Laser projector project: Ethernet board

I designed and assembled 100% of this board: schematic capture, board layout, assembly, and firmware.

 

We have:

 

* On the right: Ethernet port, blue power LED and green/yellow status LEDs for network. Also have a couple pulse transformers for isolation: required by the spec. Also a number of passives required for ethernet.

* On the upper-right: linear regulators for power, capacitors, rectifier.

* 28-pin DIP: this is the Microchip ENC28J60 chip used for Ethernet. Has an SPI interface for a low pin count. Runs on 3.3V supply.

* 40-pin DIP: Atmel AVR chip. Runs the open-source uIP stack. Runs on 5V logic.

* 16-pin (?) DIP between Atmel and ethernet chip: level-shifts from 3.3V to 5V.

* Top header (currently in use): exposes SPI pins, among others.

* Left three 10-pin headers: generic I/O ports which can be used for whatever a project requires.

* Bottom 10-pin header: JTAG port for programming/debugging

Done