1. Automation with RobotC
Starting to write and troubleshoot computer code

2. Open a New File

3. Review of Robot C
When you open a new file in Robot C, you must go to the “MOTORS and SENSORS SETUP” page before you write your code

4. Review of Robot C
Once your new file is open, remember that your program code always needs to be written between the two curly brackets on the screen

5. Natural Language commands
We will only use 4 of the Natural Language commands when we program, but each of these commands has a number of choices

6. Movement Commands that allow you to control individual motors
GTT kits do not include Servo motors – so make sure students do not use that option.
Commands that allow you to control individual motors

7. Special
Commands that control the more unique VEX Hardware – LED’s and Flashlights
Flashlights not in GTT kits.

8. Until
Commands that allow you to create behaviors where the robot acts “until” a certain event. For example,
Button Press
Potentiometer Value

9. Wait
Commands that wait for an elapsed amount of time. The next command will run after the timer is done.

10. ROBOTC Practice Program
Presentation Name
Course Name
Unit # – Lesson #.# – Lesson Name
ROBOTC Practice Program
You may notice warnings or errors.
Make sure you spell motor and sensor names exactly as defined in Motors and Sensors setup.
A ; is needed at the end of each line of code.
Don’t forget every open parenthesis needs a closing parenthesis.
What is wrong with line 31?
Encourage students to read the error descriptions for suggestions on how to fix their program.
Once errors are fixed. Compile, download and run the program again.
Line 31 – closing parenthesis is in wrong place – goes after the -63)

11. What’s Wrong with this code?
Missing the semicolon.

12. Why won’t the motor stop?
Should say “leftMotor”, not “rightMotor”.

13. Why won’t the LED turn on?
There is nothing between the “Turn on” and “Turn Off” commands, so the LED doesn’t stay on at all.

14. Digital Switches BUMP SWITCH LIMIT SWITCH
Digital Switches are either ON or OFF. The command that will always work for these switches is “untilBump”
BUMP SWITCH
LIMIT SWITCH

15. Press the bump switch to turn off the second motor.
Presentation Name
Your warm up Program
Course Name
Unit # – Lesson #.# – Lesson Name
Write a program so that a motor turns on when the limit switch is pressed.
After 2 ½ seconds have that motor turn off and the other motor turn on in the opposite direction
Press the bump switch to turn off the second motor.
Have students try to solve this without showing the sample solution first.

16. Practice Program Answer

17. Analog Switches
The Potentiometer and Line Tracker work on a scale of 0 – 4095
POTENTIOMETER
LINE TRACKER

18. Potentiometer The Potentiometer works on a scale of 0 – 4095
It is very sensitive, and it is NOT meant to turn all the way around, so please don’t force it!

19. Potentiometer Position = a number between 0 and 4095
sensorPort = in2 or potentiometer

20. Analog Switches
Write a code for the potentiometer that turns on a motor for 3 seconds when you turn it past 3500
POTENTIOMETER

21. Potentiometer Program Answer
task main() {
untilPotentiometerGreaterThan(3500, in2);
startMotor(rightMotor, 127);
waitInMilliseconds(3000);
stopMotor(rightMotor); }

22. ROBOTC Debugger
When I write a code with a potentiometer, I need to see what the sensor is reading right now. We do this by looking at a “Debugger” window.

23. ROBOTC Debugger
After you click on “Compile Program”, open the Sensor Debug window by going to Robot > Debug Windows > Sensors

24. Line tracker Position = a number between 0 and 4095
sensorPort = in1 or lineTracker

25. Line tracker The line tracker senses light and dark.
Right a program that turns on a motor, and has it stop when you cover the line tracker with your finger.

26. Line tracker Program Answer
task main() {
startMotor(rightMotor, 127);
untillight(100, in1);
stopMotor(rightMotor); }

27. Open System
An open system will let you unplug your cortex from the computer and run your program repeated times.