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Overview of Project 3 Slides are available at : Updated 1/28 Due Date for project has been extended to next Friday 2/6 Matthew Murach Project 3: The Wall For this project, you are hard coding a set path to avoid an oncoming wall.

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matthew murach

Overview of Project 3Slides are available at : 1/28Due Date for project has been extended to next Friday 2/6

Matthew Murach

project 3 the wall
Project 3: The Wall
  • For this project, you are hard coding a set path to avoid an oncoming wall.
  • The timing methods used from the last project will be used again in this project for distance estimation
  • If the code works the robot should detect the oncoming wall and pass-through the finish line
project 3 the wall3
Project 3: The Wall
  • For this project your code should be organized roughly as follows:

void right(){} /* do right turn */

void left(){} /* do left turn */

void forward(){} /* go forward 1 unit */

void backward(){} /* go backward 1 unit */

void main(){} /* Call series of directions */

  • For this project the distance to the wall is unknown. A persistent global variable should be declared to calculate the time needed by the robot to travel from start to finish.
distance algorithm
Distance Algorithm
  • The distance from start to finish is roughly 3 cells. So dividing the calibration time by 3.0 should yield the time to travel forward one cell.
  • Turn times should be hard coded
  • ****In addition to the original requirements the robot should be able to circumnavigate the wall with left or right openings.
wall navigation
Wall Navigation
  • When the robot hits the wall it should now implement the following pseudo-code.

If(hit){ /* test right for opening first default to right state*/



forward 1 U;


While (time < 1U){


if (hit) {

r_flag = 1 /* indicates no opening at right use left state */



forward 2 U;





project 3 the wall6
Project 3: The Wall
  • Basic robot parameters
  • The robot contains two motors and two sensors
  • To go forward both motors should be turned on i.e. fd(0) and fd(1)
  • To go right, the left motor should go forward and the right motor should go backward.

fd(0); /* left motor forward */

bk(1); /* right motor backward */

project 3 the wall7
Project 3: The Wall
  • There are times when a variable power level for the motor is desired. Using the motor() sub-function allows this.

motor(0,50); /* 50% of power for motor 0 in forward */

motor(0,-33); /* 33% power for motor 0 in reverse */

  • The usage of sensors is simple just place your sensors connections in a digital port. Operation is the same as before.
  • The motor should be connected as follows on the next slide
motor connection
Motor Connection




Pins 1 and 3 should be connected to the motor.

The bank of pins corresponding to each motor.

project 3 the wall9
Project 3: The Wall
  • Additional notes
  • Your machine should ONLY require one calibration period to run the course. Hard coding of distances is NOT permitted.
  • The robot should travel the length of the course and store this time as a global variable i.e.

persistent int a;

  • The robot after determining this value should run the course flawlessly…well maybe…
project 3 the wall10
Project 3: The Wall
  • This project will require the following.
  • Each design team consisting of 1-2 students should submit a brief 2-3 page report detailing the design and implementation that was chosen.
  • In addition, all C files needed for this project should be well commented and readable.
  • Also each team will be required to show that the design works 3 out of 4 times (this maybe increased) on the course.