EducateNXT

Bluetooth Remote ControlUsing Bluetooth and the Rotation sensors in NXT motors, it is possible to create a remote-controlled robot using two NXT bricks.

This PowerPoint shows how to make a simple remote control, but there are ample opportunities for extension.

EducateNXT

Making a Remote ControlThe simplest remote control is made by attaching “paddles” to the NXT motors.

An example is shown below.

EducateNXT

Programming Steps• When a paddle on the Remote Control (RC) is

pushed forward, the Rotation sensor inside the NXT motor is read and passed by Bluetooth to the EduBot brick.

• The above step is done for both paddles and placed in an indefinite loop.

• Upon receiving the Rotation sensor readings, the EduBot program wires these values into the Power input on a respective Move block for each wheel.

• The EduBot program is also placed in an indefinite loop so Bluetooth messages can be continually received from the paddle remote control.

EducateNXT

Programming the RCFirst step is to Zero the Rotation sensors

“Place paddles in an upright starting position – then press the orange

button to begin.”

The following text can be displayed on the NXT Screen:

Note: You need a new Display block for each line of text – and deselect the clear check box for every

display icon except the first.

Reset the

Rotation Sensors on the

Paddles.

Wait forPress of

the OrangeButton.

EducateNXT

Programming the Remote Control

Now for recording

Paddle position and sending.

1. Read the value for the B Rotation sensor.2. Pass this message to the Btooth block for sending (via Mailbox 1).3. Read the value for the C Rotation sensor.4. Pass this message to the Btooth block for sending (via Mailbox 2).5. Put all the above in an indefinite loop.

Add to previous blocks

EducateNXT

Programming the EduBot

1. Receive the Bluetooth value for Mailbox 1.2. Wire this into a Motor B block. 3. Receive the Bluetooth value for Mailbox 2.4. Wire this into a Motor C block. 5. Put all the above in an indefinite loop.

Start a new program:

EducateNXT

Download ProgramsDownload the two programs to the Remote Control and

Edubot respectively.

Ensure the EduBots have established a Bluetooth connection.

For more on how to do this go to

EducateNXT

Establishing a Bluetooth Connection PowerPoint

The world is now your remote oyster!

EducateNXT