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1 | /* |
2 | This program is free software: you can redistribute it and/or modify |
3 | it under the terms of the GNU Affero General Public License as |
4 | published by the Free Software Foundation, either version 3 of the |
5 | License, or (at your option) any later version. |
6 | |
7 | This program is distributed in the hope that it will be useful, |
8 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
9 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
10 | GNU Affero General Public License for more details. |
11 | |
12 | You should have received a copy of the GNU Affero General Public License |
13 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
14 | */ |
15 | |
16 | // define which pins are connected to which components |
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17 | int right_motor_forward_pin = 3; |
18 | int right_motor_backward_pin = 4; |
19 | int right_motor_speed_pin = 5; |
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20 | |
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21 | int right_echo_pin = 6; |
22 | int right_trigger_pin = 7; |
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23 | |
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24 | int left_motor_forward_pin = 8; |
25 | int left_motor_backward_pin = 9; |
26 | int left_motor_speed_pin = 10; |
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27 | |
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28 | int left_echo_pin = 11; |
29 | int left_trigger_pin = 12; |
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30 | |
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31 | void on(int pin){ |
32 | digitalWrite(pin, HIGH);} |
33 | |
34 | void off(int pin){ |
35 | digitalWrite(pin, LOW);} |
36 | |
37 | void set_motor(int speed_pin, |
38 | int forward_pin, |
39 | int backward_pin, |
40 | int speed){ |
41 | if(speed > 0){ |
42 | off(backward_pin); |
43 | on(forward_pin);} |
44 | else if(speed < 0){ |
45 | off(forward_pin); |
46 | on(backward_pin); |
47 | speed = -speed;} |
48 | else{ // speed is 0 |
49 | off(forward_pin); |
50 | off(backward_pin);} |
51 | // since speed has been set positive, no need to check if speed < -255. |
52 | if(speed > 255){ |
53 | speed = 255;} |
54 | analogWrite(speed_pin, speed);} |
55 | |
56 | void go(int left_motor_speed, int right_motor_speed){ |
57 | set_motor(left_motor_speed_pin, |
58 | left_motor_forward_pin, |
59 | left_motor_backward_pin, |
60 | left_motor_speed); |
61 | set_motor(right_motor_speed_pin, |
62 | right_motor_forward_pin, |
63 | right_motor_backward_pin, |
64 | right_motor_speed);} |
65 | |
66 | int ping(int trigger, int echo){ |
67 | int ping_time = 0; |
68 | // turn off trigger |
69 | off(trigger); |
70 | delayMicroseconds(2); |
71 | // turn on the trigger and leave it on long enough for the |
72 | // sonar sensor to notice |
73 | on(trigger); |
74 | delayMicroseconds(10); |
75 | off(trigger); |
76 | ping_time = pulseIn(echo, HIGH); |
77 | if(ping_time <= 0){ |
78 | ping_time = 3000;} |
79 | // sonar needs some time to recover before pinging again, |
80 | // so make sure it gets enough sleep right here. 50 milliseconds |
81 | delay(50); |
82 | return ping_time;} |
83 | |
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84 | void setup(){ |
85 | Serial.begin(9600); |
86 | |
87 | pinMode(right_motor_speed_pin, OUTPUT); |
88 | pinMode(right_motor_forward_pin, OUTPUT); |
89 | pinMode(right_motor_backward_pin, OUTPUT); |
90 | |
91 | pinMode(right_echo_pin, INPUT); |
92 | pinMode(right_trigger_pin, OUTPUT); |
93 | |
94 | pinMode(left_motor_speed_pin, OUTPUT); |
95 | pinMode(left_motor_forward_pin, OUTPUT); |
96 | pinMode(left_motor_backward_pin, OUTPUT); |
97 | |
98 | pinMode(left_echo_pin, INPUT); |
99 | pinMode(left_trigger_pin, OUTPUT); |
100 | |
101 | off(left_motor_speed_pin); |
102 | off(left_motor_forward_pin); |
103 | off(left_motor_backward_pin); |
104 | off(left_trigger_pin); |
105 | |
106 | off(right_motor_speed_pin); |
107 | off(right_motor_forward_pin); |
108 | off(right_motor_backward_pin); |
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109 | off(right_trigger_pin); } |
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110 | |
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111 | void loop() { |
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112 | int left_speed; |
113 | int right_speed; |
114 | |
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115 | // you'll need to adjust these based on your sonar sensor's behavior |
116 | int desired_right_ping_time = 800; |
117 | int desired_left_ping_time = 800; |
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118 | |
119 | unsigned int actual_left_ping_time = ping(left_trigger_pin, left_echo_pin); |
120 | unsigned int actual_right_ping_time = ping(right_trigger_pin, right_echo_pin); |
121 | |
122 | left_speed = actual_left_ping_time - desired_left_ping_time; |
123 | right_speed = actual_right_ping_time - desired_right_ping_time; |
124 | |
125 | Serial.print("left: ping = "); |
126 | Serial.print(actual_left_ping_time); |
127 | Serial.print(" speed = "); |
128 | Serial.print(left_speed); |
129 | Serial.print(" right: ping = "); |
130 | Serial.print(actual_right_ping_time); |
131 | Serial.print(" speed = "); |
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132 | Serial.print(right_speed); |
133 | Serial.println(); |
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134 | |
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135 | go(left_speed, right_speed); } |