Hi guys,
This is my first tutorial, I’ve just started a few months ago learning electronics (previously I’ve just knew how to program in C and Python). When I finished this project (took me about 5 hours or something) I’ve decided to share to help anyone that is starting in electronics.
What’s this project about?
Basically we have an Ultrasonic sensor that measures the distance and the LED’s bar graph will light up according to our distance from the sensor and as we get closer the buzzer beeps in a different way. This circuit can work as a parking sensor! It’s easy and cheap.
Parts Required
- Arduino UNO – read Best Arduino Starter Kits
- 1x 74HC595 8 Bit Shift Register
- 1x Breadboard
- 8x LEDs (for example: 3x red, 3x yellow, 2x green)
- 9x 220 Ohm Resistors
- 1x Buzzer
- 1x Ultrasonic Sensor (for exemple: HC-SR04)
- Jumper Wires
Schematics
Upload the Code below
/*
*
* Ultrasonic Sensor with LED's bar graph and buzzer
*/
int tonePin = 4; //Tone - Red Jumper
int trigPin = 9; //Trig - violet Jumper
int echoPin = 10; //Echo - yellow Jumper
int clockPin = 11; //IC Pin 11 - white Jumper
int latchPin = 12; //IC Pin 12 - Blue Jumper
int dataPin = 13; //IC Pin 14 - Green Jumper
byte possible_patterns[9] = {
B00000000,
B00000001,
B00000011,
B00000111,
B00001111,
B00011111,
B00111111,
B01111111,
B11111111,
};
int proximity=0;
int duration;
int distance;
void setup() {
//Serial Port
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(clockPin, OUTPUT);
pinMode(latchPin, OUTPUT);
pinMode(dataPin, OUTPUT);
pinMode(tonePin, OUTPUT);
}
void loop() {
digitalWrite(latchPin, LOW);
digitalWrite(trigPin, HIGH);
delayMicroseconds(1000);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
/*if (distance >= 45 || distance <= 0){
Serial.println("Out of range");
}
else {
Serial.print(distance);
Serial.println(" cm");
}*/
proximity=map(distance, 0, 45, 8, 0);
//Serial.println(proximity);
if (proximity <= 0){
proximity=0;
}
else if (proximity >= 3 && proximity <= 4){
tone(tonePin, 200000, 200);
}
else if (proximity >= 5 && proximity <= 6){
tone(tonePin,5000, 200);
}
else if (proximity >= 7 && proximity <= 8){
tone(tonePin, 1000, 200);
}
shiftOut(dataPin, clockPin, MSBFIRST, possible_patterns[proximity]);
digitalWrite(latchPin, HIGH);
delay(600);
noTone(tonePin);
}
Thanks for reading
gndtovcc.home.blog 
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