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Program Review: Wait for Green

The program shown below is sample code for making your robot wait until it sees the color green.

Hover on any block in the program to view a detailed explanation.

Wait Block Color Sensor - Compare - Color Stops the program from processing additional commands until the Color Sensor value is '3' (Green) Robot waits for a Green signal before continuing the program.

Move Steering Block On for Rotations Moves the robot forward. Note that the program can only reach this block after the "Wait for Color" block finishes. Moves forward (after Wait Block finishes)

Program Review: Wait for No Red

The program shown below is sample code for the RailRoad Crossing mini-challenge.

Hover on any block in the program to view a detailed explanation.

Wait Block Color Sensor - Compare - Color Stops the program from processing additional commands until the Color Sensor value is '0' (No Color) Robot waits for the red signal to go away before continuing the program.

Move Steering Block On for Rotations Moves the robot forward. Note that the program can only reach this block after the "Wait for Color" block finishes. Moves forward (after Wait Block finishes)

Program Review: Forward to Stop Line

The program shown below is sample code for 'Forward to Stop Line' mini-challenge. The program assumes that the robot is running on a white table, looking for a black line.
First, the robot starts its motor to move forward, and when the color sensor sees the color black, the robot stops the motor.

Hover on any block in the program to view a detailed explanation.

Move Steering Block On Turns Motors B+C On at 50% Power Starts moving the robot forward. Another Move or Motor command will need to stop them later.

Wait Block Color Sensor - Compare - Color Stops the program from processing additional commands until the Color Sensor value is '1' (color black) Robot waits until the Color Sensor sees the color black before continuing the program.

Move Steering Block Off Turns Motors B+C Off, and sets them to a Braking state Stops the robot. Note that the program can only reach this block after the "Wait for Color" block finishes.