#Vex limit switch programming serial#
#Vex limit switch programming code#

In addition, the default program supports two auxiliary motors which should be plugged into ports 4 and 5. If you wish to use the program unchanged, you will need to plug your drive motors into these ports. The default Vex program that you will be using is configured so the left drive motor is on port 2 and the right drive motor is on port 3. Notice that the black wire is on the outside. They plug into the Arduino board like this: The black wire is ground, the red is power and the white is signal. If we take a look at the connector on the motor, this is what we see: Notice that since the power connection is in the middle, plugging the motor in backwards will not cause any serious damage, although it will not work. Here we can see that each port has 3 connections, one for ground, one for power and one for the PWM signal which controls the speed and direction of the motor. LetвЂ™s take a closer look at the connector: Pins 10 through 13 supply 5 volts an should be used for sensors or low voltage servos. Pins 2 through 9 support 7.2 volt motors such as the Vex motors. The pins are numbered from 2 to 13 as shown below. The Arduino provides 12 servo style PWM outputs, each of which can control one Vex motor or servo.

#Vex limit switch programming serial#

The two devices communicate via serial ports. The robot controller consists of a Raspberry Pi 3 which handles the high level Java program and an Arduino which handles the low level device control. Watch the вЂњRobot Decision MakingвЂќ video (should be included with this webinar.This section provides a guide for wiring and programming your Vex based robot.Repeat while the limit switch is not pressed. Then program the motors to turn off and the LED to turn on until the potentiometer value is less than 2048. Program 2: Program the left and right motors to spin forward until the potentiometer value is greater than 2048.

Program 1: Program the right motor to spin forward for 3 seconds, then reverse for 3 seconds, forever.

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Repeat while the limit switch isnвЂ™t pressed. Then program it to spin in reverse until the potentiometer value is less than 2048.

Example 3: Program the right motor to spin forward until the potentiometer value is greater than 2048.

Example 2: Expand the previous program to loop only while the limit switch is not pressed.

Example 1: Program the green LED to repeatedly turn on for 2 seconds, then off for 2 seconds, forever.

Statements that can be only true or false are called Boolean statements, and their true-or-false value is called a truth value.

Commands placed between the curly braces will repeat while the (condition) is true when the program checks at the beginning of each pass through the loop.Д«oolean Logic Decisions robots make must always based on questions which have only two possible answers: yes or no, true or false.

The condition is checked every time the loop repeats, before the commands between the curly braces are run.

While the condition is true, the while loop repeats when the condition is false, the while loop ends and the robot moves on in the program.

The condition controls how long or how many times a while loop repeats.

Every while loop begins with the keyword вЂњwhileвЂќ.

There are three main parts to every while loop.

#Vex limit switch programming code#

A while loop is a structure within ROBOTC which allows a section of code to be repeated as long as a certain condition remains true.