I had the opportunity last week to interview Murray Harms from Queensland Australia, and talk to him about his home made Iron Man Suit. He built it with his son for Halloween and as you can see below, it looks pretty amazing. What inspired you to make the suit? Well each year my 22yr old...
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. A better way is to use Pulse Width Modulation (PWM). With PWM the LED...
We released the 28 Pin AVR Development Board back in 2008 and since then it has gone through many iterations. This week we release version 1.6 which adds 4 improvements. These improvements were based on customer feedback and we are very grateful for the feedback. Please keep it coming. What has changed? The size of...
Back in February, we wrote a post on Analogue to Digital Conversion. Many people mentioned that it was a bit light and they would like a more advanced tutorial. Well here it is... In this tutorial we add a second analogue input and use the ADC Conversion Complete interrupt. The circuit we are using is...
Many AVR microcontrollers are capable of doing Analogue to Digital Conversion. The ATmega168 has 6 ports (8 ports on the SMD packages) that can be used for analogue input. This tutorial shows you how. The circuit We'll be building the following circuit on a breadboard. The Breadboard layout is based on the Atmega8 breadboard circuit...
EEPROM (Electrically Erasable Programmable Read Only Memory) Is non-volatile memory, meaning it persists after power is removed. The ATmega168 microcontroller has 512 bytes of EEPROM which can be used to store system parameters and small amounts of data. This tutorial shows you how to read and write EEPROM. Overview Our code examples will be very...
Recently a friend asked me, "What do I buy if I'm just starting out with embedded systems and want to learn?". I told him a breadboard solution would be best and started rattling off all the bits that he would need. Then I got thinking, what if we made this a kit? So here it...
This tutorial will teach you how to use external and pin change interrupts on an AVR microcontroller. I will be using an ATmega168. The general principles apply to other AVR microcontrollers, but the specific vary greatly. What is an Interrupt? Imagine your are sitting at your computer, reading this post. The phone rings and you...
The ATMEGA168 Development Kit now comes with 10 extra components for the power supply block. Specifically that includes: 1 x Resistor - Metal Film 1/4W - 1K 1 x LED General Purpose 5mm Yellow 1 x DC Jack 2.1 x 5.5mm 1 x 1N4004 General purpose 1A Rectifier Diode 1 x L7805 +5V Linear Voltage...
Version 1.5 of the 28 Pin AVR Development Board is now available. As before we have incorporated a number of changes that people had asked for. The most notable change is a figure-8 shaped hole for mounting the voltage regulator. This configuration allows for both Input/Ground/Output (IGO) and Ground/Output/Input (GOI) style voltage regulators. Other changes...