This project is about transducer. Here we just convert a non-electrical signal (e.g. sound) to a electrical signal (e.g. light). Here we mainly use a sound sensor and arduino nano. Code of this project attached with the slide.

1. Transducer Using PCB
Sound-to-Light Conversion And Loudness
Representation Using Light
Ahmed, Emran
ID: 14-26236-1
Course Instructor: Rethwan Faiz

2. What is a TRANSDUCER
• Basically, a device to transform ENERGY
• Collective term
• Has- SENSORS and ACTUATORS
• Sensors “sense”
• Actuators “manipulate”

3. Major Components
• Sound Sensor FC-04
• Arduino Nano
• LEDs

4. FC-04- the Sensor

5. A DYNAMIC MICROPHONE
• Does the opposite of a loudspeaker
• Loudspeaker
• Electric Signal  Sound Waves
• The Device we built
• Sound Waves  Electrical Signal

6. The LEDs and the Resistor
• 120 Ohm Resistor used
• Brown-Red-Brown-Golden
• Advantages of LEDs
• Cost effective
• Low input power
• Easy to use
• Higher efficiency

7. Arduino Nano

10. The Logic
• Range of values for different levels of loudness determined
• If the last range is not the same as this range
•  Turn all off
•  Display new ON-OFF sequence
• Else
•  Display ON-OFF sequence without turning off

11. • const int analogInPin = A0;
• int agerVal=-1;
• int count=0;
• int sensorValue = 0;
• void turnOff()
• {
• digitalWrite(9,LOW);//green
• digitalWrite(10,LOW);//red
• digitalWrite(11,LOW);//blue next to red
• digitalWrite(12,LOW);//last blue
• }
• void setup() {
• Serial.begin(9600);
• pinMode(9,OUTPUT);
• pinMode(10,OUTPUT);
• pinMode(11,OUTPUT);
• pinMode(12,OUTPUT);
•
• digitalWrite(9,LOW);
• digitalWrite(10,LOW);
• digitalWrite(11,LOW);
• digitalWrite(12,LOW);
• void loop() {
• sensorValue = analogRead(analogInPin);
• double db = (20.00 * log10(sensorValue / 5.00));
• if(db<46){
• Serial.print("db = ");
• Serial.println(db);
• }
• if(db <= 17.1468 )//17.15//17.1468 {
• if(agerVal!=0){
• turnOff();
• agerVal=0;
• } else count++;
•
• digitalWrite(9,HIGH);
• digitalWrite(10,HIGH);
• digitalWrite(11, HIGH);
• digitalWrite(12, HIGH);
•
• delay(50);
• }
• else if(db <= 17.9 )//18.25//17.8//20
• { if(agerVal!=1){
• turnOff();
• agerVal=1;
• //delay(5);
• }
• else count++;
•
• digitalWrite(9,HIGH);
• digitalWrite(10,HIGH);
• digitalWrite(11, HIGH);
• digitalWrite(12, LOW);
• delay(50);
• }
• else if(db <= 30 ){//19.35//38
• //turnOff();
• if(agerVal!=2){
• turnOff();
• agerVal=2;
• //delay(5);
• }
• else count++;
•
• digitalWrite(9,HIGH);
• digitalWrite(10,HIGH);

12. • digitalWrite(11, LOW);
• digitalWrite(12, LOW);
• delay(50);
• }
• //else if(db <= 46.205 ){
• else if(db <= 40.205 ){
• //turnOff();
• if(agerVal!=3){
• turnOff();
• agerVal=3;
• //delay(5);
• }
• else count++;
•
• digitalWrite(9,HIGH);
• digitalWrite(10,LOW);
• digitalWrite(11, LOW);
• digitalWrite(12, LOW);
• delay(50);
• }
• else
• {
• if(agerVal!=-2){
• turnOff();
• agerVal=-2;
• delay(50);
• }
• //turnOff();
• //else count++;
• //delay(10);
• }
• if(count>30){
• agerVal=-1;
• count=0;
• }
• //delay(10);
• }

13. PROBLEMS FACED
• Time wasted to find range of values
• Easier way- Serial Monitor
• Sound sensor HIGHLY sensitive. Reacts to wind
• Sound sensor cannot differentiate between sound frequencies
• PWM not possible
• Could not find proper Arduino Nano in Proteus
• Could not find FC-04 sound sensor in Proteus

14. USES
• At schools, to detect chaos, i.e., classroom supervision
• Sound pollution detection and visualization
• Clapping switch
• Security
• Spying
• At concerts
• In responsive disco-balls

15. IMPROVEMENTS
• Use of battery after uploading into Arduino (portability)
• Battery could be used with Arduino Nano Vin and GND pins (9V would be
needed)
• Better sound sensor, with frequency detection property, PWM
enabled
• If frequency sensor used, can be used to make equalizer from sound
• Better distanced LEDs for better understanding

16. Thank You!