Use PWM to control led brightness with a led driver

Hello guys,

 

my netduino is working great, but I have some trouble to get this led driver (CCS2-700) working: http://www.anvilex.d.../DS_P011_36.pdf (sorry, didn't found a german description, but I know that a ZXLD1366 is used.

 

Its a led driver that supports DIM with PWM.

 

So, I connected 12v on V+, GND to GND and my led stripe is on. ok, next my netduino... pwm pin9 to DIM and GND on netduino to GND on the led driver. after some coding, nothing happens :-(

PWM ledpwm = new PWM(PWMChannels.PWM_PIN_D9, 400, 1, PWM.ScaleFactor.Microseconds, false);
            
            uint i = 1;
            ledpwm.Start();
            // write your code here
            while (true)
            {
                ledpwm.Duration = 1;

                Thread.Sleep(3000);

                ledpwm.Duration = 100;

                Thread.Sleep(3000);

                ledpwm.Duration = 150;

                Thread.Sleep(3000);

                i++;

                if (i == 5)
                    break;
            }

            ledpwm.DutyCycle = 0;

Can you tell me what's wrong?

 

 

 

Hi Taxi4110,

If you plug an LED directly into pin D9 and GND, does it illuminate at the brightness levels you're expecting?

Also, what happens if you set the Duration to 400 (to match your period of 400us) and 0 (for off)? And what happens if you use an OutputPort instead and just turn it on and off (effectively 100% and 0% duty cycles)?

Welcome to the Netduino community,

Chris

Hi Chris,

 

thanks for your reply. A LED direct on pin D9 is working like expected. I'll test tomorrow again with the led driver and then show you the result. Thank you!