![]() Next, connect the antenna to the mini socket located in the upper left area of the module. There are several ways to do this but the easiest is to use a simple resistor divider (1.69k for the top resistor, and 3.3k for the bottom resistor is a good choice). This means the TX signal (D7) coming from the Arduino Uno must be stepped down to 3.3V so as not to damage the SIM800. Note that the Arduino Uno uses 5V GPIO whereas the SIM800 uses 3.3V level logic and is not 5V tolerant. Keep in mind that the send pin on the SIM800 connects to the receive pin on the Arduino, and the receive pin on the SIM800 connects to the send pin on the Arduino. These are the serial UART connections which allow communication between the two modules. ![]() Then, connect the SIM800 TX and RX to the Arduino D8 and D7 respectively. Now, insert the microSIM card into the back of the SIM800 module. 3.7V Lithium Polymer Battery (Supply for SIM800L).You need to have the following hardware components and installed software on your PC as listed below.įigure 1: SIM800 and Arduino UNO basic connections. This includes ground plus UART send and receive lines. All you need is three lines between the SIM800 and the Arduino. The connections for a basic serial communication setup between an Arduino and the SIM800 are quite simple. Programming & Prototyping Basic Connections ![]() WARNING: The SIM800 is an older GSM cellular module, and unfortunately most regions of the world are actively phasing out GSM cellular networks, so it is not recommended for new designs. Nonetheless the SIM800 is a great general purpose cellular module.
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