BACK

Final Project

This is the concept work for my project. The ultrasonic sensor detects the distance between the device and the object. The LCD screen displays that distance.

This is the schematic for the circuit. As previously mentioned, there is a ultrasonic sensor and LCD display, but there is also a potentiometer to adjust the brightness of the LCD display.

This is my circuit. The entire circuit is enclosed in a prototype cardboard box for ease of mobility. The entire circuit is also power by a 9V battery for mobility.

Firmware


                //declaring library

                #include 

                    

                //creating LCD object

                LiquidCrystal lcd(1, 2, 4, 5, 6, 7);

                

                //defining trigPin variable

                const int trigPin = 9;

                //defining echoPin variable

                const int echoPin = 10;

                //defining duration variable for ultrasonic sensor

                long duration;

                // defining distanceCm variable

                int distanceCm;

                

                //setup function

                void setup() {  

                
                    //dimension setup for LCD screen

                    lcd.begin(16,2);

                    //setup for trigPin

                    pinMode(trigPin, OUTPUT);

                    //setup for echoPin

                    pinMode(echoPin, INPUT);

                
                }

                

                //loop function

                void loop() {

                
                    //write LOW to trigPin

                    digitalWrite(trigPin, LOW);

                    //delay

                    delayMicroseconds(2);

                    //write HIGH to trigPin

                    digitalWrite(trigPin, HIGH);

                    //delay

                    delayMicroseconds(10);

                    //write LOW to trigPin

                    digitalWrite(trigPin, LOW);

                    

                    //measurement between trigPin HIGH and echoPin HIGH

                    duration = pulseIn(echoPin, HIGH);

                    //distanceCm calculation

                    distanceCm= duration*0.034/2;

                    

                    //writing to LCD starting point

                    lcd.setCursor(0,0);

                    //writing to LCD

                    lcd.print("Distance: "); 

                    //writing distance to LCD

                    lcd.print(distanceCm); 

                    //writing to LCD

                    lcd.print("  cm ");

                    //delay

                    delay(10);

                
                }

This is the code for my project.

Code inspired from: https://howtomechatronics.com/tutorials/arduino/ultrasonic-sensor-hc-sr04/ & https://howtomechatronics.com/tutorials/arduino/lcd-tutorial/

This is a demo of my project.

Technical Write up

The concept of this project was to build a device for the main use case of determining the exact distance between two objects. To bring this concept to life I used an UNO board, an ultrasonic sensor, a potentiometer, and an LCD display.
Assisted by the firmware transferred onto the UNO board the ultrasonic sensor measures the distance the between itself and an object in its line of sight. The UNO board translates this data onto the LCD display. The brightness of the LCD display is controlled by the potentiometer.
This complete circuit is power by a 9V battery and is stored in a cardboard box for easy mobility.