All the lab works are here!
Dependencies: ISR_Mini-explorer mbed
Fork of VirtualForces by
main.cpp@4:8c56c3ba6e54, 2017-03-24 (annotated)
- Committer:
- AurelienBernier
- Date:
- Fri Mar 24 16:30:30 2017 +0000
- Revision:
- 4:8c56c3ba6e54
- Parent:
- 3:1e0f4cb93eda
- Child:
- 5:dea05b8f30d0
GoToPoint Nearly Working
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
geotsam | 0:8bffb51cc345 | 1 | #include "mbed.h" |
geotsam | 0:8bffb51cc345 | 2 | #include "robot.h" // Initializes the robot. This include should be used in all main.cpp! |
geotsam | 0:8bffb51cc345 | 3 | #include "math.h" |
geotsam | 0:8bffb51cc345 | 4 | |
AurelienBernier | 4:8c56c3ba6e54 | 5 | |
geotsam | 0:8bffb51cc345 | 6 | float dist(float robot_x, float robot_y, float target_x, float target_y); |
geotsam | 0:8bffb51cc345 | 7 | |
AurelienBernier | 4:8c56c3ba6e54 | 8 | //Timeout time; |
geotsam | 0:8bffb51cc345 | 9 | int main(){ |
AurelienBernier | 2:ea61e801e81f | 10 | initRobot(); //Initializing the robot |
geotsam | 0:8bffb51cc345 | 11 | pc.baud(9600); // baud for the pc communication |
geotsam | 0:8bffb51cc345 | 12 | |
AurelienBernier | 2:ea61e801e81f | 13 | //Target example x,y values |
geotsam | 3:1e0f4cb93eda | 14 | float target_x=46.8, target_y=78.6, target_angle=0; |
geotsam | 0:8bffb51cc345 | 15 | |
AurelienBernier | 4:8c56c3ba6e54 | 16 | float alpha; //angle error |
AurelienBernier | 4:8c56c3ba6e54 | 17 | float rho; //distance from target |
geotsam | 3:1e0f4cb93eda | 18 | float beta; |
geotsam | 3:1e0f4cb93eda | 19 | //float k_linear=10, k_angular=200; |
AurelienBernier | 4:8c56c3ba6e54 | 20 | float kRho=3, ka=8, kb=-2; |
geotsam | 0:8bffb51cc345 | 21 | float linear, angular, angular_left, angular_right; |
geotsam | 3:1e0f4cb93eda | 22 | float dt=0.5; |
geotsam | 3:1e0f4cb93eda | 23 | float temp; |
geotsam | 0:8bffb51cc345 | 24 | |
AurelienBernier | 2:ea61e801e81f | 25 | //Diameter of a wheel and distance between the 2 |
geotsam | 0:8bffb51cc345 | 26 | float r=3.25, b=7.2; |
geotsam | 0:8bffb51cc345 | 27 | |
AurelienBernier | 2:ea61e801e81f | 28 | int speed=999; // Max speed at beggining of movement |
geotsam | 0:8bffb51cc345 | 29 | |
AurelienBernier | 2:ea61e801e81f | 30 | //Resetting coordinates before moving |
AurelienBernier | 2:ea61e801e81f | 31 | theta=0; |
geotsam | 0:8bffb51cc345 | 32 | X=0; |
geotsam | 0:8bffb51cc345 | 33 | Y=0; |
geotsam | 0:8bffb51cc345 | 34 | |
AurelienBernier | 4:8c56c3ba6e54 | 35 | alpha = atan2((target_y-Y),(target_x-X))-theta; |
AurelienBernier | 4:8c56c3ba6e54 | 36 | alpha = atan(sin(alpha)/cos(alpha)); |
AurelienBernier | 4:8c56c3ba6e54 | 37 | rho = dist(X, Y, target_x, target_y); |
AurelienBernier | 4:8c56c3ba6e54 | 38 | beta = -alpha-theta+target_angle; |
geotsam | 3:1e0f4cb93eda | 39 | |
geotsam | 0:8bffb51cc345 | 40 | do { |
geotsam | 0:8bffb51cc345 | 41 | pc.printf("\n\n\r entered while"); |
AurelienBernier | 2:ea61e801e81f | 42 | |
AurelienBernier | 2:ea61e801e81f | 43 | //Updating X,Y and theta with the odometry values |
geotsam | 0:8bffb51cc345 | 44 | Odometria(); |
geotsam | 3:1e0f4cb93eda | 45 | |
AurelienBernier | 4:8c56c3ba6e54 | 46 | alpha = atan2((target_y-Y),(target_x-X))-theta; |
AurelienBernier | 4:8c56c3ba6e54 | 47 | alpha = atan(sin(alpha)/cos(alpha)); |
AurelienBernier | 4:8c56c3ba6e54 | 48 | rho = dist(X, Y, target_x, target_y); |
AurelienBernier | 4:8c56c3ba6e54 | 49 | beta = -alpha-theta; |
AurelienBernier | 4:8c56c3ba6e54 | 50 | //beta = -alpha-theta+target_angle; |
geotsam | 0:8bffb51cc345 | 51 | |
AurelienBernier | 2:ea61e801e81f | 52 | //Computing angle error and distance towards the target value |
