/*****************************************************************
* Arduino Controlled Servo Robot
(SERB) - Whisker Avoidance *
* For more details visit:
http://www.oomlout.com/serb *
*
*
* Behaviour: Uses two wire whiskers,
to bump into obstacles and *
* change direction
accordingly. It will poll the *
* whiskers and when one is
found to be tripped it *
* will reverse for 500
milliseconds then *
* turn randomly left or
right for a random time *
* between 300 and 1500
milliseconds *
*
*
* Wiring: --Arduino Controlled Servo
Robot-- *
* Right Servo Signal - pin
9 *
* Left Servo Signal - pin
10 *
* --Whisker Wiring--
*
* right whisker - pin 6
*
* left whisker - pin 7
*
* whisker common - ground
*
*
*
* License: This work is licenced under
the Creative Commons *
* Attribution-Share Alike 3.0
Unported License. To *
* view a copy of this
licence, visit *
*
http://creativecommons.org/licenses/by-sa/3.0/ *
* or send a letter to
Creative Commons, 171 Second *
* Street, Suite 300, San
Francisco, California 94105, *
* USA.
*
*
*
****************************************************************/
//----------------------------------------------------------------
// START OF WHISKER PREAMBLE
#define RIGHTWHISKER 6 //the pin the
right whisker is attached to
#define LEFTWHISKER 7 //the pin the
left whisker is attached to
//----------------------------------------------------------------
// START OF ARDUINO CONTROLLED SERVO
ROBOT (SERB) PREAMBLE
#include
#define LEFTSERVOPIN 10 //The pin the
left Servo is connected to
#define RIGHTSERVOPIN 9 //The pin the
right Servo is connected to
#define MAXSPEED 30 //due to the way
continuous rotation servos
//work maximum
speed is reached at a much
//lower value than
90 (this value will change
//depending on
your servos) (for Parallax servos)
//20 will give you
full range 10 makes it very
//controllable but
a little slow
Servo leftServo;
Servo rightServo; ;
int leftSpeed; //sets the speed
of the robot (left servos)
//a percentage
between -MAXSPEED and MAXSPEED
int rightSpeed; //sets the speed
of the robot (both servos)
//a percentage
between -MAXSPEED and MAXSPEED
int speed = 100; //used for simple
control (goForward etc.)
//a percentage
between 0 and MAXSPEED
// END OF THIS PROGRAMS PREAMBLE
//----------------------------------------------------------------
void setup()
{
Serial.begin (9600); //Starts the
serial port
serbSetup(); //adds the
servos and prepares all
//SERB related
variables
whiskerSetup();
}
/*
* The main loop
* Sends the robot forward then checks
it's whiskers, if one is pressed
* the robot will reverse then turn and
head forward once more
*/
void loop()
{
goForward(); //sends the robot
forward
checkWhiskers(); //checks to see if
a whisker is pressed
}
//------------------------------------------------------------------------
//START WHISKER ROUTINES
void whiskerSetup()
{
pinMode(RIGHTWHISKER, INPUT);
//Sets the right whisker's pin to be an input
pinMode(LEFTWHISKER, INPUT);
//Sets the left whisker's pin to be an input
digitalWrite(RIGHTWHISKER,
HIGH);//Sets the right whisker pin's internal pullup
//resistor (this means the pin is high when
//there is no signal attached and reads low
//when a negative signal is attached
digitalWrite(LEFTWHISKER,
HIGH);//Sets the left whisker pin's internal pullup
//resistor
}
void checkWhiskers()
{
if(!digitalRead(RIGHTWHISKER)){reverseAndTurn();} //if the right
whisker is pressed
//then reverse and turn
if(!digitalRead(LEFTWHISKER)){reverseAndTurn();} //if the left
whisker is pressed
//then reverse and turn
}
void reverseAndTurn()
{
goBackward(); //goes backward
delay(500); //for half a
second
turnRandom(300,1500); //turns randomly
for a time between 300 and 1500 milliseconds
}
//END OF WHISKER ROUTINES
//------------------------------------------------------------------------
//------------------------------------------------------------------------
//START OF ARDUINO CONTROLLED SERVO
ROBOT (SERB) ROUTINES
/*
* sets up your arduino to address your
SERB using the included
* routines
*/
void serbSetup(){
setSpeed(speed);
pinMode(LEFTSERVOPIN, OUTPUT);
//sets the left servo signal pin
//to output
pinMode(RIGHTSERVOPIN, OUTPUT);
//sets the right servo signal pin
//to output
leftServo.attach(LEFTSERVOPIN);
//attaches left servo
rightServo.attach(RIGHTSERVOPIN);
//attaches right servo
goStop();
}
/*
* sets the speed of the robot between
0-(stopped) and 100-(full speed)
* NOTE: speed will not change the
current speed you must change speed
* then call one of the go methods
before changes occur.
*/
void setSpeed(int newSpeed){
if(newSpeed >= 100) {
newSpeed = 100;
} //if speed is greater than 100
//make it 100
if(newSpeed <= 0) {
newSpeed = 0;
} //if speed is less than 0
make
//it 0
speed = newSpeed * MAXSPEED / 100;
//scales the speed to be
//between 0 and MAXSPEED
}
/*
* sets the speed of the robots
rightServo between -100-(reversed) and 100-(forward)
* NOTE: calls to this routine will
take effect imediatly
*/
void setSpeedRight(int newSpeed){
if(newSpeed >= 100) {
newSpeed = 100;
} //if speed is greater than 100
//make it 100
if(newSpeed <= -100) {
newSpeed = -100;
} //if speed is less than -100 make
//it -100
rightSpeed = newSpeed * MAXSPEED /
100; //scales the speed to be
//between -MAXSPEED and MAXSPEED
rightServo.write(90 - rightSpeed);
//sends the new value to the servo
}
/*
* sets the speed of the robots
leftServo between -100-(reversed) and 100-(forward)
* NOTE: calls to this routine will
take effect immediatly
*/
void setSpeedLeft(int newSpeed){
if(newSpeed >= 100) {newSpeed =
100;} //if speed is greater than 100
//make it 100
if(newSpeed <= -100){newSpeed =
-100;}//if speed is less than -100
//make it -100
leftSpeed = newSpeed * MAXSPEED /
100;//scales the speed to be
//between -MAXSPEED and MAXSPEED
leftServo.write(90 + leftSpeed);
//sends the new value to the servo
}
/*
* turns the robot randomly left or
right for a random time period between
* minTime (milliseconds) and maxTime
(milliseconds)
*/
void turnRandom(int minTime, int
maxTime){
int choice = random(2);
//Random number to decide
//between left (1) and right (0)
int turnTime =
random(minTime,maxTime); //Random number for the pause
//time
if(choice == 1){ goLeft();}
//If random number = 1 then turn
//left
else {goRight();}
//If random number = 0 then turn
//right
delay(turnTime);
//delay for random time
}
/*
* sends the robot forwards
*/
void goForward(){
leftServo.write(90 + speed);
rightServo.write(90 - speed);
}
/*
* sends the robot backwards
*/
void goBackward(){
leftServo.write(90 - speed);
rightServo.write(90 + speed);
}
/*
* sends the robot right
*/
void goRight(){
leftServo.write(90 + speed);
rightServo.write(90 + speed);
}
/*
* sends the robot left
*/
void goLeft(){
leftServo.write(90 - speed);
rightServo.write(90 - speed);
}
/*
* stops the robot
*/
void goStop(){
leftServo.write(90);
rightServo.write(90);
}
//END OF ARDUINO CONTROLLED SERVO ROBOT
(SERB) ROUTINES
//---------------------------------------------------------------------------
