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3 Aug 2008

If you want to build a simple and inexpensive digital voltmeter here is a mini 3 digit display digital voltmeter (this one PIC version).It’s an AVR based voltmeter module.The module has general purpose digital IO pins. You could use it as well to read a digital sensor and display the value.It can be freely programmed, calibrated and even be programmed with a non linear formula. It’s a display where you can define the relation between the measured value and the displayed number. [via]

Mini 3 digit display digital voltmeter - [Link]

25 Jul 2008

Linus Akesson and friends have created the “Craft” demo – using an ATmega88 to generate 4 channels of 8-bit sound and 3D graphics. [via]

Timing is crucial: One display line takes 24 μs, and is followed by a 7.75 μs break called the horizontal blanking period. After 480 such lines, there’s a longer break (1428.75 μs, equal to 45 full display lines) before it all starts over. Two digital signals are used to synchronize the sender (graphics card, custom demo hardware etc.) and the receiver (monitor).
Sound is generated during the horizontal blanking periods. That gives a sample rate of 31496 kHz. Of course, only the really timing critical part (waveform generation) is performed during the horizontal blanking. Melody, rhythm, amplitude envelopes, arpeggios etc. are handled by a playroutine which gets called once for every video frame, during vertical blanking.

AVR demo platform rocks the color VGA +audio - [Link]

28 Jun 2008

This page describes how to communicate with HD44780-based LCDs (Liquid Crystal Displays) using an Atmel AVR microcontroller.In many microcontroller applications some sort of display is needed to present information and status of the controller to the user. Although a few LEDs can provide a lot of information, a more advanced display is sometimes needed. A solution which is quite often seen is using a HD44780-based character LCD module. These modules come in various configurations from one line of 8 chars to 4 lines of 40 characters. [via]

Using HD44780-based LCDs with AVR microcontrollers – [Link]

5 Jun 2008

This is an open source development board for ATMEGA8 builded especialy for Linux users. This development board is perfect for all the newbies that want to learn about AVR Microcontrollers or want to build some nice projects with it. [via]

ATMEGA8 DevBRD – [Link]

1 Jun 2008

Bascom can handle the two main types of liquid-crystal displays: alphanumeric and graphic. For the time being we will concern ourselves with the most common alphanumeric type. This type of LCD can display characters, numbers and special characters. The most common type of alphanumeric LCD uses a Hitachi HD44780 as display controller. When you are uncertain about what type of display you are holding in your hands, simply look at the chip designations on the back. If one of these says HD44780 you’re safe. [via]

Bascom and AVR, Using an LCD - [Link]

29 May 2008

In this article we will see a state of the art USB programmer for the AVR microcontrollers from Atmel. The programmer firmware has no device dependent data. Therefore it works for almost any AVR microcontroller on the market and possible future microcontrollers. [via]

open source Atmel AVR Programmer with USB interface - [Link]

25 May 2008

If you are a fan of AVR and you need to disable RESET pin and use it as regular pin you will need a High-Voltage programmer of AVR microcontrollers.HVProg is a nice High-Voltage parallel programmer.It is a redesign of the original STK500 without all components of a development board. It is based on the original ATMEL schematics that are freely available on the net (i.e at avrfreaks.net). The main target was to keep all nessecary functionality to programm all available AVR controllers in every programming mode that the STK500 supports. [via]

HVProg-High-Voltage programmer for AVR – [Link]

13 May 2008

This is an USB HID gadget, capable of converting CIR signals from a remote control to keystrokes and/or mouse movements. It uses an ATMega8 AVR microcontroller and the Objective Development firmware-only USB driver stack.The device contains a TSOP1738 infrared receiver & demodulator, which picks up the signals from the remote control. The microcontroller implements a combo HID device, simulating both a mouse and a keyboard. This way it can send mouse movements, button clicks and keystrokes (such as PageUp, PageDown, Enter, Escape, etc.) to the PC. [via]

InfraHID - [Link]

13 May 2008

This is very simple AVR programmer via parallel port.Here you have the diagram for a little board containing just a a zip-socket for the uC, a crystal and very few other parts. [via]

Simple AVR programmer - [Link]

12 May 2008

This is a simple IR receiver circuit which plugs into a serial port of a computer. Althrought, there are many other circuits of this kind, and most of them are even simpler, but this circuit has two major advantages: (1) it uses an Atmel AVR RISC microcontroller (an AT90S2313) instead of the usual PIC microcontroller and (2) it uses a Maxim MAX232 for the generation of valid RS232 levels. [via]

AVR-Based Serial Port IR Receiver - [Link]





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