Bidirectional Speed Calculator using Infrared (IR) Sensors

This project demonstrates how to calculate the speed of a moving object using Arduino and two IR Sensors irrespective of the direction.

Feb 15, 2021

•

6900 views

•

2 respects

speed calculator

ir sensor projects

speed sensor

Components and supplies

IR Sensor

Breadboard (generic)

128x64 OLED I2C Display

Arduino Nano R3

LED (generic)

Jumper wires (generic)

Apps and platforms

Arduino IDE

Project description

Code

arduino

1/*  Speed Sensor
2
3  This sketch is used to detect the speed of a  moving object between two IR
4  Sensors connected to the Arduino. The IR Sensors  are placed at a set distance.
5
6  The program calculates the speed using the  formula Speed = Distance/Time.
7  The program then prints the speed of the object  on the OLED Display.
8  In addition, start time, end time and the speed are displayed  on the
9  Serial Monitor. The unit used here is metre per second (m/s).
10
11  This program is made by Shreyas for Electronics Champ YouTube Channel.
12  Please  subscribe to this channel. Thank You.
13
14*/
15
16#include <Wire.h>
17#include  <Adafruit_GFX.h>
18#include <Adafruit_SSD1306.h> //Including the libraries
19
20double  startTime = 0; //Initialize the start time
21double endTime = 0;  //Initialize  the end time
22double timeTakenInSeconds = 0; //Difference between start and end  time
23double speedOfObject = 0;  //Holds the value distance divided by time taken
24const  double distance = 1;  // Distance between the two sensors is set to 1 metre
25int  executed = 0;   //Flag to run the code in the loop only once. When set to 1, code  in the loop is not executed.
26int sensor1 = 9;    //First sensor is connected  to pin 9
27int sensor2 = 11;   //Second sensor is connected to pin 11
28int led1  = 10;   //An LED to indicate that the first sensor has sensed an object
29int led2  = 12;   //An LED to indicate that the second sensor has sensed an object
30
31#define  SCREEN_WIDTH 128 // OLED display width, in pixels
32#define SCREEN_HEIGHT 64 //  OLED display height, in pixels
33
34Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT);
35
36//Prints  the logo on OLED Display
37static const uint8_t PROGMEM logo[] = {
38
39  0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00,
40  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
41  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
42  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
43  0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00,
45  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46  0x00, 0x00, 0x07, 0xe8, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47  0x00, 0x00, 0xff, 0xff,  0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48  0x00,  0x01, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00,
49  0x00, 0x07, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
50  0x00, 0x1f, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51  0x00, 0x7f, 0xff, 0xff, 0xff, 0xc0,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
52  0x00, 0xff, 0xff,  0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
53  0x01, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00,
54  0x03, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
55  0x07, 0xfc, 0x11, 0xf1, 0x0f, 0xfc, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00,
56  0x0f, 0xfc, 0xf1, 0xf1,  0xe7, 0xfe, 0x00, 0x7e, 0x60, 0x00, 0x30, 0x00, 0x00, 0x30, 0x00, 0x00,
57  0x1f,  0xfd, 0xfb, 0xf3, 0xe7, 0xff, 0x00, 0x60, 0x60, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00,  0x00,
58  0x1f, 0xfd, 0xff, 0xff, 0xe7, 0xff, 0x00, 0x60, 0x63, 0x87, 0xbb, 0xc7,  0x1f, 0x33, 0xcf, 0x00,
59  0x3f, 0xfd, 0xff, 0xff, 0xe7, 0xff, 0x80, 0x60, 0x66,  0xcd, 0xb3, 0x4d, 0x9b, 0x36, 0xdb, 0x00,
60  0x3f, 0xfd, 0xf9, 0xf3, 0xe7, 0xff,  0x80, 0x7e, 0x64, 0x48, 0x33, 0x08, 0x99, 0x34, 0x18, 0x00,
61  0x7e, 0x40, 0x11,  0xf1, 0x20, 0x1f, 0xc0, 0x60, 0x67, 0xc8, 0x33, 0x08, 0x99, 0x34, 0x1f, 0x00,
62  0x7e, 0x7d, 0xf9, 0xf3, 0xe7, 0xdf, 0xc0, 0x60, 0x64, 0x08, 0x33, 0x08, 0x99,  0x34, 0x01, 0x00,
