Download the full pinout diagram as PDF here. The ATmega16U2 or 8U2 in the rev1 and rev2 boards firmware source code is available in the Arduino repository. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed. The power source is selected automatically.
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Download the full pinout diagram as PDF here. The ATmega16U2 or 8U2 in the rev1 and rev2 boards firmware source code is available in the Arduino repository. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed. The power source is selected automatically. The adapter can be connected by plugging a 2.
The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may become unstable. If using more than 12V, the voltage regulator may overheat and damage the board.
The recommended range is 7 to 12 volts. The power pins are as follows: Vin. You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. This pin outputs a regulated 5V from the regulator on the board. Supplying voltage via the 5V or 3. Maximum current draw is 50 mA. Ground pins. This pin on the board provides the voltage reference with which the microcontroller operates. 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.
They operate at 5 volts. Each pin can provide or receive 20 mA as recommended operating condition and has an internal pull-up resistor disconnected by default of k ohm. A maximum of 40mA is the value that must not be exceeded to avoid permanent damage to the microcontroller. External Interrupts: 2 interrupt 0 , 3 interrupt 1 , 18 interrupt 5 , 19 interrupt 4 , 20 interrupt 3 , and 21 interrupt 2.
These pins can be configured to trigger an interrupt on a low level, a rising or falling edge, or a change in level. PWM: 2 to 13 and 44 to LED: There is a built-in LED connected to digital pin The Mega has 16 analog inputs, each of which provide 10 bits of resolution i.
There are a couple of other pins on the board: AREF. Reference voltage for the analog inputs. Used with analogReference.
Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board. Communication The Mega board has a number of facilities for communicating with a computer, another board, or other microcontrollers. An ATmega16U2 ATmega 8U2 on the revision 1 and revision 2 boards on the board channels one of these over USB and provides a virtual com port to software on the computer Windows machines will need a.
The Arduino Software IDE includes a serial monitor which allows simple textual data to be sent to and from the board. Three screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is mil 0. The Mega is designed to be compatible with most shields designed for the Uno and the older Diecimila or Duemilanove Arduino boards.
Furthermore, the main UART serial port is located on the same pins 0 and 1 , as are external interrupts 0 and 1 pins 2 and 3 respectively. Automatic Software Reset Rather then requiring a physical press of the reset button before an upload, the Mega is designed in a way that allows it to be reset by software running on a connected computer. When this line is asserted taken low , the reset line drops long enough to reset the chip. The Arduino Software IDE uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment.
This means that the bootloader can have a shorter timeout, as the lowering of DTR can be well-coordinated with the start of the upload. This setup has other implications. For the following half-second or so, the bootloader is running on the ATMega While it is programmed to ignore malformed data i. If a sketch running on the board receives one-time configuration or other data when it first starts, make sure that the software with which it communicates waits a second after opening the connection and before sending this data.
The Mega board contains a trace that can be cut to disable the auto-reset. The pads on either side of the trace can be soldered together to re-enable it. Revision 3 of the Arduino board and the current Genuino Mega have the following improved features: 1. The second one is a not connected pin, that is reserved for future purposes. Atmega 16U2 replace the 8U2. Related Products.
The Arduino Web Editor is hosted online, therefore it will always be up-to-date with the latest features and support for all boards. Follow this simple guide to start coding on the browser and upload your sketches onto your board. The Mega automatically draw power from either the USB or an external power supply. Connect the board to your computer using the USB cable. You have a Mega, therefore it has an ATmega microcontroller, selected by default as processor. Select the serial device of the board from the Tools Serial Port menu.
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