Arduino to Sim900 wiring -


i need help. newbie in here want create communication between arduino , sim900 gsm/gprs module, still confuse wiring

there 2 type wirings in sim900 arduino, hardware serial wiring , software serial wiring. 1 have use ? hardware serial wiring or software serial wiring

thanks

i think sim900 has i2c interface. if using arudino-uno, hardware serial port used communicate pc, therefore, use i2c interface. see "wire" https://www.arduino.cc/en/reference/wire library examples.


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