PICNIC Hardware

PICNIC is a project to add 10BaseT Ethernet controller to PIC17F877, and it can run as an network-enable device.
This project is based on tristate's PICNIC product. And I just change the temperature sensor's circuits to improve the precision on A/D convert and add another Temp-Sensor channel.

Features:

• Build in Realtek RTL8019AS Ethernet Controller IC (10BaseT)
• MAC address are configurable via rewrite the 93C46 eeprom.
• Build in RS232 serial interface can connect to any host, and Transfer/Receive via network by UDP protocol
• LCD interface, can show IP address and any message by UDP protocol
• Drive the output port to I/O or H/L, could be used as an extension.
• Build in WWW server to show and change the configuration.
• A two channel tempture sensor.

Following is the main component used:

• Microchip PIC16F877 MCU IC
• RTL8019AS
• 93C46 EEPROM used to store MAC address and other ethernet settings
• MAX232 IC
• LM7805 IC(Only needed if you want to use the external power)
• a LCD

Schematic

The circuit are quite simple, you can click here and here to view the schematic in pdf format.
You can also also click here and here to download the design file in Protel99 format.

PCB Layout

Here is my PCB Layout in PDF:

• Top Layer
• Bottom Layer
• Silk Overlay

For your convenes, I also provide the PCB Layout in Protel99 SE format so that you can easily modify it to match your needs. 
Click here to download.