Smile and Sad Face Using Arduino and Ultrasonic Sensor

ultrasonic smile using arduino

In this project , as the distance between ultrasonic sensor and object decreases smiley face get obtained , and sad face as distance increases

components needed

breadboard

Arduino

MAX7219

ultrasonic sensor

wires

#include ledControl.h

const int trigPin = 7;

const int echoPin = 8;

long duration;

int distance;

int DIN = 12; int CS = 11; int CLK = 10;

byte smile[8]= {0x3C,0x42,0x95,0xA1,0xA1,0x95,0x42,0x3C};

byte neutral[8]= {0x3C,0x42,0xA5,0x81,0xBD,0x81,0x42,0x3C};

byte sad[8]= {0x3C,0x42,0xA5,0x91,0x91,0xA5,0x42,0x3C};

LedControl lc=LedControl(DIN,CLK,CS,0);

void setup() { pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output

pinMode(echoPin, INPUT); // Sets the echoPin as an Input

Serial.begin(9600); // Starts the serial communication

lc.shutdown(0,false); //The MAX72XX is in power-saving mode on startup

lc.setIntensity(0,15); // Set the brightness to maximum value

lc.clearDisplay(0); // and clear the display

}

void loop() {

digitalWrite(trigPin, LOW);

delayMicroseconds(2); // Sets the trigPin on HIGH state for 10 micro seconds

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW); // Reads the echoPin, returns the sound wave travel time in microseconds duration = pulseIn(echoPin, HIGH); // Calculating the distance distance= duration*0.034/2; // Prints the distance on the Serial Monitor Serial.print("Distance: "); Serial.println(distance);

if(distance<6) { printByte(smile); delay(150);

} else { printByte(sad); delay(150); }

}

void printByte(byte character []) { int i = 0; for(i=0;i<8;i++) { lc.setRow(0,i,character[i]); } }