background preloader

The Scientist and Engineer's Guide to Digital Signal Processing

The Scientist and Engineer's Guide to Digital Signal Processing

The Museum of Unworkable Devices Physics Gallery Perpetual motion machine inventors do have principles. Unfortunately the physical principles they assume are often ones not obeyed by nature. Let's examine just a few. Anything is possible Inventors assume that since we haven't looked at every part of the universe nor have we looked at all possible mechanisms or phenomena, we can't rule out anything. Those who think this way are much like the child who puts two blocks in a box, closes the box, shakes it, then opens it, hoping to find three blocks inside. The "heavier on one side" seduction. The most naive level of perpetual motion seduction is the notion that if a system has more mass on one side of the axle, then that side must swing downward. We can test its stability by turning the wheel to any position whatever. The earliest unbalanced wheel of Bhaskara underwent countless modifications and embellishments over centuries. The situation is worse than that. The "more weight on one side" distraction. But this isn't a valid test.

Electronics Lab - Home Nature by numbers. The theory behind this movie We can find interactive sites on the internet (like this) to draw points, move them, and check how the structure becomes updated in real time. In fact, if we have a series of random dots scattered in the plane, the best way of finding the correct Voronoi Telesación for this set is using the Delaunay triangulation. And in fact, this is precisely the idea shown on the animation: first the Delaunay Triangulation and then, subsequently, the Voronoi Tessellation. But to draw a correct Delaunay Triangulation is necessary to meet the so-called “Delaunay Condition”. Notice that actually, given a certain number of points in the plane there is no single way to draw triangles, there are many. You see that in the graph below, extracted from Wikipedia: También encontraréis sistemas interactivos en la red, como éste, para ir añadiendo puntos, moverlos y comprobar cómo se actualiza la estructura. Podéis verlo en la siguiente gráfica, extraída de la Wikipedia:

Electrical Engineering News, Resources, and Community | EEWeb Welcome - Fritzing t r o n i x s t u f f Practical Arduino: News How to Connect Multiple Arduino Microcontrollers with I2C Use I2c to connect several Arduinos together to combine their power. I2C stands for the Inter Integrated Circuits and is one of the best Multi Master Serial Computer Bus technologies used in different systems to connect the peripherals of low speed data transmission. The technology was invented by Philips for TVs but is used in all sorts of applications including our Wiimote and Arduino tutorial. The I2C circuits follow a standard operational procedure where only two bi-directional lines, a serial clock, and a serial data systems are used.  There are recently improved versions of I2Cs available on the market which can hold a higher number of nodes and can perform faster than the rest. Don’t miss: Top 40 Arduino Projects of the Web You can use I2C then you will be able to connect more than one Arduino to a robot or other application and you can easily establish a network of sensors. How To Set Up Your I2C

Introduction to I2C In this article Grinan Barrett introduces us to I2C. Grinan explains how I2C works, provides many useful links to information related to I2C and example Arduino code for a robot project where multiple Arduino boards are used for sensing and control. Grinan submitted this article to uCHobby as part of the uCHobby Giveaway program. What is I2C? I²C uses only two bidirectional open-drain lines, Serial Data (SDA) and Serial Clock (SCL), pulled up with resistors. Typical voltages used are +5 V or +3.3 V although systems with other, higher or lower, voltages are permitted. The I²C reference design has a 7-bit address space with 16 reserved addresses, so a maximum of 112 nodes can communicate on the same bus. The maximum number of nodes is limited by the address space, and also by the total bus capacitance of 400 pF, which restricts practical communication distances to a few meters. Wikipedia Definition What exactly does the I2C protocol and usage mean to the average robot builder? x=1 x=2 x=3 x=4