The original version of xTimer used MAX7219 for driving 7-segment. This new design uses a cheap CMOS shift register, 4094 for LED interface. Each 4094 drives a 0.5″ 7-segment without the need of limiting resistor. The left-hand LED is timer function with buzzer alarm output. The right-hand is for clock display. Hardware Schematic Fig. 2 […]
xTimer with 4094 using ATMEL89C2051 microcontroller Read More »
Its a digial clock which make use of AT89C4051 to work as a Real time clock. Figure 1 shows the circuit diagram for the digital clock. Port 1 of the controller (AT89C4051) is used as the data lines for the LCD (starting from pin 7- pin14 of LCD). As you can see there is not
AT89C4051 to work as a Real time clock Read More »
Introduction Approach used for creating the pure sine wave described in this paper is done through manipulation of mathematical representation of the original sine wave. It is done by dividing half the sine wave into m (even number) segmentations, where area under a quarter of the sine wave from 0 to π/2 resembles series of
Mathematical Manipulation of Pure Sine Wave Inverter Using Atmel 89S2051 Read More »
This is my first AVR-project on this page. The DiSEqC-Tester allows to test DiSEqC-switches that uses 1.0 or 1.1 protocols. (DiSEqC-Switches with 2.0 and 2.1 protocol have backwards compatibility with 1.0 & 1.1 respectively and also may be tested). The device every second sends a DiSEqC-message that makes switch a DiSEqC-switch. Four LEDs are intended
Testing Device for DiSEqC-Switches using ATtiny13-20PI Read More »
AVR IR Downloader is one of final assignments at Electrical Engineering Brawijaya University of Malang, Indonesia. The basic idea was came from our lecturer at campus, Ir. Nanang Sulistyanto. If this project was successfully made, it will be used to program our automatic machine’s uC during the testing schedule. Actually we are using Atmel AVR
Atmel AVR Infrared Downloader using ATmega8 Read More »
LCDs are often used in microcontroller projects. Most used are these green character displays with two or more rows to display menus, status or debug messages. With mass production of mobile phones, color LCDs get that cheap, that they can be used as replacement. Some time ago I ordered a Nokia 6100 LCD including breakout
Flickr images on a Nokia LCD using ATmega48 Read More »
Introduction. Nowadays, USB is the most popular connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, “use a USB to Serial adaptor to connect your AVR ISP with your PC”. Yes, that could
USB AVR in-system Programmer using ATtiny2313 Read More »
A simple signal generator which produces sine waves (or any waveform really) at audio frequencies using DDS and is controlled a USB serial connection. Only 2 chips are used in this circuit. The AVRATmega88 which produces the signal, and an FT232R for the USB interface. While a computer is required to control the varying frequency
USB controlled DDS signal generator with ATmega88 Read More »
Why Stk500 and USB? Until the beginning of this year a simple parallel port programmer was the only good programmer as it could be used for any device. All device dependent information is stored in the programmer software on your computer. The problem is however that the parallel port is slowly disappearing. Apple does not
AvrUsb500 — an open source Atmel AVR Programmer using ATmega8 Read More »
Compatible with AvrStudio Supports all AVR Controllers Parallel and serial High-Voltage-Programming Small and easy layout with only a few parts STK500 protocol Schematics and board layout available Introduction The project started as an enhancement of Martin Thomas Evertool project. He has rebuilt the AVRISP and JTAG adapter with only a few parts. Unfortunately they
HVProg using ATmega8535 microcontroller Read More »
