Adding TCP/IP Ethernet to PIC - how?

[dhouston]

I just purchased one of the http://www.connectone.com/products.asp?did=73&pid=93
37.00 not bad thanks for the tip been looking for one to play with

I probably should note a couple of gotchas.

1. The spacing of the headers is not 0.100" but 2mm (0.079") so you cannot use the $37 model in a breadboard.

2. These are 3.3V devices and the pins are not 5V tolerant. If you connect to 5V PIC input pins that have Schmitt Trigger buffers, you will need level shifters capable of handling both high and low logic levels which probably means a transistor or mosfet. 5V outputs from a PIC to the device's 3.3V inputs will also require level shifting. Here's a chart showing various logic levels.

• http://www.interfacebus.com/voltage_threshold.html

SparkFun has an inexpensive 4-channel level converter.

• http://www.sparkfun.com/commerce/pro...oducts_id=8745

You can, however, solder leads to the $38 model for testing. The pinout is given in the documentation for their evaluation board.