Freeduino CCM

Overview

The CCM is, in its simplest form, just an Arduino clone. However, given that the CCM is designed to be a generic sensor and actuator controller platform, there are slightly different requirements from the requirements that drove the Arduino. Some notable requirement differences:

• CCM will likely be installed for long periods of time vs. being continually updated
  • CCM can eliminate the USB / TTL serial bridge and rely on external USB / TTL serial adapters
• CCM will nearly always be addressed on an automation bus
  • CCM should have an electronic serial number
• CCM will have many, diverse power supplies
  • Power regulation can be moved off the CCM or provide a low current LDO footprint that can be populated as needed
• Many CCM applications will need to measure temperature in ranges suitable for 1-wire devices
  • Provide optional footprints for a 1-wire interface

Notes

Arduino Site
Arduino on a breadboard
ITP Physical Computing - Tons of microcontroller and Arduino reference information
Freeduino,:::::.org/" rel="external">freeduino - Tons of links to other Arduino material

Atmel.com Site

Samtec Samples - Make headers for the XBee also have the pass-through headers for stacking

DS2411 - $1.59@DigiKey; 48bit serial number 1-wire device for Zigbee implementations

Consider adding an SPI RTC to the base CCM:
SPI Real Time Clock / Calendar

Arduino Shields

XBee

Battery Module - Li+ with 3.3V/5V regulator and charger

RS-232/485/irDC Application Module

• Based on this serial to I2C chip SC16IS740 - $2.35 @ DigiKey

Ethernet I/O Module

• Good Example http://tuxgraphics.org/common/src2/article06061/eth-remote-device.pdf

Misc. Chips

• DS2482 - i2c to 1 or 8 bus 1-wire protocol converter and line driver
• DS1307 - Dallas RTC w/ I2C interface

Misc. Modules

These might be good to just socket on to a shield

• Ethernet mini board - $20 @ futurlec.com; SPI
• SD/MMC mini board - $7 @ futurlec.com; SPI

Connectors

Samtec ESQ - Try ESQ-108 w/ long pins for stack through shield nesting

Move to the XBee page

Rob Faludi's Blog - Excellent XBee resource
XBee firmware update - on a breadboard
Arduino Xbee Interface Circuit (AXIC)

Arduino Notes

My primary design goal was to keep my Freeduino cube I/O headers the same as the orignal Arduino. I also want to keep the mounting holes the same if that doesn't cause me heartache with my project boxes.

Changes between my layout and the original Arduino layouts:

• I wanted to use 8 pin headers everywhere so that I only need to purchase one type of socket. To accomplish this I added a hole between J2 (analog I/O) and the Power header and added 3 additional holes past the power connector. These additional pins provide a continuous 16 pin run and are connected to ground and Vin

Misc. Notes

Pierce-gate oscillator crystal load calculation