I am using a GSM module sim800. My module responds to the output given by my PIR sensor and sends sms according to it. My module has got +5V, GND, Rx and Tx pins. What are the pin connections that I have to make?
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TX => RX, RX => TX, that is Arduino TX to module RX, and TX to module RX. If you want to use Serial the pins are 0 for Arduino RX, and 1 for Arduino TX. If you want to use SoftwareSerial you decide which pins to use (check the documentation for valid pins on your board). Cheers! |
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You have a choice. Always:
Then, either:
and use the hardware UART "Serial", but that then means that uploading new code to your Arduino becomes an arduous task since the usage pins 0 and 1 will interfere with that. So the other option:
And then use SoftwareSerial to set up a secondary "bit banged" serial port on the two pins you choose. |
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