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Static int selectSwitch = 9 //The select switch for our encoder. Static int pinB = 3 // Our second hardware interrupt pin is digital pin 3 Static int pinA = 2 // Our first hardware interrupt pin is digital pin 2 Modified at EE to include the select switch *******Interrupt-based Rotary Encoder Sketch*******īy Simon Merrett, based on insight from Oleg Mazurov, Nick Gammon, rt, Steve Spence 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.I am trying to adapt the following code for Mega, as it was originally written for, and works well with, Uno: it interfaces with a KY-040 rotary encoder to simply increments/decrement a counter based on a clockwise/counterclockwise rotation of the rotary encoder. This pin on the Arduino board provides the voltage reference with which the microcontroller operates. A 3.3 volt supply generated by the on-board regulator. Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. 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 outputs a regulated 5V from the regulator on the board. You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). If using more than 12V, the voltage regulator may overheat and damage the board. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. The board can operate on an external supply of 6 to 20 volts. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. 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. You can also bypass the bootloader and program the microcontroller through the Cytron USB ICSP PIC Programmer header. The Arduino Mega2560 can be programmed with the free and open source Arduino IDE hrough a USB connection without needing any extra hardware thanks to its preburnt bootloader. For SPI communication, use the SPI library. The Arduino software includes a Wire library to simplify use of the I2C bus see the documentation on the Wiring website for details. Furthermore, it supports I2C (TWI) and SPI communication. An ATmega8U2 on the board channels one of these over USB and provides a virtual com port to software on the computer. The ATmega2560 provides four hardware UARTs for TTL (5V) serial communication. The Arduino Mega2560 has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. It also has 16 analog inputs, each of which provide 10 bits of resolution (i.e. Instead, it features the Atmega8U2 programmed as a USB-to-serial converter.Įach of the 54 digital pins on the Mega can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. The Mega2560 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. The Arduino Mega can be powered via the 1.5m USB Cable Type A to B or with an external power supply. The Arduino Mega is compatible with most shields designed for the Arduino Uno, 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 2560 Microcontroller Rev3 is a microcontroller board based on the ATmega2560.
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