![]() ![]() The power source is selected automatically.Įxternal (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The Arduino Mega can be powered via the USB connection or with an external power supply. Pin Mapping: PinMap2560 page Summary Microcontroller Schematic: arduino-mega2560-schematic.pdf Schematic, Reference Design & Pin MappingĮAGLE files: arduino-mega2560-reference-design.zip The Mega 2560 is an update to the Arduino Mega, which it replaces. 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. But i'll remember the info for the future.The Arduino Mega 2560 is a microcontroller board based on the ATmega2560 ( datasheet). Tho i will be installing a mini heatsink on the regulator to dissipate any extra heat as a precaution since this will be in my garage/shop and the ambient temps can get up there in summer and may have to make some extra cooling modifications. The only thing the on-board regulator is powering is the microprocessor for my digital output but there is nothing else drawing a current from the board, so i believe i'll be fine in this case. I've read about the weak regulator before I started which is why i decided to use a separate 5v for all the peripherals, and used an isolated power supply to feed the board. The arduino is very limited on power output and the regulator will overheat if it's overloaded. Thanks for the info and i understand what your saying. If you do not have 5 V, then you provide a switchmode regulator to produce regulated 5 V. You can fudge it by connecting something such as a USB charger to the USB connector but there is a 500 mA polyfuse on the UNO/ Mega and a diode on the Nano interposed. If you have 5 V then you provide it to the "5V" terminal. The microprocessor and its peripherals operate from 5 V. Even if it works at a start, any modification may later cause trouble. It is thus extremely bad design to use "Vin" in a serious project. You will not get 1 A at 5 V from the board with any "Vin" voltage for more than a second or two before the regulator overheats - and hopefully shuts down peacefully. You can barely see it on the Arduino board. ![]() It may theoretically have a rating of 1 A, but only when bonded to a substantial heatsink. The on-board regulator - unless you use a variant such as the "RoboRed" (it has a proper switchmode regulator) - has no heatsink of significance. Once you start connecting things that draw current, and that includes connecting things to draw current from the "5V" pin, you are playing with fire - or not! This is even worse for the Mega as it has more pins to connect things to! The "Vin" pin or in fact the "barrel jack" which is the same with a diode, was provided to demonstrate the Arduino. So what kind of trouble am i asking for by powering it by the Vin pin? I thought the Vin pin was meant for a hardwired setup or battery power without using the USB or barrel jack for the power input, because the specs say it needs to be between 7-12v with 9v being best. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |