Construction

A great set of links on http://www.arrickrobotics.com/mechpart.html
Metal parts to build structures from
http://www.hobbyengineering.com/SectionFR.html

Belts and sprockets http://www.hobbyengineering.com/H2028.html



from Tamiya......

 

 

They also have pulley sets

 

 

Great system at http://www.vexrobotics.com/vex-robotics-advanced-gear-kit.shtml

 

Motor control

Control of a basic motor using Parallax Motor MInd B http://www.parallax.com/

or the Secret Drive kit from Solarbotics that fits INSIDE a servo http://www.solarbotics.com/products/k_smd/

or the bigger version Kit #13 - L298 Compact Motor Driver Kit from Solarbotics 
http://www.solarbotics.com/products/k_cmd/ which usable from 6 to 50V, at up to 4A total output current

For stepper motors parallax has the Little Step-U Motor Controller at $70 it can save a lot of time and BS2 computing time

EasyDriver v3 Stepper Motor Driver for stepper motors at http://www.trossenrobotics.com/easydriver-v3-stepper-motor-driver.aspx

Pen size cameras and projectors

Look at http://www.aiptek.com/ for pensize cameras and projectors

Keeping updated

As the stock market fluctuates, a prime time to use the Dow Jones as a sensor input.

Breadboard Power Supply 5V/3.3V

A very simple breadboard power supply kit that takes power from a DC wall wart and outputs a selectable 5V or 3.3V regulated voltage. The .1" headers are mounted on the bottom of the PCB for simple insertion into a breadboard. Pins labeled VCC and GND plug directly into the power lines. The lone pair of pins have no electrical connection but help support the PCB.

MOSFET for solenoid drivers

After too long, MOSFETs come to the rescue.  Best way to control solenoids is using a logic power MOSFET.  Can handle up to 10A

rust never sleeps

Neil Young was right "rust never sleeps"