microcontroller projects

the 40 cents microcontroller posted by (C)tetsu-jp

this is a TSSOP IC. half SMD size! they cost 40 cents each! PIC microcontrollers are small CPUs with integrated RAM, and FLASH program memory. some models have USB, serial ports, A/D converters and much more.

this is one of the smallest and cheapest models! it only has 512 program words memory, as well 25 bytes RAM! and 20 MHz max.

What can they do? I made a small test circuit, which also includes a voltage converter IC. It can now run from 1.2 volts battery! these 16f54 chips can control small timers for instance, or small remote controls. They do not have integrated A/D for instance to measure light or temperature...and too small to control a LCD.

dcdc converter IC test circuit posted by (C)tetsu-jp

This is a larger PIC, which has 32K FLASH (I think), or even more, and some Kbytes RAM. It could control a graphics LCD, show kanji fonts however they do not hae built-in support for that. It has 80 pins, and the spacing is just 1/2 millimetres. Usually they are mounted by machines or robots, not by humans!

80 pins microcontroller posted by (C)tetsu-jp

Transistor circuit that I have researched, and now I made a new PCB revision. It can step up voltage from a 1.2 volts battery to about 3 volts! and it also works with 2 battteries! Small SMD parts are used but also an ordinary transistor.

new dc/dc converter PCB posted by (C)tetsu-jp

I wrote a web page: http://pic.mtfujitown.info/dcdc.html

and I have added it to eBay! You could buy it for just $4.98, and it is all yours! You could use it to replace 9v batteries, with 2x AAA cells, which will last much longer, and are cheaper. It can be adjusted a little as well, and has integrated high-efficiency SMD LED. It shows function! And it reacts to load current.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140499480925

I made a demo video!

so that is all for today!