Nethu saluna...

credit should go to who have write this lyrics and
the unknown person who originally publish this lyrics in electronic format.
please click on the image to zoom it.

PIC USB RGB LED Notifier Part 0

following RGB LED notifier make me to do little experiment with pic18f2455.

http://eeegadgets.blogspot.com/2009/07/usb-mail-notifier-final-revision.html


based on this tutorial (http://pe.ece.olin.edu/ece/handouts/050201_lab1.pdf) i make
my first steps to making usb device out pic18f2455.following is the schematic i setup on the breadboard.

olin college tutorial comes with source coded for both pc/pic. you can find them here.i come up
with mplab project plus visual c++ program to control the led.

• mplab project download
• visual c++ mfc app download
  
• libusb project (which provides the driver / platform to access the usb device)
  

(seems Google blog not support store image files .i'll come up with a solution.if you need the code
drop me a mail to dilan2005atgmaildotcom)

hope to continue the story after i received my RGB LEDs.

great things...

To accomplish great things, we must not only act, but also dream; not only plan,but also believe.” santiz · Anatole France

Blue Ocean Strategy

found this interesting marketing/business management concept.
Blue Ocean Strategy vs Red Ocean Strategy
http://www.youtube.com/watch?v=HJH0g-EPGDs
http://en.wikipedia.org/wiki/Blue_Ocean_Strategy

a good summery
http://www.blueoceanstrategicplanning.com/news.htm

solar charger teardown

i bought above solar charger via ebay. my curiosity lead me to tear down the solar charger. unfortunately i didn't have a camera at the time of tear down but i was able to trace down the wiring of the components inside the solar cell charger.

The functionality of the charger as follows.the solar cell charger contains a internal rechargeable battery(unbranded Li-ion with protector circuit). this battery can be charge via solar power or usb hook to a pc. this internal battery can be used to charger your mp3/mp4 player or the cell phone.

the outer case made with metal alloy.By unscrewing two screws at the one end enable to slide the solar cell plus the electronics
out of the case.


above is rough sketch of the schematic.
the open voltage of solar cell measures maximum of 5.8v @ bright sun light .the solar cell is a good candidate for outdoor self powered device such as remote weather station , water tank level monitoring or small power sensor network nodes.
As on the schematic manufactures came with a clever trick to on/off the boost converter (U1) when external jack is plug to the socket.

NAND FLASH Basics

found a webinar form micron site which cover basics of NAND flash. worth to watch it!
http://www.micron.com/products/nand/nand_webinars