scoutos / scout / libscout / src / behaviors / Odometry.cpp @ 3db79f25
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1 | f79fbce2 | Priya | |
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2 | #include "Odometry.h" |
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3 | |||
4 | using namespace std; |
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5 | |||
6 | /** Set up the odometry node and prepare communcations over ROS */
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7 | 31be19a6 | Priya | Odometry::Odometry(string scoutname):Behavior(scoutname, "odometry") |
8 | f79fbce2 | Priya | { |
9 | scout_pos = new pos;
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10 | 3db79f25 | Priya | motor_fl_ticks = motor_fr_ticks = motor_bl_ticks = motor_br_ticks = 0;
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11 | f79fbce2 | Priya | } |
12 | |||
13 | /** Query encoders and estimate position based on encoder reading */
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14 | void Odometry::get_position()
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15 | { |
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16 | float left_dist, right_dist, total_dist, theta;
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17 | |||
18 | encoder_readings scout_enc = encoders->query(); |
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19 | 31be19a6 | Priya | motor_fl_dist = scout_enc.fl_ticks - motor_fl_ticks; |
20 | motor_fr_dist = scout_enc.fr_ticks - motor_fr_ticks; |
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21 | motor_bl_dist = scout_enc.bl_ticks - motor_bl_ticks; |
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22 | motor_br_dist = scout_enc.br_ticks - motor_br_ticks; |
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23 | f79fbce2 | Priya | |
24 | 3db79f25 | Priya | ROS_INFO("fl %d fr %d bl %d br %d", scout_enc.fl_ticks, scout_enc.fr_ticks, scout_enc.bl_ticks, scout_enc.br_ticks);
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25 | ROS_INFO("fl %d fr %d bl %d br %d", motor_fl_ticks, motor_fr_ticks, motor_bl_ticks, motor_br_ticks);
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26 | ROS_INFO("fl %d fr %d bl %d br %d", motor_fl_dist, motor_fr_dist, motor_bl_dist, motor_br_dist);
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27 | f79fbce2 | Priya | |
28 | 3db79f25 | Priya | // Get Left and Right distance
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29 | left_dist = DIST_PER_TICK*(((float)(motor_fl_dist))/2.0 + |
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30 | ((float)(motor_bl_dist))/2.0); |
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31 | right_dist = DIST_PER_TICK*(((float)(motor_fr_dist))/2.0 + |
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32 | ((float)(motor_br_dist))/2.0); |
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33 | f79fbce2 | Priya | |
34 | 3db79f25 | Priya | total_dist = (left_dist)/2.0 + (right_dist)/2.0; |
35 | theta = scout_pos->theta + atan2(left_dist - right_dist, WHEEL_BASE); |
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36 | |||
37 | ROS_INFO("l: %f r: %f theta: %f", left_dist, right_dist, theta);
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38 | |||
39 | scout_pos->x += total_dist*sin(theta); |
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40 | scout_pos->y += total_dist*cos(theta); |
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41 | scout_pos->theta = fmod(theta, 2*M_PI);
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42 | 31be19a6 | Priya | |
43 | //Save state for next time in.
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44 | motor_fl_ticks = scout_enc.fl_ticks; |
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45 | motor_fr_ticks = scout_enc.fr_ticks; |
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46 | motor_bl_ticks = scout_enc.bl_ticks; |
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47 | motor_br_ticks = scout_enc.br_ticks; |
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48 | 3db79f25 | Priya | |
49 | |||
50 | f79fbce2 | Priya | return;
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51 | } |
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52 | |||
53 | void Odometry::run()
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54 | { |
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55 | while(ok())
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56 | { |
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57 | get_position(); |
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58 | 31be19a6 | Priya | //TODO publish position
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59 | ROS_INFO("Scout is at x: %f y: %f theta: %f\n", scout_pos->x, scout_pos->y, scout_pos->theta);
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60 | f79fbce2 | Priya | } |
61 | } |