63  0x7e, 0x7d, 0xfb, 0xff, 0xe7, 0xdf, 0xc0, 0x60, 0x66, 0xcd,  0xb3, 0x0d, 0x99, 0x36, 0xdb, 0x00,
64  0x7e, 0x7d, 0xff, 0xff, 0xe7, 0xdf, 0xc0,  0x7e, 0x63, 0xc7, 0xbb, 0x07, 0x19, 0x33, 0xde, 0x00,
65  0x7e, 0x7d, 0xf9, 0xf3,  0xe7, 0xdf, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
66  0xfe,  0x7c, 0xf1, 0xf1, 0x67, 0xdf, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00,
67  0xfe, 0x7e, 0x11, 0xf1, 0x0f, 0xdf, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
68  0xfe, 0x7f, 0xfb, 0xf3, 0xff, 0xdf, 0xe0, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
69  0xfe, 0x7f, 0xff, 0xff, 0xff, 0xdf,  0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
70  0xfe, 0x7f, 0xff,  0xff, 0xff, 0xdf, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
71  0xfe, 0x7f, 0xff, 0xff, 0xff, 0xdf, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00,
72  0xfe, 0x7f, 0xff, 0xff, 0xff, 0xdf, 0xe0, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
73  0xfe, 0x7f, 0xff, 0xff, 0xff, 0xdf, 0xe0,  0x3c, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
74  0x7e, 0x7f, 0xff, 0xff,  0x7f, 0xdf, 0xe0, 0x7e, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
75  0x7e,  0x7f, 0x27, 0xf8, 0x9f, 0xdf, 0xc0, 0x62, 0x7c, 0x71, 0xf7, 0x3e, 0x00, 0x00, 0x00,  0x00,
76  0x7e, 0x7e, 0xf1, 0xe1, 0xcf, 0xdf, 0xc0, 0x60, 0x6c, 0x59, 0xbb, 0x36,  0x00, 0x00, 0x00, 0x00,
77  0x7e, 0x7e, 0xf8, 0xe3, 0xef, 0xdf, 0xc0, 0x60, 0x64,  0x09, 0x91, 0x32, 0x00, 0x00, 0x00, 0x00,
78  0x3e, 0x7c, 0xf9, 0xf3, 0xef, 0xdf,  0x80, 0x60, 0x64, 0xf9, 0x91, 0x32, 0x00, 0x00, 0x00, 0x00,
79  0x3f, 0x01, 0xff,  0xff, 0xe0, 0x1f, 0x80, 0x62, 0x64, 0x89, 0x91, 0x32, 0x00, 0x00, 0x00, 0x00,
80  0x1f, 0xfc, 0xf9, 0xf3, 0xef, 0xff, 0x80, 0x7e, 0x64, 0x99, 0x91, 0x36, 0x00,  0x00, 0x00, 0x00,
81  0x1f, 0xfe, 0xf8, 0xe3, 0xef, 0xff, 0x00, 0x3c, 0x64, 0xf9,  0x91, 0x3e, 0x00, 0x00, 0x00, 0x00,
82  0x0f, 0xfe, 0x71, 0xf1, 0xdf, 0xff, 0x00,  0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00,
83  0x0f, 0xff, 0x01, 0xfc,  0x3f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00,
84  0x07,  0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00,  0x00,
85  0x03, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
86  0x01, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
87  0x00, 0xff, 0xff, 0xff, 0xff, 0xe0,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
88  0x00, 0x7f, 0xff,  0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
89  0x00, 0x1f, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00,
90  0x00, 0x07, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
91  0x00, 0x00, 0xff, 0xff, 0xe0, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
92  0x00, 0x00, 0x7f, 0xff,  0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
93  0x00,  0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00,
94  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
95  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
96  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
97  0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
98  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00,
99  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
100  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
101  0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
102  0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00 
103
104};
105
106void setup() {
107
108  Serial.begin(9600);
109  //Sets the  pin modes of sensors and LEDs
110  pinMode(sensor1, INPUT);
111  pinMode(sensor2,  INPUT);
112  pinMode(led1, OUTPUT);
113  pinMode(led2, OUTPUT);
114  
115  //LEDs  are turned off
116  digitalWrite(led1, LOW);
117  digitalWrite(led2, LOW);
118
119  //OLED setup (Change the address (0x3C) according to the display)
120  oled.begin(SSD1306_SWITCHCAPVCC,  0x3C);
121  oled.clearDisplay();
122  oled.drawBitmap(0, 0, logo, 128, 64, 1);
123  oled.display();
124  delay(1000);
125  oled.clearDisplay();
126
127}
128
129void  loop() {
130
131  if (executed == 0) { //Flag is initialized to 0 to ensure that  the loop runs only once
132
133    if (digitalRead(sensor1) == 1) { //If movement  is detected by the first sensor
