![]() Why is the Vin pin not supplying 12V? Do I need to put an extraneous transistor in that as well? I don't see how limiting the current the Arduino supplies changes the voltage it's supposed to output. Why is the Arduino trying to fry itself by supplying more current to the device than it's supposed to? What kind of transistor are you telling me to buy - 12V 40 mA and 5 V mA? I am literally following setup guides that show this exact same wiring diagram and code. Modulating voltage should modulate the speed (and therefore volume of air) of the fan? The tiny fan I'm using has 3 pins, one of which is just a useless signal pin that just notifies a computer that it's working - the third pin (signal) on the fan is not connected to anything. It's not a 12V fan, it's a single 5V fan? This gives your projects plenty of room and opportunities maintaining the simplicity and effectiveness of the Arduino platform. If you got a computer fan with PWM speed control (the 4-pin ones) the extra pin is for PWM speed control, and you can put 12v across the fan and use 5v PWM on the PWM speed control pin, and then you don't need additional components. With 54 digital I/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects. If you used an N-channel MOSFET on the low side of the fan, and put the high side onto +12v, you could run the fan at a full 12v (I don't think all of those fans will even spin at 5v) You need to use a transistor to switch high current loads. Stop doing that before you burn out the pin driver. Oh yeah, there's no way you can power a 12v fan that typically uses that type of connector via an Arduino I/O pin, even with 5v, it would draw far too much current (which is what is happening, that's why the pin isn't able to provide a whole 5v). put your main code here, to run repeatedly:ĪnalogWrite(fan1Pin, 250) //Should be linear relation between 0-5V and 0-255 analog output.Ĭorrection: Vin is only supplying 4V when it's supposed to be supplying 12V. put your setup code here, to run once: This pin is PWM enabled for analog output 0-255 Sketch: const int fan1Pin = 5 //Output pin for the fan. It measures 3.23V for DC and square wave is just -000. I am placing it at the exposed yellow wire and the black wire at the base of the fan. If you use the pin as a digital input, you can enable the internal pull-up resistor for that pin. The digital section (page 67) shows the switchable pull ups. ![]() The Atmega 2560 datasheet ADC section (page 268) makes no mention of pull ups on the analog inputs. I'm using a multimeter set to measure DC voltage and the square wave. A pull up makes no sense on an analog input. ![]() Pin 5 (on the PWM side) is an output going to the red (+) terminal on the fan, black (-) terminal is hooked up to breadboard bar wired to the arduino's ground. There's a 12V power supply to the board in addition to USB. Need to see your wiring diagram - have you other stuff connected ? How are you measuring the voltage ? And your sketch - something is wrong but it’s not obviousĪttached picture of wiring setup. ![]()
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