A Github repository for SIM900a functionalities that include receiving and sending SMS and calls
| Commands | Purpose |
|---|---|
| AT | This command is used to initialize the modem and check if it's responding. It's typically sent to verify that the modem is connected and ready to accept further commands. |
| ATD+91xxxxxxxxxx | This command is indeed used to make a call to the number specified after ATD. +91 is the country code for India. Replace xxxxxxxxxx with the actual phone number you want to call |
| AT+CLIP=1 | This command enables the presentation of the caller's number in the incoming call. When a call comes in, you'll see the caller's number if this command is set to 1. |
| ATA | This command is used to answer an incoming call. When you receive a call and send ATA, it will pick up the call. |
| AT+CMGF=1 | This command sets the module in SMS text mode. After setting the module to this mode, you can send SMS text messages using the AT commands |
| AT+CMGS="[recipient_number]" | This command initiates the process of sending an SMS. Replace [recipient_number] with the phone number of the recipient. |
| Ctrl+z | This command is used to signify the end of the message when sending an SMS. In most cases, you actually send Ctrl+z or Ctrl+z followed by the Enter key (carriage return), depending on the terminal program or interface you're using. |
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The Following github repo was built with the help of this Video