The module recognizes AT commands, which can be used to do things like check signal strength, get the SIM card number, check the network connection and battery state, in addition to reading texts, making and receiving calls. The SIM800L can be connected to a microcontroller using the serial UART interface, and in the example shown below, connected to an Arduino. It can also connect to the internet and receive FM signals. It can send and receive text messages and receive phone calls. The SIM800L is a GSM module with a serial interface. Note: Complete technical details can be found in the SIM800L datasheet given at the end of this page. Two microphone inputs and speaker output.Serial data terminal ready pin, pull high to enable sleep mode Reset pin, pull low for 100ms to perform hard reset Another advantage is that the board makes use of existing mobile frequencies, which means it can be used anywhere in the world. The SIM800L is a GSM module from Simcom that gives any microcontroller GSM functionality, meaning it can connect to the mobile network to receive calls and send and receive text messages, and also connect to the internet using GPRS, TCP, or IP.
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