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Hardware

AT89C2051 programmer update

After playing for about one week ([url]http://blog.billy.gr/archives/2004/12/15/at89c2051-programmer/[/url]) with that i can say that i am really satisfied. I did a lot of changes till the final design.

Now i must as usual create a PCB and a couple of html pages (or PDF) with the notes, parts and schematic.

Categories
Hardware

Stepper Controller

Today i finished a stepper motor controller. It is a simple board made arround a AT89C2051 and 4 power transistor. I had some issues with the power supply (i need more current than it can give to me).

The design is simple: 1 pin for step, 1 pin for direction. On the todo list is to create a serial protocol in order to use it directly using commands.

So far it works with no problems but i need to create a PCB first in order to do more tests and add some safety features.

Categories
Hardware

AT89C2051 programmer

I allways wanted to make a at89c2051 programmer. The only programmers that i have is one for AVR and can program also the AT89S8252, another one for DS5000/DS2250 which i use for evalution and fast programming for the 8051.

Doing a search on google a came across to the following link: [url]http://chaokhun.kmitl.ac.th/~kswichit/easy1/easy.htm[/url]

The source code is under GPL and you can compile it using sdcc. My favorite embedded compiler.

This guy have build a really nice programmer, with only one problem…. The chicken – egg problem.

How i will program the 89C2051 in order to program the target 89C2051 ? 🙂

I took the source and import it in my cvs. Yes cvs, allways cvs. I did a clean up of the code in order to compile without warnings, and start doing changes for my board.

The board i designed is allmost the same but instead a 89C2051 i use an AT89S8252 and i don’t need a latch cause i have a lot of spare pins in order to program the target processor. Of course in my todo list is to make this board good enough to program all the processor i use, and ofcourse program also some time of memory, such as serial, I2C and so on.

I hope i will have finish it in the weekeend

Categories
Hardware

My Psion 5MX died….

My Psion 5MX just died….

The usual problem with the lcd. Yesterday night was working without any problem. Today i opened it and i had a few horizontial lines on the lcd.

The lcd cable has left us… I hope i will open it again on the weekend to see if i can fix it.

I bought it if i remember correctly on 1999, and i was using it till i got the 9210 communicator. After that i was playing with linux on it.

To bad, i wanted to do some experiments this weekend. Bye bye my friend