There are many ways to drive small current motors, those requiring 500mA or less but the L293H Quadruple Half-H driver is a versatile chip that was designed for use with motors, can very easily be controlled with a micro-controller and can be purchased JameCo Electronics. Using this chip we can drive either 2 DC motors or one Stepper motor and we will learn how to do both in this tutorial. The components needed to complete this exercise are an ATMega328p Micro-controller to interface with and control the L293D device but any controller may be used, the L293D component and one dc motor and/or one stepper motor.
While doing the research for this article I found that there is quite a bit of information on the net regarding this subject but one has to go to various places to get the whole picture so in this article I am attempting to gather all that information and offer it in one place, here! All examples are compiled using Atmel Studio 6.0 SP2 and the ATMega1280, but with a little customization can be modified to work with any Atmel Microcontroller.
In order to learn the assembler programming language some knowledge must be known about the hardware we are using. In this tutorial we will start with a brief introduction to the inner workings of the AVR micro controller then move on to pure assembler and finally show how to mix 'C' and assembler languages.
One of the most important functions in embedded electronics is the abitlity to communicate with other processors or integrated circuits and one of the primary ways that the Arduino Due can accomplish this is with the UART/USART Controllers. For those not familiar with this method of communications I recommend the Serial Communication article at Sparkfun.com.
In this edition of the continuing series of articles uncovering the mysteries of the Arduino Due we will be tackling the problem of creating a Pulse Width Modulation (PWM) signal. To do this we will use two techniques; first the old fashion way with a timer and secondly with the PWM Controller which is specific to the SAM3X8E processor. If you look at the pinout for the Arduino Due you will see that Pins 2-13 are set aside for PWM with 4 of them using the PWM Controller and the rest use the various timer channels.
The Arduino Due has 2 SPI units on board and when configured as Master uses 4 chip select lines to allow selection of up to 16 slaves per SPI unit. The SPI Controller is a sophisticated controller that can be configured in a variety of ways that should solve most serial communications needs.
This is the first in a series of articles that will cover the inner workings of the Arduino Due 32bit board based on the Atmel SAM3X8E ARM Cortex-M3 processor. Each article in this series will cover a discrete sub-system within the micro controller and in this first article we will begin with a discussion of the Parallel I/O controller.
The Flip jQuery plugin is a light weight extension that allows the user to type raw HTML and CSS in a textarea and have the ability to preview the formatted content in a div area without reloading the page. Use this extension in place of a blotted HTML editor like CKEditor when all you need is a simple light weight control.
3D Printer Filament, while not expensive per unit can add up when you have a number of rolls and protecting your investment against mositure is important. You could spend a lot of money on a prebuilt box but you can make one for a lot less, depending on options.
In the last couple of years the price of 3D Printers has dropped considerably and 3D Printing has become affordable for we mere mortals with models ranging from less than $200, think Walmart to many thousands of dollars. There are a lot of printers available offering various shapes, configurations and options because of this when I got ready to buy a printer I did a lot of research and asked for advice from friends that had printers, consequently I narrowed my list down to two printers that would fulfill my requirements.