Saturday, June 21, 2008

NXT Whac-A-Mole

After blogging about the latest NXT competition, I decided that I might as well enter it. My entry? A NXT Whac-A-Mole! All of the details can be seen on NXTLog(

Here is a link to a YouTube video showing the NXT Whac-A-Mole in action!

The NXT Whac-A-Mole uses two NXT bricks and an assortment of motors and sensors to create an excellant entertaining and amusing game machine that the whole family can enjoy.


The score tower was made using the Catapillar tracks also from the Techic Bulldozer. When a point is scored, the tracks move, causing an attached score indicator to be raised or lowered.

When the score indicator reaches the top of the tower, an Ultrasonic Sensor tells the master NXT brick to lower the score indicator and begin a new, faster, harder game for the player.

The Light sensors and Hi-Technic Colour Sensor are used to help create an exciting atmosphere, and can easily be programmed to light up in a series of patterns when the player scores a point.

Using Bluetooth, the "Slave" NXT brick tells the "Master" brick whenever a mole is hit. The moles are made out of many engine chassis from such models as the Technic Bulldozer. When hit, the engine chassis pushes down onto a touch sensor, which tells a NXT brick to add a point to the player's score, raising a point indicator attached to a score tower.