The mobile phones have built –in GSM module which enables them to connect with any cellular network around the globe. The GSM stands for Global System for Mobile communications. In certain applications the microcontroller based systems has to be connected with the GSM network which will enable a user to control the system by sending messages or making a call. The systems can also send messages to the user to alert or inform about the status of the system running. In all such cases a separate GSM module is used rather than using the mobile phones. There are GSM modules available which can do serial communication with microcontroller based systems. The communication is done by sending or receiving AT commands with the GSM module. This particular project demonstrates how to interface a GSM module and dial a call using the standard PS2 keyboard with the help of an Arduino board.
Phone Connector
Phone connectors are the most popular among the connectors and they are the oldest connector design still in use since its invention in 1870s. They are designed for low frequency analog signals especially foe audio signals. They are also known as audio jack, phone jack, phone plug and jack plug. They come in male and…