Subject:
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How2 'count' in NQC
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 2 Nov 2000 23:03:23 GMT
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Viewed:
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749 times
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In NQC you count by adding 1 to a variable like this:
int counter;
counter += 1
But it's hard to know *how much* you have counted; however, you can build a
little program to (say) flash a light when you reach a certain count.
I have spent about 4 hours discovering that a touch sensor can count many
times where you expect it to count *once*. So, does anyone out there know
how to count once only for each switch actuation, but in simpler form than
the following (which does work to count only once within a delay of 50 ticks.
//Bug6Leg4.nqc
//program to check results of a counter
#define BUMPER SENSOR_2
#define LAMP OUT_B
#define FLASH_TIME 10
#define DELAY 50
int counter;
void check_switch()
{
if (BUMPER == 1)
{
counter += 1;
Wait (DELAY); //to register 1 count only
}
}
void check_counter()
{
if (counter > 5) //light flashes after the 6th actuation
{
On (LAMP);
counter = 0;
Wait (FLASH_TIME);
Off (LAMP);
}
}
task main()
{
counter = 0;
SetSensor (BUMPER, SENSOR_TOUCH);
while (true)
{
check_counter();
check_switch();
}
}
Thanks in advance for your help.
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Message has 1 Reply:
 | | Re: How2 'count' in NQC
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| (...) The sensor returns 1 for as long as it's held down. In your code: (...) You are actually counting how long the switch is held down - in units of about a half second. So if you press and hold the switch for ten seconds, you'll get a count of (...) (24 years ago, 3-Nov-00, to lugnet.robotics)
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