To Color

Introduction

This tutorial shows how to move the EV3 driving base until the color sensor detects a color.

Here are the building instructions for the robot:

• EV3 driving base
• Color sensor down

Step 1 Run code on button pressed

Drag ||brick:on button pressed|| block so that your code starts when the enter button is pressed (and not at the start). We are also using the ||brick:show string|| message easily diagnose if the program does not work.

brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
    brick.showString("started", 1)
})

Step 2 Turn on the motors

Drag a ||motors:steer motors B+C|| block under the button pressed event. This will turn on both motors.

brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
    brick.showString("started", 1)
    motors.largeBC.steer(0, 50)
})

Step 3 Pause until color

Drag a ||sensors:pause until color detected|| block after the steer and select the color you want to detect. This block will stop the program until the color is detected.

brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
    brick.showString("started", 1)
    motors.largeBC.steer(0, 50)
    brick.showString("looking for red", 1)
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Red)
})

Step 4 Stop the motors!

Once the color is detected, the program will continue to run blocks. Drag a ||motors:stop B+C motor|| so that both motors stop.

brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
    brick.showString("started", 1)
    motors.largeBC.steer(0, 50)
    brick.showString("looking for red", 1)
    sensors.color3.pauseUntilColorDetected(ColorSensorColor.Red)
    brick.showString("stop", 1)
    motors.largeBC.stop()
})

Step 5

Download your program to your brick and try it out!