134
135      digitalWrite(led1, HIGH); //Turn on  the LED 
136
137      if (startTime == 0) { //If startTime is 0 and no time has  been logged yet
138
139        startTime = millis(); //Assign Arduino time to startTime
140
141      }
142
143    }
144
145    if (digitalRead(sensor2) == 1) { //If movement is  detected by the second sensor
146
147      digitalWrite(led2, HIGH); //Turn on the  LED
148
149      if (endTime == 0) {  //If endTime is 0 and no time has been logged  yet
150
151        endTime = millis();   //Assign Arduino time to endTime
152
153      }
154
155    }
156
157    if ((startTime != 0) && (endTime != 0)) { //Now  calculate the speed of the object if both times have been registered
158
159      if  (startTime < endTime) { //If the object moves from sensor on pin 9 to sensor on  pin 11
160
161        timeTakenInSeconds = (endTime - startTime) / 1000.0; //Convert  miliseconds to seconds
162        speedOfObject = distance / timeTakenInSeconds;  //Calculate speed in metres per second
163
164        /* Print the values to the  serial monitor */
165        Serial.print("Start Time: "); //Print to the serial  monitor
166        Serial.print(startTime);  //Print value
167        Serial.println("  milliseconds");
168        Serial.print("End Time: "); //Print value
169        Serial.print(endTime);    //Print value
170        Serial.println(" milliseconds");
171        Serial.print("Speed  of Object = ");
172        Serial.print(speedOfObject);
173        Serial.println("  m/s");
174        Serial.println(" ");
175        oled.clearDisplay();
176        oled.setTextSize(2);
177        oled.setCursor(0, 0);
178        oled.setTextColor(WHITE);
179        oled.print("Speed  of");
180        oled.setCursor(0, 19);
181        oled.print("Object is");
182        oled.setCursor(0, 37);
183        oled.print(speedOfObject);
184        oled.println("  m/s");
185        oled.display();
186        executed = 1; //Set the value to 1  to stop the loop from running again
187        reset();
188
189      }
190
191      else  {     //If the object moves from sensor on pin 11 to sensor on pin 9
192
193        timeTakenInSeconds  = (startTime - endTime) / 1000.0; //The value of startTime is greater than endTime
194        speedOfObject = distance / timeTakenInSeconds;  //Calculate speed in metres  per second
195
196        /* Print the values to the serial monitor */
197        Serial.print("Start  Time: ");
198        Serial.print(endTime);
199        Serial.println(" milliseconds");
200        Serial.print("End Time: ");
201        Serial.print(startTime);
202        Serial.println("  milliseconds");
203        Serial.print("Speed of Object = ");
204        Serial.print(speedOfObject);
205        Serial.println(" m/s");
206        Serial.println(" ");
207
208        /*  Print the values on the OLED Display */
209        oled.clearDisplay();
210        oled.setTextSize(2);
211        oled.setCursor(0, 0);
212        oled.setTextColor(WHITE);
213        oled.print("Speed  of");
214        oled.setCursor(0, 19);
215        oled.print("Object is");
216        oled.setCursor(0, 37);
217        oled.print(speedOfObject);
218        oled.println("  m/s");
219        oled.display();
220        executed = 1;   //Set the value to  1 to stop the loop from running again
221        reset();  //A function to start  the loop from running again
222
223      }
224    }
225  }
226}
227
228void reset()  {
229
230  delay(5000);
231  executed = 0;
232  startTime = 0;
233  endTime = 0;    //Set the value to 0 to start the loop from running again
234  digitalWrite(led1,  LOW);
235  digitalWrite(led2, LOW);  //Turns off both the LEDs
236  speedOfObject  = 0;    //sets the speed to 0
237
238  //Resets the OLED Display
239  oled.clearDisplay();
240  oled.setTextSize(2);
241  oled.setCursor(0, 0);
242  oled.setTextColor(WHITE);
243  oled.print("Speed of");
244  oled.setCursor(0, 19);
245  oled.print("Object  is");
246  oled.setCursor(0, 37);
247  oled.print(speedOfObject);
248  oled.println("  m/s");
249  oled.display();
250
251}

