How can I do a loop-back test between Arduino UNO with Bluetooth module and a PC running a terminal program? For example, I type "A" and I should get "A". Which terminal program should I get? I tried to type $$$ and nothing happened.

John, I finally got it working! I found out that I had to disconnect the yellow wire from the Arduino UNO before uploading the code to it and run Serial Monitor, then connect the yellow wire to the Arduino Uno.

There appear to be a conflict between the Bluetooth module and Software Serial. The Arduino UNO uses COM3 and the Bluetooth module uses COM5. Any suggestions?

There's a tutorial at http://arduino.cc/playground/Tutorials/GPS and the GPS module have four wires connected to the Arduino UNO. Two wires from the GPS module are connected to Gnd on Arduino UNO. There appear to be a conflict between GPS module and Software Serial. The Serial Monitor is stuck at "Receiving GPS". Any suggestions?

How can I use hardware serial instead of software serial?

I still have problems getting Parallax PMB-648 GPS module to work with Arduino UNO. If I try to upload code to Arduino UNO while the GPS module is connected to it, I get messages related to COM ports in use. If I try to compile code that uses TinyGPS library, I get messages saying that TinyGPS and gps are not declared. How can I fix the problems?

I followed the tutorial at http://learn.parallax.com/kickstart/28500 but the Serial Monitor displayed "Reading GPS" and won't display the coordinates.

How can I get Bluetooth module working with Arduino UNO?

https://www.sparkfun.com/products/10269

How can I get Parallax PMB-648 GPS module to work with Arduino UNO? The GPS module works fine with Basic Stamp 2.

Suggestions for accelerometers, gyroscopes, and GPS receivers? I would like to build a model car that is self-driving, much like the car in Knight Rider TV show.

I built a biped robot but I found out that the servos that came with the EZ-Robot kit are not strong enough. The hip servos can't lift the legs up. Any suggestions for stronger servos?

I have the Seeed motor shield. There is no way of connecting anything but motors and sensors to it. I have the Maker Shield and I can't plug it on top of the seeed motor shield. If I plug the motor shield on top of the Maker Shield, how can I connect wires to the black headers?

It took me a few hours to make one "C" servo bracket from wood and plastic. I had to make adjustments to the "C" bracket so that it rotates without any problems. I have a CNC router but I'm afaid to cut non-wood materials on it.

Do all servos have to be from one company? Can I use servos from two or more companies? Why servo horns made for one brand don't fit servos made by another company?

How can I make servo brackets like those on LynxMotion Robots out of wood and plastic? I want to try to make a small biped robot.