Introduction to Programming
RIS 2.0 RCX Code
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Starting the RCX Programming
Environment
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Double Click on the RCX icon
Once the program is loaded, create a new
user, or select an existing one
Click on “Program”
Click on “Freestyle”
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Starting the RCX Programming
Environment
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Mission 1: Drive Forward (with
Timer)
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Go Forward for 5 seconds
Stop
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Saving your work
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Go to File
Click on Save
Type in File Name. i.e. “First Mission”
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Downloading and Running
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5 different programs can be loaded onto the
RCX at once
Select which slot you want to use by clicking on
“Settings” and selecting one of the 5 slots
Make sure that the robot’s IR port is facing
towards the IR tower, and click “Download”
When the download is finished, you will hear a
beep
You can now run the program by pressing the
grey “Prgm” button on the RCX to select the slot
you programmed
And press the green robofest
“Run”
2005button
Driving in Reverse
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Use the “Set Direction” block under
“Small Blocks”
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After changing the directions, turn on the motors
for 3 seconds
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Turning
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Set the direction of one motor to “Forward” and the
direction of the other motor to “Back”
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Repeat For
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Play a beep 3 times
Uses the “Repeat For” block.
“Repeat For” specifies the number of
times a certain action is to be performed.
i.e. Repeat Beep For 3 Times
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Repeat For
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Light Sensor
• Mounted to the front of the robot, facing the
ground
• Allows detection of lines, white or black, as well as
detecting lamps, lasers, and other light sources
• Use the “View” button on the robot to view the
light sensor value over the black line. Remember
or write down this value.
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Using the light sensor
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Select “Wait Until” from the “Wait” column
Select “Light” and click “Next”
Select Input Port # to which the light
sensor is connected. Press “Next”.
Select “Bright” if looking for white line,
“Dark” if looking for black line. Press
“Next”.
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Click on “Manual” and enter a value for the line. Usually it’s
the value from using the “View” button – 5 for a white line, or
the value from using the “View” button + 5 for a black line
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Mission 2: Detect Edge
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When the light sensor detects an edge,
beep three times
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Mission 3: Detect Light and Beep
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When the light sensor detects a bright
light source, beep
Repeat forever
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Mission 4: Drive Forward and Stop
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Go forward until the edge of the
board/table
Stop
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Mission 4 Solution
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Touch Sensor
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Touch sensor is attached to
the bumper
When the bumper is
pressed the touch sensor is
activated
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Using the Touch Sensor
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Turn on the motors
Select the “Wait Until” block from the
“Wait” column or “Repeat Until” from
the ”Repeat” column
Make sure “Touch” is selected and press
“Next”
Choose Input Port # to which the touch
sensor is connected, and press “Next”
Make sure “Press” is selected, which
will allow the robot to react when the
touch sensor is pressed. Press “Next”
again.
Press “Done”
Turn off the motors
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Mission 5: Touch Sensor
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If the touch sensor is pressed once, turn on the
left motor
If the touch sensor is pressed twice, turn off the
left motor, and turn on the right motor
If the touch sensor is pressed three times, turn
on both motors
If the touch sensor is pressed four times turn
both motors off
Repeat Forever
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Mission 6: Yes or No Statements
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If the Light Sensor is detecting the edge
then play Beep #1
Otherwise play Beep #2
Repeat Forever
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Mission 7: Right-Handed Line Follow
with Touch Sensor
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If light sensor sees black - turn right,
otherwise – turn left
Repeat the process until the bumper is hit
Stop
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Mission 7: Right-Handed Line Follow with
Touch Sensor
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Mission 8: Line Follow and Stop
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Follow the black line, until robot reaches
edge of the board
Stop
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Mission 8: Line Follow and Stop
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Mission 9: Left-Handed Line Follow
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If light sensor sees black - turn left,
otherwise – turn right
Repeat the process until the bumper is hit
Stop
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Mission 9: Left-Handed Line Follow
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Mission 10: Sensor Stacking
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Stack touch sensor on
top of light sensor
Follow the line, when
touch sensor is
activated stop.
When the stacked touch sensor is pressed the value on
Port 2 will read 100. When the touch sensor is not
pressed the value for the light sensor will be read.
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Mission 10: Sensor Stacking
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Sensor Stacking With Tasks
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Mission 11: Line Counter with
Variables
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Go forward
Count each line as the robot crosses it
When the robot crosses the 3rd line, stop.
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Uses variables to count number of lines
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Mission 11: Line Counter with
Variables
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Mission 12: Proximity Sensor
(simple method*)
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Use the IR Transmitter and Light sensor to
create a Proximity Sensor
Constantly generate IR messages, and use
the Light Sensor to detect the reflected IR
beam
(*) There is another better method to check fluctuations of the light intensity
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Mission 13: IR Communications
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One RCX is sending a message, the other
is receiving it
Confirm that the message has been
received by beeping
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Transmitter Solution
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Receiver Solution
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This PowerPoint will be posted online at
http://www.robofest.net/resources.htm
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