Manufacturing circuitboards containing SMD-parts with toner-transfer is nearly impossible. The thin traces almost never get transferred completely to the copper. One solution to this problem is to use photoresist boards and expose them with UV light. The layout is printed onto a transparency, which is then used as a mask for the photoresist. I got […]
UV Exposure Unit & Etching Read More »
For a long time I had a layout for this circuit, but could never build it, because the layout was to small to be made by tonertransfer. So it was the first layout I made with my new exposure unit. It’s quite small, so it fits under the LEDMatrix itself. Therefore only SMD parts are
8×8 Bicolor LED Matrix using MAX6964 Read More »
Due to university and work it has been a while since the last post. But I just completed a little project that’s worth posting. Several old 27C256 EPROMS were lying around unused. So I thought about a purpose for them. As I also had some 8×8 LED matrices, a little animated display came to mind.
EPROM Display using ULN2308A microcontroller Read More »
And now for something completely different: A little robotics project for the weekend. The described robot can be build entirely from model making supplies and materials from the hardware store. Also only very few tools are needed. A metal saw, a drill press, a vice and optionally a tap will suffice. And here you can
Delta Robot using atmega32 micrcontroller Read More »
Here is a very simple project of controlling a small DC-motor (taken from an old personal cassette player) with ATmega8. The ATmega8 is having three PWM channels, out of which two are used here. PWM waveforms are fed to MOSFET (RFD3055) H-bridge. Here, direction is controlled using a two-position toggle switch and speed of the
Simple PWM DC motor control using MOSFET H-Bridge with AVR ATmega8 Read More »
Introduction: (don’t skip to read the note below) I recently purchased few AVR microcontrollers. I don’t know much about AVR since I am using it for first time. Any way, I have some experience on working with PIC and MSP430. To program AVR using USB, I came to know that USBASP is the best and
My own AVR ISP programmer using PIC16f877a and python! Read More »
For those who are trying to make AVR kit at home, an AVR programmer which can be simple to make will be really useful, as it’ll avoid buying the programmer!! Here I’m giving a few webpage links on how to make a programmers yourself. – Here is a simple AVR serial programmer, works with PC
DIY AVR Programmers Read More »
Introduction: Switching multiple tasks on a same CPU is the one of the major function of an operating system. What I did now is a time sharing multitasking (time multiplexing) on an AVR. Here an atmega32 is configured to use Round-Robin Multitasking. Round-Robin allows quasi-parallel execution of several tasks. Tasks are not really executed concurrently
Multitasking in AVR (A demo to run 7 tasks on an atmega32) Read More »
Introduction: This is just a time pass hobby project, I am trying to display some pictures (JPEG/PNG/BMP etc) on my 8×8 led dotmatrix display. You can see photos of my 8×8 led dotmatrix display showing some grayscale pictures. The main thing which you may notice is that the brightness of each led depends on the
Introduction: I have learned some thing about TV in one of my B.tech semester but I forgot most of them. Now I refreshed a few basics and tried to implement a monochrome PAL TV signal generator using an AVR micrcontroller. I was using PIC earlier but later I jumped to AVR because I loves the
AVR based monochrome signal generation for a PAL TV using atmega16 micrcontroller Read More »
