Archive for the ‘Sound’ Category

Random number generator (Part 2)

Part 1, 2, 3 Here is a noisy signal sampled at 100 kHz with an Arduino UNO. The signal has 8 bits of resolution and the divider bridge of the final amplifying stage has been set so that the ADC range matches (without exceeding) the input signal range. Here is the illustration of a vector of 1024 […]

Web site of the day

Music has always been part of my life. And the means to listen to music has been a long way. From the 3 transistors amplifier taken from a broken toy record player to the A&R Cambridge amplifier. From the early shoe box home made speaker covered with wood looking adhesive up to the Magneplanar speakers. So that […]

Publication of the day

Students from the Vaughn College, Flushing, NY, USA published a very interesting paper  on Aid Device for Deaf Drivers. [Download here]. They use FFT in order to extract specific sounds such as honks from a noisy environment in order to trigger a vibrating device located in the drivers’s seat. As they used some of the information published on arduinoos.com, […]

PlainDSP plotter

PlainDSP plotter or From figures to pictures Thanks to a small yet powerful piece of Processing code which plugs immediately with PlainDSP library example sketches (wave plotter and spectrum plotter). More on this application on plaindsp web site

Publication of the day

We are glad to read that the PlainDSP kit is used in many, many different types of applications and many, many various places around the world.This publication, along with pending ones, bring the proof that open source based applications can be really powerful and regarded as serious games. Check this awesome insect detection based on […]

Doppler Effect

Have you ever wonder why the sound from the honk of a car changes as the car travels next to you. While in the same time, the driver of this same car swears that the sound of his honk did not change a bit while he was sitting in the car! Who is right? Well, have […]

Publication of the day

I am very glad to announce the first official publication involving the PlainDSP kit and the team behind the scene. We also congratulate Kostas and his team for designing such an awesome detector. Although PlainDSP kits can be used in the context of ludic applications, it provides all the means necessary for the design of much […]

[HOWTO] PlainDSP audio shield: M2M Communication system

The Critical Tinkers team recently achieved an amazing application based on the plaindsp kit. The M2M protocol they developed provides a smart way to send information to an Arduino board using a plaindsp audio shield from any sound emitting device (e.g. a cell phone). Next video is a teaser which demonstrates the principle of operation, as long […]

Breaking news

The content from the numerous exchange of mails and a careful analysis of visited pages on arduinoos show that many, many people from the planet of hackers, makers, learners, are very interested in advanced applications which mostly require digital signal processing functions. Not all Arduino fans had a chance to learn and practice DSP, so […]

PlainDSP (Part 4)

Part 1, 2, 3, 4 Here is the autonomous version of the sound meter which principle is described in PlainDSP (Part 3). The picture below shows the full schematics of the device   And here is the code of MicroSNDMTR_LCD, which includes the auto-ranging algorithm /* MicroSNDMTR_LCD: Micro sound meter connected to LCD 2×16 display Exemple of use of the […]