![]() ![]() ![]() You CAN't draw more than 100-150mA total from any pin, including the 5volt/3.3volt pins. The IOREF pin is there purely for switching between 5V and 3.3V on the IO pins. You CAN power a Mega from 12volt on the DC socket, but. Putting 12V into IOREF will make the Magic Smoke™ escape - unless there is some magic being done on the board that separates the pin drivers from the chip, and it would have to be so small that you can't see it. The reference voltage level should be changeable,Īlso for analog reference, that would be the AREF pin, maybe this page clears up a little about these two pins: I hope this helped, i sugest you look further into it before testing since im not 100% sure. ![]() Whenever u connect 12V to IOREF, the reference to HIGH will be 12V. This text is in the documentation : 'The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V" The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). This pin on the Arduino board provides the voltage reference with which the microcontroller operates. I never used it myself before, here's some info i found on arduino page of your board: although, you can change this value through the IOREF pin if im correct. The 980mA figure quoted is in total, over 49 pins. PeterBennett Yeah, the datasheet says the 20mA is per pin, and for an Arduino Uno. Therefor we bought a kit which included an Arduino Mega 2560 replica, a Ramps 1. The maximum output current on microcontrollers Ive used is around 20 mA, so your 980 mA is totally out of range - youll need transistors to handl that much current. The digital pins knows that 5v is equal to HIGH. Hi, we want to build a driving robot, which is powerd by 4 stepper motors (one for each wheel). 2 Step 2: Calculate how much current will flow. Connect the board to your computer using the USB cable. The Mega2560 automatically draw power from either the USB or an external power supply. The USB connection with the PC is necessary to program the board and not just to power it up. I think your awnser lies in the IOREF pin on your board. Connect your Mega2560 board with an A B USB cable sometimes this cable is called a USB printer cable. ![]()
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