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Just ADDR Pin
Because the I2C pin of Mega 2560 is different from Uno.To work with Mega 2560 Board, You must connect :ADDR pin > pin 17 (Mega RX2 pin)SDA pin > pin 20 (Mega SDA pin)SCL pin > pin 21 (Mega SCL pin)Or you can change the pin on the library.
Hi, Can it measure the oxygen in the air like in the room???I want to buid it to measure the oxygen in the factory...