L'électronique de zéro. ATmega168A Pulse Width Modulation – PWM - Protostack. 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. So You Want to Build Electronics. The equipment you need to get started in building electronics.
If you look back through the last two years of posts on this blog, you'll see my relatively rapid transition from absolute beginner in electronics to someone who is formidable enough to have their work at least noticed (See HaD every other month). This means I've been fielding a lot of questions from beginners online as to how exactly to get started, and what to buy, and what to do with it. And to answer this, I keep having to pull up the same links to the basic stuff. So lets say you're just getting into electronics and want to get really serious about it, or you're decently far into electronics and just want to see another person's parts shortlist, or you're me and my apartment burnt down right now and I have to restock my entire shop.
Arduino’s AnalogWrite – Converting PWM to a Voltage. 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.
ABCelectronique, portail de l'électronique. 10A H-Bridge Motor Controller - Introduction. 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. 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.
This is chapter twenty-two of our huge Arduino tutorial series. Updated 12/12/2013 In this chapter we’ll look at how you can measure smaller voltages with greater accuracy using the analogue input pins on your Arduino or compatible board in conjunction with the AREF pin. Arduino Tutorial - A detailed introduction on how to use LEDs. Tutorials. 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.
Fribotte : Base de données technique. LiIon_tut.pdf (Objet application/pdf) B e a . s t. [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. Apprendre l'électronique en partant de zéro. Using the I2C Bus. Motors and Microcontrollers 101. 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.
NerdKits - learn electronics with our educational microcontroller kit. DOCTRONICS home. 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. Diy › Intro. Les Montages Electroniques. Hobby projects - Simple electronic circuits. 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).