Arduino mega 2560 pinout how to#
Arduino mega 2560 pinout Pc#

Look at the schematic for Arduino Mega and the ATMega2560 Datasheet The tan box in the pinout map below shows the pin name assigned by Atmel (who makes the chip). To toggle a given Arduino pin, you will need the x (port) and n (bit) to locate the registers and bits. “x” represents the numbering letter for the port, and “n” represents the bit number.įinding the registers for a given Arduino pin PUD in MCUCR disables all pull-up resistors if it is set to 1. PORTxn bit in PORTx register controls the output (high/low digitalWrite())

Three bits in three registers control the state of a GPIO pin:ĭDxn bit in DDRx register controls the direction (input/output pinMode())

Arduino mega 2560 pinout how to#

The I/O section from the ATMega2560 datasheet (linked below) explains how to configure and toggle a GPIO (General Purpose Input/Output) pin. 4 pinMode() and digitalWrite() under the hood.3.3 set the Arduino pin 13 as input (equivalent to pinMode(13,INPUT)).3.2 set the Arduino pin 13 as output (equivalent to pinMode(13,OUTPUT)).3.1 find the port and bit for Arduino pin 13.2 Finding the registers for a given Arduino pin.This is not recommended because you bypass the LD1117S50CTR 5V voltage regulator and have to make sure that the voltage level is stable. You can also power power the Arduino microcontroller from the 5V pin. You cannot power the board with the barrel jack and VIN GPIO at the same time, because there is a polarity protection diode, connecting between the positive of the barrel jack to the VIN pin, rated at 1A. Therefore you are able to power the Uno with an external 9 Volt battery. The voltage has to be between 7V and 12V. VIN Pin: If you use an external power supply like a battery, you can use the VIN pin.If you buy a DC power jack, make sure the power adapter of the plug supplies a voltage between 7V and 12V. DC Power Jack: It is possible to use the DC power Jack as power supply.The standard USB connection delivers 5V and allows you to draw 500mA in total.

USB cable: The most popular and also the easiest way to power the microcontroller is via USB cable.Like the Arduino Uno, you can power your Arduino Mega in three save ways because a voltage regulator provides a regulated and stable voltage for the ATmega2560 microprocessor: In my opinion you should be save to draw a current up to 100mA. The LP2985-33DBVR has a maximum output current of 150mA but on the official Arduino website, the maximum current is limited to 50mA. The maximum current draw from the USB connection is therefore reduced to 500mA.īecause the Arduino Mega has 3.3V pins to supply external electrical devices, there is a second voltage regulator build in, that reduces the voltage from 5V to 3.3V.

Arduino mega 2560 pinout Pc#

There is no need for a voltage regulator because the USB connection is already regulated by the USB output from your PC or laptop. The Arduino Mega can also be powered via the USB port. The maximum output current of the LD1117S50CTR is 800mA. Besides a higher input voltage than 12V has no advantage. But an input voltage between 7V and 12V is recommended to use the Arduino Mega over an extended period of time because otherwise the voltage regulator produces a lot of heat that can damage the microcontroller. The LD1117S50CTR provides a stable 5V output for the ATmega2560 and has a maximum input voltage of 15V.