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Showing posts with label Arduino Lonely Project. Show all posts

Thursday, May 3, 2018

Arduino standalone Audio generation - How to play Audio Signals from Arduino without modules using PCM signals

In this post we'll see how to generate audio signals from Arduino without using any shields or modules.

PCM (Pulse Code Modulation)

Using Arduino and a speaker, you can generate audio signals as if they were coming out from an MP3 player.

Components

Arduino Uno

8 ohm Speaker

TIP 120 Resistor to be used as an amplifier.

Circuit

Just connect the amplifier transistor to Arduino and then connect them to the speaker.

Software
Download Audacity and then download software encoder from here.

Arduino code is included in this file.

Source: Instructables

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Sunday, April 29, 2018

Arduino Mosquito Repellent - How you can generate high frequency sounds with Arduino

It's a good practice(and it's a hobby of mine)to see a simple Arduino project that can be easily built from time to time.

Being busy makes us in need to manage our times efficiently to do many things we want to do.

He is a simple Arduino project that I wanted to share with you.

When I first started to learn microcontroller I used to blink that LED as a very primitive embedded software project.

I also wanted to make those signals make sense other than just blinking the LED.

So I used those microcontroller generated signals to drive speakers and buzzers to make sounds with different frequencies.

One of those reasons to make these projects was to make an electronic Mosquito Repellent.

As the legend says, high audio frequencies keep Mosquitoes away from you.

Of course, this turned out to be a hoax and you can try it for yourself. This simply cannot keep pests nor dogs away from you.

This only represents sound for them.

I've tried many circuits and Android App that generated high frequencies to repel Mosquitoes with no use.

However, the project is so easy and can be modified to be used as an Ultrasonic Ranging device.

I thought of modifying the code to make one piezoelectric transducer act as a transmitter and the other to act as a reciever.

I have many trnasducers of them so I want to try that project someday.

Components

Arduino Uno
PCB
Piezoelectric Disk
Header Pins
A breadboard (optional)
Wires
Soldering Iron

Soldering Lead

Connections

The circuit is very simple, one of the piezoelectric disk is connected to digital pin 9 and the other to digital pin 11. The left over terminal of both the disks is connected together and soldered to the ground terminal of the Arduino.

Circuit

Code


int speaker = 9;
int frequency = 31000;
int speaker2 = 11;
int frequency2 = 31000;

void setup(){
  pinMode(speaker, OUTPUT);
  pinMode(speaker2, OUTPUT);
}

void loop(){
  tone(speaker, frequency, 1000);
  tone(speaker2, frequency2, 1000);
}