This is a magnetic levitator implemented using Atmega8 microcontroller. Magnetic levitation is a method by which an object is suspended with no support other than magnetic fields. To make a magnet levitate, an hall sensor is attached to a coil. The coil acts as an electromagnet, and the hall sensor measure the distance of the magnet from the coil. …
Story I have a nice “carranca” (or wall mask) from Chile that stands in my corridor. It’s a very beautiful decorative mask that I liked from the very first moment I saw it at the shop. Few weeks ago I wondered if I could bring it to life by adding a motion sensor and some …
The assembly code given here was written to see what it would take to make an AT90S1200 generate 8 channels of proper PWM. In this case, by proper, I mean with the maximum high frequency content consistent with the needed duty cycle and give clock. Take a look at the scope shots below and notice …
8 Channel PWM using AVR microcontroller Using Atmega Read More »
Described are the waveform capture method, example firmware and hardware designs. This material formed the basis of an article that was first published in the October, 2003 issue of Circuit Cellar magazine. The only components added to the operating Atmel AT90S2313 circuit (one capacitor and two resistors) to allow waveform sampling with < 1 microsecond resolution …
PWM Waveform Capture using AVR microcontroller Using Atmega Read More »
Sometimes when tuning various electronic hardware we need simple signal generator with various waveform and frequency. One of the options is to by a professional with variable gain professional coating and many additional functions. But if you are an amateur you might want to build one. This small project is dedicated for building one of …
Description A long time ago I bought a couple RGB rotary encoders from Sparkfun because they were cheap and I was already spending a bunch on other stuff. I thought they would be neat for some interfaces since it includes a push button. The interrupt service routine (ISR) for pin changes on the rotary encoder (for terminals …
RGB Rotary Encoder with PWM and ISRs Using an ATmega328 Read More »
This article is in continuation of PWM generation using AVR timer. In the previous article, PWM generation using Phase correct PWM mode is described. However, there are some applications like DAC, power regulation and rectification etc. which require high frequency PWM wave. The PWM generation using Fast PWM mode is suitable for such applications. This article focuses on Fast …
In many applications, it is important to control the speed of DC motor where precision and protection are essence. Here we will use a technique called PWM (pulse width modulation) to control the speed of DC motor. We can achieve speed control of DC motor using mechanical or electrical techniques but they require large size …
PWM Based DC Motor Speed Control using Microcontroller Using Atmega Read More »
In this project we are going to use one of the features of ATmega32A to adjust the brightness of 1Watt LED. The method that is used to adjust the speed of LED is PWM (Pulse Width Modulation). The method of PWM is explained here. Consider a simple circuit as shown in figure. Now if the switch in above …
Pulse Width Modulation (PWM) is a technique widely used in modern switching circuit to control the amount of power given to the electrical device. This method simply switches ON and OFF the power supplied to the electrical device rapidly. The average amount of energy received by the electrical device is corresponding to the ON and …
Working with Atmel AVR Microcontroller Basic Pulse Width Modulation (PWM) Peripheral Read More »
