In this lesson, we will use the Touch LED to display green while the robot is driving forward, tap to stop, then display red when stopped.
Step 1: Open VEXcode Project
Open the "MoveUntilTouch" VEXcode project you created in the Robot Configuration page. VEXcode IQ
Step 2: Add Set TouchLED Color Block
From the Looks Palette, drag a “set [SideLED] color to (none)” block. Set the color to green. Add Set LED Color Block
Step 3: Add a Drive Forward Block
Drag a “drive [forward]” block to your program.Add Drive Forward Block
Step 4: Add Wait Until Block
From the Control Block Palette, drag a “wait until” block to your program.Add Wait Until Block
Step 5: Add TouchLED Boolean Block
From the Sensor Palette, draw a “[SideLED] pressed?” block to your program. Place it inside the “wait until” block. Add Touch LED Block
Step 6: Add Second Set TouchLED Color Block
From the Looks Palette, drag a “set [SideLED] color to (none)” block. Set the color to red. Add Second Touch LED Color Block
Step 7: Add Stop Driving Block
Drag a “stop driving” block to your program. Add Stop Driving Block
Step 8: Download and Run
Tap the Touch LED at any time while the robot is moving forward. Make sure your robot is connected to your programming device, download and then run the program.
Download and run
Step 9: Observe
After running the program, the LED displays green and the robot moves forward. When the Touch LED is touched, the LED turns red and the robot stops.
Did You Know? Using Signals
Having a way to tell where the robot is in a program can be really helpful, especially when troubleshooting. Programmers often use different types of signals between behaviors so that it is clear where the robot is reading the program and what it is executing. We can use the Touch LED as a signal for this purpose. We just used the LED to show green while moving forward and red when stopped. Adding Signals
.gif)
.gif)
.gif)
.gif)
.gif)
.gif)