AurelienBernier | 4:8c56c3ba6e54 | 53 | rho += dt*(-kRho*cos(alpha)*rho); |
AurelienBernier | 4:8c56c3ba6e54 | 54 | temp = alpha; |
AurelienBernier | 4:8c56c3ba6e54 | 55 | alpha += dt*(kRho*sin(alpha)-ka*alpha-kb*b); |
AurelienBernier | 4:8c56c3ba6e54 | 56 | b += dt*(-kRho*sin(temp)); |
AurelienBernier | 4:8c56c3ba6e54 | 57 | pc.printf("\n\r rho=%f", rho); |
geotsam | 0:8bffb51cc345 | 58 | |
AurelienBernier | 2:ea61e801e81f | 59 | //Computing linear and angular velocities |
AurelienBernier | 4:8c56c3ba6e54 | 60 | if(alpha>=-1.5708 && alpha<=1.5708){ |
AurelienBernier | 4:8c56c3ba6e54 | 61 | linear=kRho*rho; |
AurelienBernier | 4:8c56c3ba6e54 | 62 | angular=ka*alpha+kb*beta; |
geotsam | 3:1e0f4cb93eda | 63 | } |
geotsam | 3:1e0f4cb93eda | 64 | else{ |
AurelienBernier | 4:8c56c3ba6e54 | 65 | linear=-kRho*rho; |
AurelienBernier | 4:8c56c3ba6e54 | 66 | angular=-ka*alpha-kb*beta; |
geotsam | 3:1e0f4cb93eda | 67 | } |
geotsam | 0:8bffb51cc345 | 68 | angular_left=(linear-0.5*b*angular)/r; |
geotsam | 0:8bffb51cc345 | 69 | angular_right=(linear+0.5*b*angular)/r; |
geotsam | 0:8bffb51cc345 | 70 | |
AurelienBernier | 2:ea61e801e81f | 71 | //Slowing down at the end for more precision |
AurelienBernier | 4:8c56c3ba6e54 | 72 | if (rho<25) { |
AurelienBernier | 4:8c56c3ba6e54 | 73 | speed = rho*30; |
geotsam | 0:8bffb51cc345 | 74 | } |
AurelienBernier | 2:ea61e801e81f | 75 | |
AurelienBernier | 2:ea61e801e81f | 76 | //Normalize speed for motors |
geotsam | 0:8bffb51cc345 | 77 | if(angular_left>angular_right) { |
geotsam | 0:8bffb51cc345 | 78 | angular_right=speed*angular_right/angular_left; |
geotsam | 0:8bffb51cc345 | 79 | angular_left=speed; |
geotsam | 0:8bffb51cc345 | 80 | } else { |
geotsam | 0:8bffb51cc345 | 81 | angular_left=speed*angular_left/angular_right; |
geotsam | 0:8bffb51cc345 | 82 | angular_right=speed; |
geotsam | 0:8bffb51cc345 | 83 | } |
geotsam | 0:8bffb51cc345 | 84 | |
geotsam | 0:8bffb51cc345 | 85 | pc.printf("\n\r X=%f", X); |
geotsam | 0:8bffb51cc345 | 86 | pc.printf("\n\r Y=%f", Y); |
geotsam | 0:8bffb51cc345 | 87 | |
AurelienBernier | 2:ea61e801e81f | 88 | //Updating motor velocities |
AurelienBernier | 1:f0807d5c5a4b | 89 | leftMotor(1,angular_left); |
AurelienBernier | 1:f0807d5c5a4b | 90 | rightMotor(1,angular_right); |
geotsam | 0:8bffb51cc345 | 91 | |
geotsam | 3:1e0f4cb93eda | 92 | wait(dt); |
AurelienBernier | 4:8c56c3ba6e54 | 93 | } while(rho>1); |
geotsam | 0:8bffb51cc345 | 94 | |
AurelienBernier | 2:ea61e801e81f | 95 | //Stop at the end |
geotsam | 0:8bffb51cc345 | 96 | leftMotor(1,0); |
geotsam | 0:8bffb51cc345 | 97 | rightMotor(1,0); |
geotsam | 0:8bffb51cc345 | 98 | |
AurelienBernier | 4:8c56c3ba6e54 | 99 | pc.printf("\n\r %f -- arrived!", rho); |
geotsam | 0:8bffb51cc345 | 100 | } |
geotsam | 0:8bffb51cc345 | 101 | |
AurelienBernier | 2:ea61e801e81f | 102 | //Distance computation function |
geotsam | 0:8bffb51cc345 | 103 | float dist(float robot_x, float robot_y, float target_x, float target_y){ |
geotsam | 0:8bffb51cc345 | 104 | return sqrt(pow(target_y-robot_y,2) + pow(target_x-robot_x,2)); |
AurelienBernier | 4:8c56c3ba6e54 | 105 | } |
AurelienBernier | 4:8c56c3ba6e54 | 106 | |
AurelienBernier | 4:8c56c3ba6e54 | 107 | /*static double diffclock(clock_t clock1,clock_t clock2) |
AurelienBernier | 4:8c56c3ba6e54 | 108 | { |
AurelienBernier | 4:8c56c3ba6e54 | 109 | double diffticks=clock1-clock2; |
AurelienBernier | 4:8c56c3ba6e54 | 110 | double diffms=(diffticks)/(CLOCKS_PER_SEC/1000); |
AurelienBernier | 4:8c56c3ba6e54 | 111 | return diffms; |
AurelienBernier | 4:8c56c3ba6e54 | 112 | }*/ |