Get Arduino Mega I2C Pinout Pictures. Pin21 (no label on the pcb front, only visible from the side). I have an arduino mega 2560 board, but not as connect my board to a circuit ds013 (real time clock), what are the pin i2c?

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Pin21 (no label on the pcb front, only visible from the side). , as shown in figures The arduino mega is a microcontroller board based on the atmega1280 (datasheet).

It has 54 digital input/output pins (of which 14 can be used as pwm outputs), 16 analog.

First of all, why arduino mega 2560? Connection between master and slave to send and receive data. It has 54 digital input/output pins (of which 14 can be used as pwm outputs), 16 analog. I have an arduino mega 2560 board, but not as connect my board to a circuit ds013 (real time clock), what are the pin i2c?