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Somehow getting there...
After the string table addressing mode was understood, it only took one hour to let a text message skip through character by character.
Some while ago I wrote a scrolling algorithm using assembler, and this took me quite a long while. As well it is stretching over...
All the character data can now be read correctly.
It is written to the SRAM, read back and displayed.
I made A-Z rolling through today.
About 1K from 2K codespace is used right now.
Here for instance some code that is used to roll through the alphabet. Imagine if this would be...
I have started with this circuit some months ago, originally intended to use a second controller + serial connection.
It is too difficult to program scrolling message in assembler on the 16f59- only 2 stacks, and complicate banking scheme (small 16 byte banks).
However, I have rewritten the...
Two of my current projects are based on 18F PIC (18f24j10).
1: TFT color LCD, 50 Mhz, 512K FLASH. I had the idea to use infrared remote control as a means of keys input. There are many different protocols somehow. However it is possible to extract the bitstream, and display a sequence of...
No questions to answer this time!
I had an hour last night to begin reading through the book I bought. The first chapter served, as one would expect, as an introduction to the concept of the microcontroller (from now on uC) and gave a basic layout and description of the parts which make up a...
Well, a lot of views for my first post, and I'm very grateful and happy some people have found it useful! Even rated 5 stars!
What I'll do is address any questions I recieve, by PM, email, on the forums or even as a comment at the beginning and then add the new post.
Questions from #1:
1...
Well simply put, developement is not always easy, sometimes I am stuck with software, sometimes I had enough of soldering wires, and it happens that I have to search for a component.
Currently I am working at a small 1.8" TFT LCD circuit, I use PIC 18f24j10, not that it would be particulary...
I hope that this blog will serve many people who, like myself, could not find a definite and easy to understand list of the needs and the progression towards learning to program a microcontroller.
In this, my first post, I will talk briefly about my time trying to find a microcontroller to...
This is an LM723 used as a floating high voltage regulator. Same cautions as blog#4 apply AND there is no common mode input range listed on the datasheet so it might not adjust down to one tenth of the maximum output voltage. It's rather difficult to design a feedback loop for 1000 volts, so I...
This is a much easier to read schematic of Fig. 22 in the LM723 datasheet. It illustrates the connections required to get a regulator circuit to "float" on the output voltage. This one is designed for 1000 volts with a 50 ma constant current circuit.
Caveats: The MOSFET will dissipate 50...
I got inspired by one of the threads on the forum, and that ended up with this. My way of making a workbench/bread board powersupply.
The input source is a wall wart 30v 1.5A.
It's limited to regulate down to 12vdc and 5vdc. Nothing more and nothing less.
I design my schematics in Eagle, here...
Classic top down engineering. Put the people with the smallest understanding of the technical issues in charge of designing the "big picture" and then let those little engineer folks work out their silly problems. This is a consistent problem in corporation based product development. Until...
When you design a board, you might want to have a few exact copies of it. In Eagle, there is a way to make multiple boards, on one sheet of paper or transparent.
This is the way I do what is called Panelizing.
1. Design the board
First things first. While making the schematic, I have...
This project is licensed under a Creative Commons Attribution-ShareAlike license (essentially, it's free to use for any purpose, but any modification must also be shared the same way). See the footer for details.
This Lab PSU is based on the one displayed in the LM317 datasheet, named...
I've always thought that SMD soldering is hard. And I guess it is, when it comes to advanced circuits and SMD ICs.
I had my first try this evening. Both with SMD soldering, and etching with Ferric Chloride.
I've etched a few boards, and I've used Natriumpersulfate, at approximately 50°C. Lot...
I built this circuit while studying 1/2CV^2 = 1/2LI^2
The transistors I had were RCA brand 1B05 and the diode is a 2000 volt fast Trr diode.
Set the current by adjusting Vcc.
I used a single function generator to get a ttl square wave to allow current through the inductor under test, and...
I saw this information on this site and decided to "blog" it so it would be easily available in the future. It is about the turn on time of the diodes and was originally posted about a snubber question.
\begin{array}{l|c|c}
Time & 1N4001-5 &1N4006-7
\hline
.2 usec &.1A&
.3 usec...
This is a question that comes to the board, from time to time. I decided to make a list over some PCB manufacturers.
Usually a post starts with one of these questions:
"Where can I get boards done?"
"Who is best?"
"Which is cheapest?"
"Which is fastest?"
"Who can I trust?"
This is a listing...
