MCU'sAtmelNOTE: the iRobot Create platform uses an ATmega168 chip which only has 16K of programming space but same amount of I/O pins as the ATmega328.
ATmega32832K of program space. 23 I/O lines, 6 of which are channels for the 10-bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. 1.8V to 5V operating voltage!
64KB Flash, 4KB EEPROM, 8KB SRAM, 58 I/O Total
GumStix
These are a full computer on a board the size of a pack of gum. They are either 400 Mz or 600 Mz, run linux, and use an SD card instead of a hard drive. They have a full line of add on boards to do things like motor control, video capture, and wireless communication. Details here Motor DriversSabertooth dual 5A motor driverDrives 2 brushless motors. Need more than one for multiple motors.
Servos
WirelessXBeeWireless UART from point-to-point.
The original XBee 1mW has limited range but easier to set up.
The XBee 2mW Series 2.5 is more configurable (can create mesh network) but is harder to set up. Cell Phones Integration
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