| LEGO MINDSTORMS ROBOTICS PROJECTS |
LED-block
This 2X2 LEGO brick has a built in red and green
led. It is controlled from the motor ports of theRCX.
When the port is turned on, depending on the
polarity either the green or the red LED goes off.
led. It is controlled from the motor ports of theRCX.
When the port is turned on, depending on the
polarity either the green or the red LED goes off.
LEGO-ear: sound sensor for LEGO Mindstorms
The following project is a sound sensor that runs on the sensor port of the RCX. It uses the basic circuit described at
http://ourworld.compuserve.com/homepages/Michael_Gasperi/lego.htm by Michael Gasperi with some changes. I used a
common electrec microphone and added a pre-amplifier. The sensitivity can be adjusted with the 1K potentiometer. On a
highest setting a soft whisper can trigger the RCX. The circuit is built on a universal printed circuit board and embedded in clear
casting resin. The bottom of the cube is a 3X6 LEGO plate. The components can be obtained from the local Radio Shack.
http://ourworld.compuserve.com/homepages/Michael_Gasperi/lego.htm by Michael Gasperi with some changes. I used a
common electrec microphone and added a pre-amplifier. The sensitivity can be adjusted with the 1K potentiometer. On a
highest setting a soft whisper can trigger the RCX. The circuit is built on a universal printed circuit board and embedded in clear
casting resin. The bottom of the cube is a 3X6 LEGO plate. The components can be obtained from the local Radio Shack.
| Bottom view of the UPCB |
| Side view of the assembled "ear" |
| Top view with the microphone and potmeter |
| The casting mold |
| The casted circuit - side view |
| The casted circuit - top view |
| The circuit design |
| The UPCB layout |