One of the projects in Practical Arduino is the “Online Thermometer”, which combines an Ethernet shield with a number of DS18B20 1-wire temperature sensors to allow you to read multiple temperatures and make the values accessible using a web browser. In that project I chose a specific model of Ethernet shield that was available at
Online Thermometer using Arduino Continue Reading
In theory, it is quite simple to perform sound localization by measuring the phase difference of signals received by two microphones that are far apart in space. The devil is always in the details. I have not come across any project made for Arduino like this before, and I am wondering if it is even
Sound Localization using Arduino Continue Reading
The laser harp is a musical instrument made of light. A fan of beams shoots up from the floor into the night sky. The performer can create music by placing their hands in the beams. Not only does “breaking” the beam produce notes, but sliding the hand along the beam will also change the sound.
BUILD YOUR OWN LASER HARP using Arduino Continue Reading
DAC is short for Digital to Analog Converter. In this article we play around the code Michael Smith created for a PWM based DAC. I modified his code so that other DAC options could be tried. I compare the 8-Bit PWM DAC with the R2R DAC at various numbers of bits. You might be surprised
Arduino Audio DAC Options Continue Reading
The basic idea was to create color organ / spectrum analyzer on arduino board, trying to minimize quantity of external components, like analog filters, LED display drivers, etc. Spend a lot of time in search on internet I was able to find only two ! project , which implemented FFT in order to solve a
Spectrum Analyzer, Arduino project with FFT algorithm Continue Reading
The idea of using triangulation for distance measurements is well known since Pythagorean time, when his brilliant formula become available for mathematicians. What is new in this design, is lasers power control via “blooming” effect of CMOS camera. Here this “negative” effect was put to work instead of ADC. No need high price “no-blooming” camera!
ARDUINO Laser 3D Tracking or Range Finder Continue Reading
The easiest way to connect an audio signal to your arduino, is to build a simple 3 components (2 resistors plus cap) circuitry shown on the first drawings on right side. Disadvantage: there is no amplifier, and consequently sensitivity would be low, hardly enough to work with headphones jack output. For low level signals, like
Audio Input to Arduino Continue Reading
Recently I was reviewing one of my oldest project, and decided to “refresh” previous design by taking full advantage of the new arduino Leonardo board. Based on AtMega32U4, which include PGA (programmable gain amplifier), oscilloscope’s analog front end doesn’t require external OPA this time, end could be build in 1-2 hours on prototype board, using
Quasi real-time oscilloscope using Arduino Continue Reading
Communicating with a host computer can allow a simple Arduino-based system to gain access to a wide variety of devices and information. Most people link an Arduino to a host using serial communications across a USB connection with custom code running on the host to send information to the Arduino or receive it in return,
Virtual USB Keyboard Using Arduino Continue Reading
The other day I was confronted with an interesting problem, I needed to control a series of lights from an interaction on a computer screen and it had to be as inexpensive as possible. I instantly thought of an Arduino. It had everything that I needed, more than enough I/O, an integrated USB and its only
How to control LED’s with Processing and Arduino Continue Reading
