lunes, 12 de marzo de 2012

Redesign: how does it all work?

Very cool experiment!

Not quite working, yet

There is still a lot of work to be done.

Some changes have been introduced to the active electrodes, trying to make them simpler, higher shielding, silver plated connectors, ...

As any good entry, here is a pic of the system actual status.

Next step will be redesign the hardware and perform some tests and simulations before mounting the whole system together. Old-school-baby-steps methodology has never let me down :)

lunes, 27 de febrero de 2012

Board is under construction ...

The board has its components already soldered. Short-circuit tests have been run and connections need to be added. Possibly the whole system in addition to the microcontroller would be boxed, not only to keep it neat and tight but safe from possible ESD (Electro-Static-Discharges), since I finally didn't include this block to simplify.

The milling machine

The LPKF ProtoMat® S42 introduces a new entry-level circuit board plotter for in-house rapid PCB prototyping. This compact system provides precision and performance for quickly and easily milling and drilling circuit board prototypes in a single day. In-house PCB prototyping eliminates production delays and the high cost of outside vendors, reducing a product's development time and time-to-market dramatically. Design data also remains securely in-house and under control. The S42 in particular is a perfect entry-level tool for educational and other settings where economy is a critical issue.


jueves, 23 de febrero de 2012

Parts have arrived! :)

Circuit design completed v1.0

The first version of the board is completed and ready to etch!

Circuit schematic:

The schematic illustrates self explanatory dashed blocks and a name describing its main functionality. Together they form the whole structure of the "main" board. This acts as an interface between the microcontroller and AE (Active Electrodes, i.e. sensors).

PCB schematic:

First an image capture of the layout "as it is".

Secondly, we can distinguish the different sections that form the block-structure described above.

New version pending: shield-arduino compatible ...