Contents
What is PWM dimmable?
Pulse-width modulation (PWM) is a common type of dimming used to adjust the current in white-LED driver devices. PWM dimming takes a rectangle waveform with variable positive duty cycle (D) and adjusts the LED current proportionally.
How PWM dimming works?
PWM Dimming PWM works by using the exact amount of electrical current the LED requires. The process quickly switches between that current amount and zero. So either the LED is running on its necessary amount of power, or it’s off. A benefit of PWM dimming is that is allows the LED to be on for less time.
What does PWM do to a LED light?
By using PWM, it provides the ability to ‘simulate’ varying levels of power by oscillating the output from the microcontroller. So basically, if, over a short duration of time, we turn the LED on for 50% and off for 50%, the LED will appear half as bright since the total light output over the time duration is only half as much as 100% on.
What kind of dimmer do I need for LEDs?
These problems make it so some users might want to look below at electronic potentiometers or 0-10V Dimmers. 100K Potentiometers are great for smaller projects where you just need a turn style knob for control, or they are great if you are simply testing the dimming range or output of LED lights.
What should the light output be without a dimmer?
When the wires are left untouched (without a dimmer) the signal is at 10V, thus 100% light output. The same is to be said if you have a dimmer connected and turned up all the way.
How can i Dim my led with Arduino?
The control in this type of dimming will have wires or terminals which will connect into the driver dimming wires. As the duty cycle is reduced the LED controller will lower the output of the LED driver. A good example of this would be using an Arduino to output a PWM signal to the dimming wires.