10/31/2023 0 Comments Computer fan control![]() PWM is essentially an analogue output, where it can output a specific voltage between 0V and 5V (like 1.5V), instead of just 0V or 5V (On or Off). Connect the PWM pin to a transistor, and you can fully control the speed of the fan. To complete nickn4's post, the arduino can indeed control the fan speed with PWM. That way your arduino output is only require to trigger the motor, not to power it, and will then be strong enough. The reason you need transistors is because the third 'triggering' terminal requires a miniscule amount of current. With motors, this will allow you to control the motor's speed. if you send 50% of max voltage to the third terminal (the one that replaces a button), the lightbulb will be 50% bright. If you output a low voltage, the transistor will turn the lightbulb off.Īdditionally, transistors are sensitive to a variable voltage. If you output a high voltage to this terminal, then the transistor will turn the lightbulb on. Transistors have 3 terminals, two of them have the same function as the 2 terminals on electric switch, but the third terminal is replaces the physical button of a normal switch. Connect one terminal to the battery and one terminal a lightbulb, then if you flick the button up the lightbulb will turn on, and if you flick the button down, the lightbulb will turn off. ![]() Your typical switch has two terminals and physical button itself. ![]() Transistors can be thought of in this application as an electronic on-off switch. Here is a bit of an explanation in case you are not familiar with them: The arduino can indeed supply 5 volts, but it can only supply a miniscule amount of current from its output pins, which is typically not enough for DC motors, including your fan's motor (as mentioned by nickn4). With a typical brushed DC motor (dc motor with two wires), it requires a certain voltage and current to run. ![]()
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