/*  Speed Sensor

  This sketch is used to detect the speed of a  moving object between two IR
  Sensors connected to the Arduino. The IR Sensors  are placed at a set distance.

  The program calculates the speed using the  formula Speed = Distance/Time.
  The program then prints the speed of the object  on the OLED Display.
  In addition, start time, end time and the speed are displayed  on the
  Serial Monitor. The unit used here is metre per second (m/s).

  This program is made by Shreyas for Electronics Champ YouTube Channel.
  Please  subscribe to this channel. Thank You.

*/

#include <Wire.h>
#include  <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h> //Including the libraries

double  startTime = 0; //Initialize the start time
double endTime = 0;  //Initialize  the end time
double timeTakenInSeconds = 0; //Difference between start and end  time
double speedOfObject = 0;  //Holds the value distance divided by time taken
const  double distance = 1;  // Distance between the two sensors is set to 1 metre
int  executed = 0;   //Flag to run the code in the loop only once. When set to 1, code  in the loop is not executed.
int sensor1 = 9;    //First sensor is connected  to pin 9
int sensor2 = 11;   //Second sensor is connected to pin 11
int led1  = 10;   //An LED to indicate that the first sensor has sensed an object
int led2  = 12;   //An LED to indicate that the second sensor has sensed an object

#define  SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 //  OLED display height, in pixels

Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT);

//Prints  the logo on OLED Display
static const uint8_t PROGMEM logo[] = {

  0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x07, 0xe8, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xff, 0xff,  0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00,  0x01, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00,
  0x00, 0x07, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
  0x00, 0x1f, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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};

void setup() {

  Serial.begin(9600);
  //Sets the  pin modes of sensors and LEDs
  pinMode(sensor1, INPUT);
  pinMode(sensor2,  INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  
  //LEDs  are turned off
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);

  //OLED setup (Change the address (0x3C) according to the display)
  oled.begin(SSD1306_SWITCHCAPVCC,  0x3C);
  oled.clearDisplay();
  oled.drawBitmap(0, 0, logo, 128, 64, 1);
  oled.display();
  delay(1000);
  oled.clearDisplay();

