Contents
What is SIM800L GSM module?
SIM800L GSM/GPRS module is a miniature GSM modem, which can be integrated into a great number of IoT projects. You can use this module to accomplish almost anything a normal cell phone can; SMS text messages, make or receive phone calls, connecting to the internet through GPRS, TCP/IP, and more!
What are the commands used in GSM?
AT commands with a GSM/GPRS MODEM or mobile phone can be used to access following information and services: 1….AT Commands, GSM AT command set.
| Command | Description |
|---|---|
| AT+CMGS | Send message |
| AT+CMSS | Send message from storage |
| AT+CMGW | Write message to memory |
| AT+CMGD | Delete message |
What is at in AT commands?
AT commands are instructions used to control a modem. AT is the abbreviation of ATtention. Every command line starts with “AT” or “at”. That’s why modem commands are called AT commands. The starting “AT” is the prefix that informs the modem about the start of a command line.
Why is sim800 module not working on Arduino?
Dont try to get a fast baudrate as software serial doesnt work, try with 9600 to start then see if it response to the AT command. SIM800 is a very simple module, try with an FTDI in case you want to make sure you didnt break your Arduino.
What’s the Undervoltage warning on the sim808?
Note that the SIM808 will alert you with an “undervoltage warning” sometimes as a response to AT commands. I bet the SIM800 would do the same. As Max above is alluding to – try powering the SIM800L via a separate 5V 2A adapter.
Why is my Arduino not responding to commands?
I plug the arduino to the laptop so arduino turns on. Then open the serial monitor (not flashing the arduino). And then click on the reset button on the board. Here is a screenshot of the serial monitor. And bellow the new code I used.