Controlling Dc Fan With Arduino Electronics 360 Code explanation. this arduino code controls the speed of a dc motor using two buttons, up and down. the buttons are connected to digital pins 2 and 3 of the arduino board, respectively. the code applies an internal pull up resistor to both buttons to ensure that the pins are in a known state when the buttons are not pressed. Dc fan with arduino. connect the 5v spdt relay module to the arduino uno as follows: vcc pin to 5v. in1 pin to digital pin 2. gnd pin to gnd. connect the 12v dc fan to the relay module as follows: connect the positive terminal of the fan to the nc (normally closed) pin of the relay. connect the negative terminal of the fan to the gnd.
Controlling Dc Fan With Arduino Electronics 360 The l293d is a popular dual h bridge motor driver ic, commonly used to control the speed and direction of dc motors. it is designed to provide bidirectional drive currents up to 600ma per channel, with peak currents up to 1.2a. the ic contains two h bridge circuits, which means it can control two motors independently or one stepper motor. I am trying to control a 12v dc fan with pwm using an irfz44n mosfet. however somehow the fan is not turning on and off when the gate is pulled to either 0v or 5v (on the power supply). and it is definitively not working using the pwm pins on the arduino uno. next to that a 2 6 12v battery charger is used to power the fan. The 2n7000 n channel mosfet is enhancement type so we must set the arduino output pin high to provide power to the dc fan. the maximum current that a mosfet can source varies, but the one we are using can source 200ma. some mosfets can source up to 30 50a, and as a result, the size increases to be able to handle that amount of current. It should be possible to fix that in the code. use a transistor like 2n2222 to switch 12v to the fan from a pwm arduino pin. use a 270ohm resistor between arduino pin and the base of the transistor. the typical 4 wire 12 volt fan should look like this: so you just apply a pwm signal input to the pwm pin on the fan.
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