So far in this series we`ve had a diverse look at how Arduino can interact with a range of real-world devices from servo motors to ultrasonic range finders TVs to humidity sensors. Now we`ll see if we could get the Arduino to make a few sounds. We`ll actually do a bit better than that we`ll look at the importance of pulse width modulation (PWM
Click here to download the full size of the above Circuit.
) to microcontrollers by building our own digital audio player called Auduino. A few months ago I stumbled across a simple single-button digital audio player based around a Raspberry Pi developed by a guy for his 90-year-old grandmother who needed something simple to use. All it had was a single button and an LED and it was programmed to play digital audiobooks. The button pressed quickly would pause and play while holding it down for more than four seconds would play the previous track. I couldn`t help wondering if we could do something similar and simpler with an Arduino. Well you can. We`ve combined an Arduino Uno microcontroller a $1. 50 SD card reader module from eBay computer speakers and some other components to create a simple single-button digital audio player. There`ll be a small amount of soldering involved. Admittedly our player`s WAV file support is modest (mono 8-bit up to 19kHz) but the quality is still more than good enough to handle music and digital audiobooks. However don`t miss the bigger picture an audio player we can digitally control opens up a world of possibilities. If you`re wondering where you`ll find 19kHz/8-bit/mono WAV files we`ve got that covered. I`ve created an easy-to-use audio converter that integrates into Windows Explorer and converts any audio file into the required WAV format. You can even convert multiple files at the same time and it automatically turns those files into the 8. 3...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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