How to program a 93C66 EEPROM chip with an AVR microcontroller? The 93C66 is a serially (MICROWIRE) Electrically Erasable Programmable ROM (EEPROM) chip with 4 kbit (4096 bit, can be ORGanized as 256 x 16bit or 512 x 8bit) memory space. Here a DIL version (which I will use in my moving message sign project) […]
93C66 EEPROM chip with an AVR microcontroller Read More »
Part list: 8x LED (red) 1x 180 ohm 1x 10k ohm 1x 33k ohm 1x 2u2/16V 1x 74HCT191 1x 74HCT132 2x 74HCT138 1x 78L05 1x 47uF/16V 1x 100n 2x 1N4007 Yet another version: Here an example with 4 TTL ICs. This is I think the cheapest solution with standard logic ICs. The 74HCT191 is a
16 LED Knight Rider using 74HCT138 microcontroller Read More »
This morning (2009-12-31) I built my 4th AVR programmer. USBasp. I built this one because I wasn’t completely happy with my 3rd programmer and because I want to play with a software USB stack. I do know that it works (I just reprogrammed 2 old projects just to try it out. Programming seems to be
Programmer UsbAsp using AVR microcontroller Read More »
The programmer I use is built from a kit I bought at Tuxgraphics. There are several reasons I bought this kit. It is open source, works with avrdude. It connects to USB. It is a lot faster then my old programmer (Programs an ATMEGA8 in about 5 seconds). It is cheap. I bought the kit
Programmer using ATMEGA8 microcontroller Read More »
Have you ever seen a business card with a computer chip embedded on it? This one does. It has an ATtiny85 microcontroller chip that stores all your personal details. You plug it into an USB port of your computer, and find the details about the person opened into a text editor. The firmware uses V-USB
USB business card with a computer chip board using ATtiny85 microcontroller Read More »
If you cannot afford to buy a USB programmer for AVR, don’t worry, you can make one by yourself. This programmer uses a Atmega8 microcontroller with a few external passive components. The good thing is you don’t need any USB controller because it is implemented in the firmware inside Atmega8. Yes, you are right, you
Open Source USB AVR Programmer for Students and Hobbyists using Atmega8 microcontroller Read More »
“V-USB is a software-only implementation of a low-speed USB device for Atmel’s AVR® microcontrollers, making it possible to build USB hardware with almost any AVR® microcontroller, not requiring any additional chip.” For further details on V-USB and licensing, visit http://www.obdev.at/products/vusb/index.html This is a data logger project that reads an analog signal, converts into digital number,
Easy Data Logger with Virtual USB using ATtiny45 microcontroller Read More »
When I was first working with AVR microcontrollers, I relied a lot on tutorials I found on the web, but nearly all of them raised the question of how to attach a programmer to the microcontroller when you aren’t using a development board. Most of the time, I would see people shoving pieces of wire into the
ISP Breadboard Header using AVR microcontrollers Read More »
So, you want to program a bootloaded AVR. Or possibly, you have an Arduino Lilypad and no way to program it. There are a few solutions available to you: You could buy a USB to FTDI adapter (available at Adafruit, Sparkfun, etc), you could buy a simple FTDI cable, or you could build something. I
Arduino FTDI Header using ATmega8 microcontroller Read More »
If you are just getting into microcontrollers there’s alot to know as you have likely found out. There’s alot of good online tutorials for the Atmel AVR’s and chances are you have see a few of those by now. I recently got into microcontrollers and didn’t know jack about it. I wanted to have some
How to control a 16×2 LCD using an AVR ATtiny2313 Read More »
