In addition to all the features of the previous board, the Mega 2560 now uses an ATmega8U2 instead of the FTDI chip. The Mega is compatible with most shields designed for the Arduino Duemilanove or Diecimila. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. The Arduino Mega is a microcontroller board based on the ATmega2560. The open-source IDE can be downloaded for free (currently for Mac OS X, Windows, and Linux). Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. This page is for reference only.Īrduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/ Wiring language. The new version has a few new pins and an ATMega16U2 instead of an 8U2. The Arduino Mega 2560 has been replaced by the Mega R3. 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.Replacement: DEV-11061. 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? 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. 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. I'm using a multimeter set to measure DC voltage and the square wave. 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |