Rustic Engineering

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Archive for March 2010

Lithium Polymer Battery USB Charger

with one comment

Finally I’ve finished this project. It’s a USB Charger for Lithium Polymer Battery, that’s very compact and high powerful batteries that I use in most of my projects.

A tiny and elegant charger...

All sides...

In my recent GUI Bot project I’ve used the famous MAX1555, a greatest IC in a tiny SOT23 package. One thing about MAX1555 that I don’t like is the current limitation it has (about 100mA). I know it’s for USB low speed compatibility, but who knows someone that don’t have a high speed USB host surround? Because that I use the greatest MAX1811. It’s a great IC too, but can deliver up to 500mA! See one of my first post to check more details.

That’s the finished work:

Working!

If anyone like this circuit, email to lubiana@gmail.com.

Written by forrequi

March 10, 2010 at 23:40

USB Small Peripheral Board (aka PIC18F14K50 Board) Finished

with 17 comments

Well, my board comes to me yesterday and I’ve soldered all parts. The board is really small, very compact, very robust. I’ve made a little test only to check if are something wrong, but not. Everthing works well. Very good for version 0.

See the photos:

Finished and empty PCB

Breadboard friendly

Programming via PICkit3

Now, I (and you, please contact me if you like it) can test and make nice devices, without boring with crystals, capacitors, reset, USB it self. You can attach it on a breadboard or your own prototype PCB with your circuit.

I’ve created a kind of pin card, for rapid pinnout reference. I got the card idea from Mbed project. It’s very useful, with all pins and ports plus the information about device peripherals.

USBLowPin_pinnout

Reference Card (like Mbed.org)

Think the nice things you can do… I want to make a test with USB Mass Storage Device, yes, a Flash Drive. I’ve a little project where this really help me with configuration storage, etc.

For test, I’ll show us some application example, like a USB RFID reader.

RFID Reader

If you like this board and want to get one, email me to talk about. It’s a zero version, so some errors could exist.

Cheers!

Eagle files here.

Written by forrequi

March 5, 2010 at 00:17