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How do you use sensors inside functions 
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Joined: Sun Mar 04, 2007 3:02 am
Posts: 9
Post How do you use sensors inside functions
When I copy line following code to a function, it doesn't work, but when I put it in main, it works.

Do you have to do the motor and sensors wizard inside the functions.c file that I #include into the main program or do you need that code indivdually in each function?
Do I need to pass the address to the lightSensor variable to the function?

What do other people do? :?

Bill Herman

Sun Apr 01, 2007 9:05 pm

Joined: Fri Feb 09, 2007 9:21 am
Posts: 616
It's a little difficult to understand what you're requesting. Please post your "sample" code so that I can comment.

When you put the code in a function, are you calling this function within "main". If not, the function will not get executed and of course the code won't run.

You only need to do the motor / sensor setup once in your single main user file.

You could pass the 'lightSensor' index (i.e. S1, S2, S3 or S4) as a parameter to your function or you could define it as a global variable / constant known throughout your program including all the include files. The second method is recommended. And of course you should assign a meaningful name to it. If you do want to pass as a parameter then you will need at least RobotC version 1.04.

Tue Apr 03, 2007 8:53 am

Joined: Fri Mar 16, 2007 9:12 am
Posts: 26
Hi, I'm not sure if this is what you're looking for, but I declare these as globals before any tasks or main() in my main.c:

const tSensors sonarSensor          = (tSensors) S4; 
const tSensors lightSensor          = (tSensors) S3; 

and then, I put this inside of the start of each function where I'm going to use the sensor in question.



As an example..

You could also declare the first lines at the start of your function also but I believe you'll be unlikely to need to change them, so why not just put them in once..

Here's a task that uses the light sensor as an example of the sensor being used..
task edgeDet()
   if (SensorValue[lightSensor]<15)
   else EndTimeSlice();

Tue Apr 03, 2007 10:03 pm
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