I already have XBee USB Adapter and XBee SIP Adapter made by Parallax. How do I configure the XBee modules so that they can talk with each other?

I bought two Seeedstudio XBEE Shields at Radio Shack and I can't get the XBee radios to "talk" with each other using the code on http://www.seeedstudio.com/wiki/index.php?title=XBee®_Shield.  Using the terminal monitor that came with Arduino IDE 1.04, I type some words on first terminal window and garbage appear on second terminal window. I try to type words on second terminal window but nothing appear on first terminal window. When I run the X-CTU program and try to test/query the modems, I get messages saying that they can't be found. How should the two toggle switches be set? Is there a tutorial on using the shields?

I got confused by the photo of the Arduino Mega 2560 board with labeled pins. I think that the two pins at the top of the double header over pins 22 and 23 on the right side of the board are 5V pins. Are pins 23, 25, 27, and 29 digital pins? The labels on the photo confused me into thinking that pins 23, 25, 27, and 29 are 5V pins.

Try connecting 5VDC and GND between Arduino and shield.

I tried to download code for Seeed Studio Relay Shield V1.3 from Seeed Studio's website but the ZIP file is corrupted. How can I use the Relay Shield?

Are there DIY circuits for motor controllers/drivers that accept at least 10A?

What about http://www.pololu.com/catalog/product/1377 ?

I ordered 4 car seat motors from http://www.sciplus.com/p/12-VDC-2500-RPM-AUTOMOTIVE-SEAT-MOTOR_49249
Now, I need motor controllers for them. They draw 1.3A at no load and 9.5A when stalled. They run at 2500 RPM. Which one is best and cheap?

I am building a robot that is similar to the one in the image at http://www-robot.mes.titech.ac.jp/robot/walking/zerocarrier/zerocarrier_e.html
I need touch sensors with rollers or balls or wheels so that when the robot is rolling along the floor, the touch sensor's ball or roller or wheel is rolling along the floor. Any suggestions?

I ordered four motors at http://www.sciplus.com/p/12-VDC-2500-RPM-AUTOMOTIVE-SEAT-MOTOR_49249 for $9.50 each. The motors accept 1/8" square shafts that Vex Robotics Kit has.

I don't know how to take the 6V cordless screwdriver apart because there are no screws holding the orange body together. If I take the metal "U" shaped pin out, I see a two-stage planetary gearbox. I tried to search the Internet but I can't find anything about the Black & Decker AS6NG 6V cordless screwdriver. I found out that there is Black & Decker AD600 screwdriver with more torque. Both screwdrivers spin at 130 RPM. My Ryobi P200 cordless drill runs up to 1300 RPM and has 400 in.-lb. of torque. Any suggestions?

I think that the 6v cordless screwdriver is too slow for the sliding part of the robot. I tried a 18V cordless drill that I already have and it was fast enough but the drill is too big and too heavy.

I'm going to buy the 6V cordless screwdriver at K-Mart for $9.99.

I'm thinking of using drill motors with gearboxes for the sliding part of the robot. Harbor Freight has a 4.5V drill for $10 but I don't know what kind of DC motor the drill has. It may be a piece of junk.

http://www.harborfreight.com/48-volt-cordless-screwdriver-kit-68394.html

I tried a DC motor usually used in toys and it moved the sliding part fast enough. The size of the motor's can is 1-1/4 inches long and 1-1/8 inches in diameter. I built one of the four assemblies shown in the photo and I didn't build the chassis yet so I don't know how much the robot will weigh.