Arduino 644 and GSM900D how to control appliances through text?

Projects Programming
1

Hi! I am working with a Arduino 644 with GSM SIM900D module which will act as an SMS controller of appliances. The user will text ON/OFF and may inquire about the switching state of the appliance being controlled. My problems are:

  1. I don't know how to interface AT commands with Arduino.

  2. I'm not sure if the GSM module gets the text message being sent, because when I tried to text ON, there was no output in the serial monitor. I try the given examples in the net but still no luck.

  3. what are the connection of GSM Tx,Rx. into arduino 644?

  4. much appreciated if you give or post a link which is step by step procedures.

thanks in advanced and more power

Carlo_lsy

2
  1. I don't know how to interface AT commands with Arduino.

Then, this probably isn't the project for you.

  1. I'm not sure if the GSM module gets the text message being sent

Why not? Are you not reading the AT command responses?

  1. what are the connection of GSM Tx,Rx. into arduino 644?

What have you selected?