Bonjour à toutes et à tous ! Si vous êtes ici, même s'il s'agit d'un hasard, c'est qu'il y a une très grande probabilité que vous ayez envie de vous documenter ou d'apprendre l'électronique. Quels sont les principes de base ?
Dimming an incandescent bulb is easy. Simply adjust the current down using a potentiometer and you are done. Dimming an LED is another story entirely. When you reduce current through an LED there are unintended consequences like color shifts and dropouts. ATmega168A Pulse Width Modulation – PWM - Protostack
So You Want to Build Electronics
D-A_converter When I first started working with the Arduino platform (it was also my first experience with microcontrollers), I was a little surprised that analogWrite didn’t actually output a voltage, but a PWM (pulse-width modulated) signal. After all, the ATmega had a A-D (analog to digital) converter along with Arduino’s analogRead. The complementary analogWrite function was there, but no D-A (digital to analog) converter on the AVR chip itself. Fortunately, there is an easy way to convert a PWM signal to an analog voltage. To do so you only need to implement a simple single-pole low pass filter. Arduino’s AnalogWrite – Converting PWM to a Voltage
The Quintessential PIC Microcontroller
Motor control is the core heart of robotics. Without locomotion or any movement a robot is dull and lifeless. The H-bridge is a tried and true concept for DC motor control. It allows you to move motors forward, backward and with varying speeds through PWM (pulse with modulation). This tutorial will take a few steps back from the all-in-one L298 or LMD18245 motor control ICs and look more into how we can build our own H-bridge without the need of an IC. At first this might sound like a difficult task. 10A H-Bridge Motor Controller - Introduction
Lab 14: Inter-Integrated Circuit (I2C) communication I2C (Inter-Integrated Circuit) is a short distance serial interface that requires only 2 bus lines for data transfer. It was invented by Philips in 1980′s, originally to provide easy on-board communications between a CPU and various peripheral chips in a TV set. Today, it is widely used in varieties of embedded systems to connect low speed peripherals (external EEPROMs, digital sensors, LCD drivers, etc) to the main controller. In this experiment, we will cover an overview of I2C protocol, its implementation in PIC microcontrollers, and the method of connecting single and multiple devices on a common I2C bus. We will demonstrate the technique by connecting two I2C EEPROM chips (24LC512) and an I2C compatible temperature sensor (DS1631) with PIC18F2550 microcontroller.
Tutorial 10 for Arduino: Interrupts + Debouncing This video was featured on Hackaday.com on 3/8/2011 This tutorial was featured on the official Arduino blog on 3/9/2011 Interrupts are an extremely useful, yet often feared element of microprocessors. Interrupts allow you to run a program, while still being able to react to asynchronous input from the outside world. On many platforms they can be confusing to implement, but the arduino makes it easy!
Arduino and the AREF pin Learn how to measure smaller voltages with greater accuracy using your Arduino.
Arduino Tutorial - A detailed introduction on how to use LEDs
The most fun you can have (after blinking LEDs) is using sensors to detect whats going on in the world and act on that information. However, all sensors have their own methods of interfacing. That can make them a real pain to work with: some need pull-up resistors, some need certain power supplies, some use lots of power, some don't. Since there aren't that many different sensors that people tend to want to use I have collected the most common sensors with code examples and wiring diagrams. Tutorials include: Force sensitive resistor - Used to detect physical pressure such as pinching, squeezing, pushing, brushing. Tutorials : Adafruit Industries, Unique & fun DIY electronics and kits
Fribotte : Base de données technique Vous trouverez dans ces pages des fiches techniques vous donnant tous les infos pour réaliser des éléments de robots. Vous pouvez les assembler pour en faire un robot complet ou vous inspirer de ceux que nous avons réalisés et décrits. La difficulté des pages est signalée près du titre par un F comme Fribotte :
LiIon_tut.pdf (Objet application/pdf)
[an error occurred while processing this directive] Magnetic Levitation using Hall effect Sensor Feedback, and Matched resonant wireless power transfer This work was completed initially for a final project for Joe Paradiso's class MAS.836 - Sensor systems for Interactive Environments, taken Spring 2oo5. b e a . s t
Apprendre l'électronique en partant de zéro
Using the I2C Bus
Electric motors are a key way of converting electrical power (voltage and current) into mechanical power (torque and speed), and because electric motors are simple and reliable machines, they can be found all over, in many different shapes and sizes. Just considering a normal (gasoline-powered) car, there are a great number of electric motors: the powerful starter motor and alternatoralternating windshield wiper motorsintermittent-use power windows and door locksthe blower fan that moves hot and cold air into the cabinthe tiny motors inside the CD player And I'm sure you can think of others. But from an electronics perspective, motors are slightly tricky loads to control -- they're not just a resistor! Even for a single applied voltage, their current varies with loading, starting, and stopping, and the energy stored in the magnetic field of the windings means that they are inductive, which can present a danger to other circuit components if it isn't handled properly. Motors and Microcontrollers 101
Robotique - Index des projets
Notion de Résistance Électrique et la loi d'Ohm
RadioLocman free electronic diagram circuits components schematics diagram data sheets semiconductors engineering for engineers and amateurs
Réalisations - Alim. led Electronique > Réalisations > Alimentations > Alimentation d'une LED Dernière mise à jour : 30/12/2012 Présentation Les lignes qui suivent décrivent comment utiliser une LED de façon isolée ou en groupe, avec des tensions alternatives ou continues.
diy › Intro
Les Montages Electroniques
Computer microphones Learn how to interface electret and dynamic microphones to the standard computer sound card. Metal detectors Theory of operation and schematics of the most common metal detectors used today: Very Low Frequency (VLF), Pulse Induction (PI) and Beat-Frequency Oscillator (BFO). Wireless microphone