root / scout / libscout / src / behaviors / line_follow.cpp @ a107608f
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1 | 9143e077 | Lalitha Ganesan | /**
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2 | 58371433 | Priya | * Copyright (c) 2011 Colony Project
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3 | *
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4 | * Permission is hereby granted, free of charge, to any person
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5 | * obtaining a copy of this software and associated documentation
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6 | * files (the "Software"), to deal in the Software without
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7 | * restriction, including without limitation the rights to use,
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8 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | * copies of the Software, and to permit persons to whom the
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10 | * Software is furnished to do so, subject to the following
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11 | * conditions:
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12 | *
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13 | * The above copyright notice and this permission notice shall be
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14 | * included in all copies or substantial portions of the Software.
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15 | *
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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18 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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23 | * OTHER DEALINGS IN THE SOFTWARE.
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24 | 9143e077 | Lalitha Ganesan | */
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25 | |||
26 | 60b98383 | Priya | #include "line_follow.h" |
27 | 9143e077 | Lalitha Ganesan | |
28 | 58371433 | Priya | using namespace std; |
29 | 9143e077 | Lalitha Ganesan | |
30 | 58371433 | Priya | static int motor_l; |
31 | static int motor_r; |
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32 | 9143e077 | Lalitha Ganesan | |
33 | afa9104d | Priya | Duration init_turn_time(0.5); |
34 | |||
35 | 58371433 | Priya | void line_follow::follow_line()
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36 | { |
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37 | afa9104d | Priya | do
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38 | 58371433 | Priya | { |
39 | double line_loc = linesensor->readline();
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40 | 9143e077 | Lalitha Ganesan | |
41 | 58371433 | Priya | motor_l = -MOTOR_BASE + SCALE * line_loc; |
42 | motor_r = -MOTOR_BASE - SCALE * line_loc; |
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43 | 9143e077 | Lalitha Ganesan | |
44 | 58371433 | Priya | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |
45 | } |
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46 | afa9104d | Priya | while(!linesensor->fullline());
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47 | 58371433 | Priya | halt(); |
48 | 1905324e | Priya | ROS_INFO("Intersection reached!");
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49 | 58371433 | Priya | } |
50 | 9143e077 | Lalitha Ganesan | |
51 | afa9104d | Priya | void line_follow::turn_straight()
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52 | { |
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53 | do
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54 | { |
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55 | motor_l = -MOTOR_BASE; |
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56 | motor_r = -MOTOR_BASE; |
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57 | |||
58 | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |
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59 | } |
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60 | while(linesensor->fullline());
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61 | } |
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62 | |||
63 | 58371433 | Priya | void line_follow::turn_left()
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64 | 60b98383 | Priya | { |
65 | 58371433 | Priya | bool first = true; |
66 | afa9104d | Priya | float line_loc;
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67 | 58371433 | Priya | do
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68 | { |
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69 | motor_l = -MOTOR_BASE; |
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70 | motor_r = MOTOR_BASE/8;
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71 | 60b98383 | Priya | |
72 | 58371433 | Priya | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |
73 | 60b98383 | Priya | |
74 | 58371433 | Priya | if(first)
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75 | 9143e077 | Lalitha Ganesan | { |
76 | afa9104d | Priya | init_turn_time.sleep(); |
77 | 58371433 | Priya | first = false;
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78 | 9143e077 | Lalitha Ganesan | } |
79 | afa9104d | Priya | |
80 | line_loc = linesensor->readline(); |
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81 | 60b98383 | Priya | } |
82 | 58c19c15 | Priya | while(!(-1 < line_loc && line_loc < 1)); |
83 | 9143e077 | Lalitha Ganesan | } |
84 | |||
85 | 58371433 | Priya | void line_follow::halt()
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86 | 9143e077 | Lalitha Ganesan | { |
87 | 58371433 | Priya | motors->set_sides(0, 0, MOTOR_ABSOLUTE); |
88 | 9143e077 | Lalitha Ganesan | } |
89 | |||
90 | afa9104d | Priya | void line_follow::spot_turn()
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91 | { |
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92 | bool first = true; |
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93 | float line_loc;
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94 | do
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95 | { |
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96 | motor_l = MOTOR_BASE; |
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97 | motor_r = -MOTOR_BASE; |
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98 | |||
99 | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |
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100 | |||
101 | if(first)
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102 | { |
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103 | while(line_loc < 2 && line_loc > -2) |
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104 | line_loc = linesensor->readline(); |
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105 | |||
106 | first = false;
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107 | } |
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108 | line_loc = linesensor->readline(); |
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109 | } |
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110 | while(!(-1 < line_loc && line_loc < 1)); |
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111 | } |
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112 | |||
113 | 58371433 | Priya | void line_follow::turn_right()
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114 | 9143e077 | Lalitha Ganesan | { |
115 | 58371433 | Priya | bool first = true; |
116 | afa9104d | Priya | float line_loc;
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117 | 58371433 | Priya | do
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118 | { |
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119 | motor_l = MOTOR_BASE/8;
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120 | motor_r = -MOTOR_BASE; |
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121 | 60b98383 | Priya | |
122 | 58371433 | Priya | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |
123 | 60b98383 | Priya | |
124 | 58371433 | Priya | if(first)
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125 | 60b98383 | Priya | { |
126 | afa9104d | Priya | init_turn_time.sleep(); |
127 | 58371433 | Priya | first = false;
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128 | 60b98383 | Priya | } |
129 | afa9104d | Priya | |
130 | line_loc = linesensor->readline(); |
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131 | 60b98383 | Priya | } |
132 | afa9104d | Priya | while(!(-1 < line_loc && line_loc < 1)); |
133 | 9143e077 | Lalitha Ganesan | } |
134 | |||
135 | 1905324e | Priya | void line_follow::u_turn()
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136 | 9143e077 | Lalitha Ganesan | { |
137 | 1905324e | Priya | turn_right(); |
138 | 58371433 | Priya | follow_line(); |
139 | turn_right(); |
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140 | 1905324e | Priya | } |
141 | |||
142 | void line_follow::run()
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143 | { |
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144 | 58371433 | Priya | follow_line(); |
145 | afa9104d | Priya | turn_right(); |
146 | 58371433 | Priya | follow_line(); |
147 | afa9104d | Priya | turn_straight(); |
148 | motors->set_sides(-MOTOR_BASE, -MOTOR_BASE, MOTOR_ABSOLUTE); |
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149 | Duration meow(2);
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150 | meow.sleep(); |
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151 | spot_turn(); |
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152 | 58371433 | Priya | follow_line(); |
153 | 9143e077 | Lalitha Ganesan | } |