3. Check for TTL Output Pins in the module– You can feed the data from the gsm module directly to Arduino only if the module is enabled with TTL output pins. Otherwise, you have to convert the RS232 data to TTL using MAX232 IC and feed it to Arduino. Most of the gsm modules on ...
This sketch, for the Arduino GSM shield,sends an SMS message you enter in the serial monitor. Connect your Arduino with the GSM shield and SIM card, open the serial monitor, and wait for the "READY" message to appear in the monitor. Next, type a message to send and press "return". ...
Please note, using this one you cannot send a Unicode message. AT+CMGS="+1224XXXXXX" <ENTER> Test message from CodeProject Send and Receive SMS with IOT Device (Arduino and GSM Shield) <CTRL-Z> Here’s what we do for sending SMS, Send an “AT” command to check whether t...