more switches day 6 computer programming through robotics cpst 410 summer 2009
TRANSCRIPT
More switchesDay 6
Computer Programming through Robotics
CPST 410
Summer 2009
7/1/09 Harry Howard, CPST 410, Tulane University 2
Course organization
Course home page (http://robolab.tulane.edu/CPST410/)
Lab (Newcomb 442) will be open for practice with 3-4 Macs, but you can bring your own laptop and all robots.
Stop it
Kelly §13
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The STOP block
The STOP block, in the Complete palette under the Flow icon, stops a program from continuing.It is a good way to break out of loops.
Tribot, beep until the Touch sensor is pressed.
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Stop.rbt
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The NXC analog
NXC has a constant ‘break’ that breaks a loop whenever it is encountered in a program.
How would you formulate the previous program for NXC?
First you need an endless loop.
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The endless loop
task main()
{
while (true)
{
// statements here
}
}
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Stop.nxc first version
task main(){
while (true){
PlayTone(440,500);Wait(500);if (Sensor(S1) ????){
break;}
}}
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Stop.nxc final version
task main(){
SetSensorMode(S1, SENSOR_MODE_PERCENT);while (true){
PlayTone(440,500);Wait(500);if (Sensor(S1) < 98) // unpressed = 100!{
break;}
}}
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Protect your robot
Tribot, move forward until the Touch sensor is released.
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TouchStop.rbt
Pick a card, any card
Kelly §12
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The RANDOM block
In the Complete palette under the Data icon.It generates a number between 0 and 100,
randomly.
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Display a random number
Tribot, display a random number between 20 and 80 every time the left NXT button is pressed and then beep, until the right button is pressed.
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DisplayRandom.rbt
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Random numbers in NXC
Random()Returns a single number chosen randomly
between 0 and 216 or 65,536.
Random(n)Returns a single number chosen randomly
between 0 and n-1.
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Display a random number in NXC
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More than two choices
SPOT, when I press the left NXT button, pick a number from 1 to 3. If the number is 1, display an image. If the number is 2, beep. If the number is 3, play a sound.
Drag out a SWITCH block and turn off Flat viewControl > ValueType > NumberConditions
1. > 12. > 2+ 3. > 3
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Switch3.rbt
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Next time
P2Multiple switches in NXC.Comparison: Kelly §15.The RANGE and LOGIC blocks: Kelly
§16-17.