Is The Overtaking Car Keeping Enough Side Distance To You?

Simple and effective method (some police is using too) how to measure the side distance to an overtaking car.

Jun 30, 2020

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3 respects

traffic

driving

bicylce

Devices & Components

Arduino Uno Rev3

Ultrasonic Sensor - HC-SR04 (Generic)

Rocker Switch, SPST

9V battery (generic)

5 mm LED: Green

Resistor 100 ohm

5 mm LED: Yellow

Through Hole Resistor, 150 ohm

Rotary potentiometer (generic)

Alphanumeric LCD, 16 x 2

Snap-on Connector, For 1 9-V Battery

5 mm LED: Red

5 mm LED: Blue

Standard Terminal Block, Lever-Nuts

Jumper wires (generic)

Breadboard (generic)

Hardware & Tools

Cutter knife (generic)

Crimp Tool (generic)

Side cutter (generic)

Soldering iron (generic)

Tape, Electrical

Software & Tools

Arduino IDE

Project description

Code

Ultrasonic_Seitenabstand.ino

c_cpp

1#include <LiquidCrystal.h>
2int trigger=7;
3int echo=6; 
4int blue=8;
5int   green=9;
6int yellow=10;
7int red=13;
8long distance,duration;
9LiquidCrystal   lcd(12,11,5,4,3,2);
10void setup() {
11  pinMode(trigger,OUTPUT);
12  pinMode(echo,INPUT);
13   lcd.begin(16,2);
14  pinMode(blue,OUTPUT);
15  pinMode(green,OUTPUT);
16  pinMode(yellow,OUTPUT);
17   pinMode(red,OUTPUT);
18}
19
20void loop() {
21  lcd.clear();
22  digitalWrite(trigger,   LOW); 
23  delay(5); 
24  digitalWrite(trigger, HIGH); 
25  delay(10);
26  digitalWrite(trigger,   LOW);
27  duration = pulseIn(echo, HIGH); 
28  distance = ((duration/2) * 0.03432)   - 20; 
29  lcd.print(distance);
30  if(distance>400 || distance<30){ //failure   or not making sense to measure
31    digitalWrite(blue,HIGH);
32    digitalWrite(green,LOW);
33     digitalWrite(yellow,LOW);
34    digitalWrite(red,LOW);
35  }else if(distance<400   && distance>150){ //enough distance
36    digitalWrite(blue,LOW);
37    digitalWrite(green,HIGH);
38     digitalWrite(yellow,LOW);
39    digitalWrite(red,LOW);    
40  }else if(distance<150   && distance>100){ //too little distance
41    digitalWrite(blue,LOW);
42    digitalWrite(green,LOW);
43     digitalWrite(yellow,HIGH);
44    digitalWrite(red,LOW);
45  }else if(distance<100   && distance>30){ //far too little distance
46    digitalWrite(blue,LOW);
47    digitalWrite(green,LOW);
48     digitalWrite(yellow,LOW);
49    digitalWrite(red,HIGH);
50  }
51  delay(100);   //repeating fast enough to have a current value but slow enough having enough time   to read the value
52}
53

#include <LiquidCrystal.h>
int trigger=7;
int echo=6; 
int blue=8;
int   green=9;
int yellow=10;
int red=13;
long distance,duration;
LiquidCrystal   lcd(12,11,5,4,3,2);
void setup() {
  pinMode(trigger,OUTPUT);
  pinMode(echo,INPUT);
   lcd.begin(16,2);
  pinMode(blue,OUTPUT);
  pinMode(green,OUTPUT);
  pinMode(yellow,OUTPUT);
   pinMode(red,OUTPUT);
}

void loop() {
  lcd.clear();
  digitalWrite(trigger,   LOW); 
  delay(5); 
  digitalWrite(trigger, HIGH); 
  delay(10);
  digitalWrite(trigger,   LOW);
  duration = pulseIn(echo, HIGH); 
  distance = ((duration/2) * 0.03432)   - 20; 
  lcd.print(distance);
  if(distance>400 || distance<30){ //failure   or not making sense to measure
    digitalWrite(blue,HIGH);
    digitalWrite(green,LOW);
     digitalWrite(yellow,LOW);
    digitalWrite(red,LOW);
  }else if(distance<400   && distance>150){ //enough distance
    digitalWrite(blue,LOW);
    digitalWrite(green,HIGH);
     digitalWrite(yellow,LOW);
    digitalWrite(red,LOW);    
  }else if(distance<150   && distance>100){ //too little distance
    digitalWrite(blue,LOW);
    digitalWrite(green,LOW);
     digitalWrite(yellow,HIGH);
    digitalWrite(red,LOW);
  }else if(distance<100   && distance>30){ //far too little distance
    digitalWrite(blue,LOW);
    digitalWrite(green,LOW);
     digitalWrite(yellow,LOW);
    digitalWrite(red,HIGH);
  }
  delay(100);   //repeating fast enough to have a current value but slow enough having enough time   to read the value
}

