automatic control of AC light using labview/arduino

[inicuito]

this is my problem,

I'm trying to control the intensity of light in three bulbs using this circuit depending on my set point temperature lm35. for example:

I want that when the set point is 50 degrees and the temperature measured by the lm35 is 30 degrees this bulbs be up-to 100% when it reaches 40 degrees, the bulbs are at 50% and when 45 are at 25%.

can I control the pwm using labview formula node or other structure , I do not want to do manually with a slide. some advises?.

[hrh1818]

Because you are using an AC source for power for your lamps you can not use PWM.  PWM only works with DC power sources. Because your feedback signal is temperature the lowest cost control method for your application is to use On Off control and a relay.  Or if you are willing to invest more time and money you could use a phase control Triac circuit. See.

<http://playground.arduino.cc/Main/ACPhaseControl>

or  <http://arduinodiy.wordpress.com/2012/10/19/dimmer-arduino/>

You can use LIFA with On Off control.  You can not use LIFA with a Phase control Triac. 

hrh212

[inicuito]

all that without relay?

in that case i need investigate how to put labview as slave to display de temperature and signal. some advise?