USB Connector: The board has a USB Type B connector, which can be used for programming the board and for providing power to the board.ICSP Header: The ICSP header is intended for programming the board with an external programmer.Reset Button: The reset button can be used to restart the microcontroller or to put it into bootloader mode for uploading new sketches.The board also has a VIN pin, which is the input voltage to the board when it is powered by an external power supply. Power Pins: Arduino Mega 2560 Rev3 have several power pins, including 3.3V and 5V pins, which can be used to power other devices or sensors.Analog Input Pins: The board provides 16 analog input pins, which can be used for reading analog sensors, such as temperature sensors, light sensors, and potentiometers.15 of these pins can also be used as PWM outputs for controlling the brightness of LEDs or the speed of motors as an example. Digital I/O Pins: The board has 54 digital input/output pins, which can be used for a variety of purposes, such as reading sensors, controlling LEDs, and communicating with other devices.Dimensions: The board measures 101.52mm x 53.3mm. ![]() Here are a few of the most important components and connectors to be aware of: The Arduino Mega 2560 Rev3 is a large development board that is packed with a variety of components and features. Additionally, the board's large number of digital and analog input/output pins, as well as its support for multiple hardware serial ports, makes it well-suited for projects that require a high level of connectivity.Īrduino Mega 2560 Rev3 Pin Headers and Components The Arduino Mega 2560 Rev3 is compatible with most shields designed for the Arduino Duemilanove or Diecimila, making it a versatile option for expanding the capabilities of the board. ICSP header for programming with an external programmer.Power jack for an external power source.USB Type B connection for programming and power.54 digital input/output pins (of which 14 can be used as PWM outputs).It was first released in 2010 and has since become a popular choice among makers, hobbyists, students, and professionals in the fields of engineering, robotics, and electronics. Please note, not all PWM mode are available on all clocks.The Arduino Mega 2560 Rev3 is a microcontroller board based on the ATmega2560. Setting this to 400 results in a PWM frequency on the Arduino Mega pin of 16Mhz / 400 = 47304Hz, or possibly half that! The duty cycle is then changed by setting OCR4A or B to some value between 0 and 400įurther reading of the datasheet will explain all the registers, but hopefully this will point you in the right direction The actual frequency of the PWM is a function of these settings and the final entry, the input capture register. We have selected no prescaling, which corresponds to the native 16Mhz frequency of the Arduino clock. The CS bits relate to the clock selection, see table 17-6 in the datasheet. We have set it to mode 14, which is fast PWM with ICRn used as the maximum for the counter. The 4 statements relating to the WGM bits control the mode of operation of the PWM. Please note that the control registers 4, sections A & B will effect the PWM on all the OCR4n pins, see table above. Please see section 17.9 in the datasheet. These control the type, range and frequency of the PWM generated by the Arduino. We need to look at the timer counter control registers. This is extremely annoying as it produces a nasty noise when operating DC or stepper motors by PWM. One of the most annoying aspects of the native arduino PWM commands is that the PWM frequency is set to a value which is audible. How to change the frequency and range of the Arduino PWM? Now we can change the duty cycle using just the register Using the register is slightly faster.įirst we set the pin to output and use the analogWrite command to initialise the PWM Very simply we can use the register to set the duty cycle instead of the analogWrite command. How can we use this information on PWM registers? The following table gives the Arduino pin number and the corresponding register for controlling the duty cycle Arduino Pin Which Arduino Mega pins map to which registers in the ATMEL microcontroller? Normally you do this with the analogWrite() command, however, you can access the Atmel registers directly for finer control over the PWM on an Arduino including changing the type, range and frequency of the pulse width modulation PWM. ![]() The Arduino Mega 2560 has 15 pins which can be used for PWM output.
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