arduino pwm zero mean modulation frequency

We can use a 555 Timer IC or even a comparator circuit to generate one. There are various ways to generate a PWM signal. An important thing to note here is that continuous switching of the fan will make it draw a large amount of current, so again, we discourage you from doing this in real life. Using this delay to our advantage, we can switch it on or off, making it faster or slower, to get the speed we want.

Switch it on again as it starts to slow down. Turn on the switch, wait until you see that the fan has achieved 50% of the speed, and turn off the switch. We know that the fan will not instantly achieve the max speed the moment we turn it on and neither will it immediately come to a halt as we turn it off. While we don’t recommend actually doing this, you can achieve it by playing a little with the switch of the ceiling fan. Is it possible without a speed regulator? Give this question a thought. Now, what if I ask you to run the fan at 50% of its max speed. So you can either turn it on and it’ll gradually achieve max speed, or you can turn it off. Imagine you have a ceiling fan in your home but without any speed regulator. We can generate a varied range of speeds (analog) for our motors and actuators even though in reality we are just switching between the two possible states of being on and off (digital). Keeping it “on” for a duration more than the “off” duration will raise the average power level and doing it the opposite way will reduce the average power level. You can rapidly switch the power supply on and off in a pattern to control the current delivered to the device. With electrical components, you can control the current delivered to them, even if the only control you have is switching the power supply on and off.

Arduino pwm zero mean modulation frequency