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AUTOMATION WITH ROBOTC Starting to write and troubleshoot computer code.

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Presentation on theme: "AUTOMATION WITH ROBOTC Starting to write and troubleshoot computer code."— Presentation transcript:

1 AUTOMATION WITH ROBOTC Starting to write and troubleshoot computer code


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

7 SPECIAL  Commands that control the more unique VEX Hardware – LED’s and Flashlights

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 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?

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

15 YOUR WARM UP PROGRAM 1. Write a program so that a motor turns on when the limit switch is pressed. 2. After 2 ½ seconds have that motor turn off and the other motor turn on in the opposite direction 3. Press the bump switch to turn off the second motor.


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 task main() { untilPotentiometerGreaterThan(3500, in2); startMotor(rightMotor, 127); waitInMilliseconds(3000); stopMotor(rightMotor); } POTENTIOMETER PROGRAM ANSWER

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 task main() { startMotor(rightMotor, 127); untillight(100, in1); stopMotor(rightMotor); } LINE TRACKER PROGRAM ANSWER

27 OPEN SYSTEM  An open system will let you unplug your cortex from the computer and run your program repeated times.

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