}

void  loop() {

  if (executed == 0) { //Flag is initialized to 0 to ensure that  the loop runs only once

    if (digitalRead(sensor1) == 1) { //If movement  is detected by the first sensor

      digitalWrite(led1, HIGH); //Turn on  the LED 

      if (startTime == 0) { //If startTime is 0 and no time has  been logged yet

        startTime = millis(); //Assign Arduino time to startTime

      }

    }

    if (digitalRead(sensor2) == 1) { //If movement is  detected by the second sensor

      digitalWrite(led2, HIGH); //Turn on the  LED

      if (endTime == 0) {  //If endTime is 0 and no time has been logged  yet

        endTime = millis();   //Assign Arduino time to endTime

      }

    }

    if ((startTime != 0) && (endTime != 0)) { //Now  calculate the speed of the object if both times have been registered

      if  (startTime < endTime) { //If the object moves from sensor on pin 9 to sensor on  pin 11

        timeTakenInSeconds = (endTime - startTime) / 1000.0; //Convert  miliseconds to seconds
        speedOfObject = distance / timeTakenInSeconds;  //Calculate speed in metres per second

        /* Print the values to the  serial monitor */
        Serial.print("Start Time: "); //Print to the serial  monitor
        Serial.print(startTime);  //Print value
        Serial.println("  milliseconds");
        Serial.print("End Time: "); //Print value
        Serial.print(endTime);    //Print value
        Serial.println(" milliseconds");
        Serial.print("Speed  of Object = ");
        Serial.print(speedOfObject);
        Serial.println("  m/s");
        Serial.println(" ");
        oled.clearDisplay();
        oled.setTextSize(2);
        oled.setCursor(0, 0);
        oled.setTextColor(WHITE);
        oled.print("Speed  of");
        oled.setCursor(0, 19);
        oled.print("Object is");
        oled.setCursor(0, 37);
        oled.print(speedOfObject);
        oled.println("  m/s");
        oled.display();
        executed = 1; //Set the value to 1  to stop the loop from running again
        reset();

      }

      else  {     //If the object moves from sensor on pin 11 to sensor on pin 9

        timeTakenInSeconds  = (startTime - endTime) / 1000.0; //The value of startTime is greater than endTime
        speedOfObject = distance / timeTakenInSeconds;  //Calculate speed in metres  per second

        /* Print the values to the serial monitor */
        Serial.print("Start  Time: ");
        Serial.print(endTime);
        Serial.println(" milliseconds");
        Serial.print("End Time: ");
        Serial.print(startTime);
        Serial.println("  milliseconds");
        Serial.print("Speed of Object = ");
        Serial.print(speedOfObject);
        Serial.println(" m/s");
        Serial.println(" ");

        /*  Print the values on the OLED Display */
        oled.clearDisplay();
        oled.setTextSize(2);
        oled.setCursor(0, 0);
        oled.setTextColor(WHITE);
        oled.print("Speed  of");
        oled.setCursor(0, 19);
        oled.print("Object is");
        oled.setCursor(0, 37);
        oled.print(speedOfObject);
        oled.println("  m/s");
        oled.display();
        executed = 1;   //Set the value to  1 to stop the loop from running again
        reset();  //A function to start  the loop from running again

      }
    }
  }
}

void reset()  {

  delay(5000);
  executed = 0;
  startTime = 0;
  endTime = 0;    //Set the value to 0 to start the loop from running again
  digitalWrite(led1,  LOW);
  digitalWrite(led2, LOW);  //Turns off both the LEDs
  speedOfObject  = 0;    //sets the speed to 0

  //Resets the OLED Display
  oled.clearDisplay();
  oled.setTextSize(2);
  oled.setCursor(0, 0);
  oled.setTextColor(WHITE);
  oled.print("Speed of");
  oled.setCursor(0, 19);
  oled.print("Object  is");
  oled.setCursor(0, 37);
  oled.print(speedOfObject);
  oled.println("  m/s");
  oled.display();

}

Downloadable files

Schematic

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