Fuzzy control using Labview and arduino

Dear all,
I have been trying to control the output of an LED using a fuzzy logic controller, based on temperature and humidity values that I receive from the DHT22 sensor via arduino in the LABVIEW setup, but the problem is, I am not sure how to set up the PWM pin of arduino for that purpose. I have used an arrangement for the setup but it has not given any LED signal so far. The VI is attached herewith. PS- I have connected the LED to pin 6 (PWM pin) of the arduino UNO board.
As far as the data acquisition part is concerned, the setup is working fine and I am being able to get the values of temp, humidity and light intensity.
Any help in this regard would be highly appreciated.
Attachments:
temhumlightctrl1.vi ‏48 KB

Just start with a simple VI commanding a PWM, and put a meter or a scope to see if the output changes. If you can't get any output there is likley a problem with your setup. If you are driving more than an LED you'll need some kind of buffer circuit or opamp to increase the current capabilities. These micros can't drive much power so if you intend on using this PWM for controlling temperature and humidity you won't be able to drive it directly.
Also be aware that your loop time is going to be relativly slow, and not deterministic. Most control systems like PIDs need to have tight timing to ensure that the system stays stable while having a decent response time. Since temperature and humidity change pretty slowly this will likely work just fine. But know that the time it takes to send a command to the Arduino, have it go out, take a sample and then send it back over serial won't be consistent.
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selft test.jpg ‏1615 KB

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