Ultrasonic_Seitenabstand.ino

c_cpp

1#include <LiquidCrystal.h>
2int trigger=7;
3int echo=6; 
4int blue=8;
5int  green=9;
6int yellow=10;
7int red=13;
8long distance,duration;
9LiquidCrystal  lcd(12,11,5,4,3,2);
10void setup() {
11  pinMode(trigger,OUTPUT);
12  pinMode(echo,INPUT);
13  lcd.begin(16,2);
14  pinMode(blue,OUTPUT);
15  pinMode(green,OUTPUT);
16  pinMode(yellow,OUTPUT);
17  pinMode(red,OUTPUT);
18}
19
20void loop() {
21  lcd.clear();
22  digitalWrite(trigger,  LOW); 
23  delay(5); 
24  digitalWrite(trigger, HIGH); 
25  delay(10);
26  digitalWrite(trigger,  LOW);
27  duration = pulseIn(echo, HIGH); 
28  distance = ((duration/2) * 0.03432)  - 20; 
29  lcd.print(distance);
30  if(distance>400 || distance<30){ //failure  or not making sense to measure
31    digitalWrite(blue,HIGH);
32    digitalWrite(green,LOW);
33    digitalWrite(yellow,LOW);
34    digitalWrite(red,LOW);
35  }else if(distance<400  && distance>150){ //enough distance
36    digitalWrite(blue,LOW);
37    digitalWrite(green,HIGH);
38    digitalWrite(yellow,LOW);
39    digitalWrite(red,LOW);    
40  }else if(distance<150  && distance>100){ //too little distance
41    digitalWrite(blue,LOW);
42    digitalWrite(green,LOW);
43    digitalWrite(yellow,HIGH);
44    digitalWrite(red,LOW);
45  }else if(distance<100  && distance>30){ //far too little distance
46    digitalWrite(blue,LOW);
47    digitalWrite(green,LOW);
48    digitalWrite(yellow,LOW);
49    digitalWrite(red,HIGH);
50  }
51  delay(100);  //repeating fast enough to have a current value but slow enough having enough time  to read the value
52}
53

#include <LiquidCrystal.h>
int trigger=7;
int echo=6; 
int blue=8;
int  green=9;
int yellow=10;
int red=13;
long distance,duration;
LiquidCrystal  lcd(12,11,5,4,3,2);
void setup() {
  pinMode(trigger,OUTPUT);
  pinMode(echo,INPUT);
  lcd.begin(16,2);
  pinMode(blue,OUTPUT);
  pinMode(green,OUTPUT);
  pinMode(yellow,OUTPUT);
  pinMode(red,OUTPUT);
}

void loop() {
  lcd.clear();
  digitalWrite(trigger,  LOW); 
  delay(5); 
  digitalWrite(trigger, HIGH); 
  delay(10);
  digitalWrite(trigger,  LOW);
  duration = pulseIn(echo, HIGH); 
  distance = ((duration/2) * 0.03432)  - 20; 
  lcd.print(distance);
  if(distance>400 || distance<30){ //failure  or not making sense to measure
    digitalWrite(blue,HIGH);
    digitalWrite(green,LOW);
    digitalWrite(yellow,LOW);
    digitalWrite(red,LOW);
  }else if(distance<400  && distance>150){ //enough distance
    digitalWrite(blue,LOW);
    digitalWrite(green,HIGH);
    digitalWrite(yellow,LOW);
    digitalWrite(red,LOW);    
  }else if(distance<150  && distance>100){ //too little distance
    digitalWrite(blue,LOW);
    digitalWrite(green,LOW);
    digitalWrite(yellow,HIGH);
    digitalWrite(red,LOW);
  }else if(distance<100  && distance>30){ //far too little distance
    digitalWrite(blue,LOW);
    digitalWrite(green,LOW);
    digitalWrite(yellow,LOW);
    digitalWrite(red,HIGH);
  }
  delay(100);  //repeating fast enough to have a current value but slow enough having enough time  to read the value
}

Downloadable files

Schematic

The most non 5V and non ground cables are colored as in the pictures.

Schematic

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