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It also has auto baud rate detection for ease of use. Other than that all the usable pins are broken out to a 0.1” pin pitch that makes this module very breadboard friendly. As mentioned in the above pinout section, the operating voltage of this device is 3.4V to 4.4V which means you can power this module directly from a lithium polymer battery. Overview of the SIM800L GSM/GPRS ModuleĪt the heart of the breakout board, there is the SIM800L GSM/GPRS Module made by SimCom. This means you just need to insert a SIM card and push it for the card to work. On the backside of the board we have the sim holder that is a push-to-lock type connector. Finally, we have a big 100uF,16V tantalum capacitor on board. We also have some capacitors for decoupling and we have a 1K current limiting resistor for the LED. On the front side of the PCB, we have the UFL connector and the SIM800L module itself. If you take a closer look at the SIM800L module there is not much on the PCB. The parts marking of the module is shown below. The SIM800L module is a compact, versatile, and easy-to-use module for GSM and GPRS. SPK+- these two pins can be used to connect an external speaker to the module. MIC+- These two pins can be used to connect an external microphone to the module. Pulling the pin high puts the module in sleep mode and disables the serial. It will go low for 120ms to indicate incoming calls and can also be configured to pulse when an SMS is received.ĭTR this pin can be used to put the module in sleep mode. RING is the ring indicator pin of the module. GND is the Ground pin for this module connect this pin to the Ground pin of the ESP32. #Serial communication with gsm modem sim 800 serial#TXD is the TX pin for this module used in Serial communication. RXD is the RX pin for the module used in serial communication. If you are having trouble communicating with this, pull the pin low for 100ms. RST is the hard reset pin of the sim800L module. A lithium battery or a buck converter with 2A current capacity is recommended for this module. Connecting this module to a 5V supply will most likely destroy it and if you connect it to 3.3V it won't even run. VCC is the Power supply pin of the module and it needs to be powered anywhere from 3.4V to 4.4 volts. NET is a pin where you can solder the helical antenna that comes with the module. The SIM800L GSM/GPRS module has 12 pins which are NET, VCC, RST, RXD, TXD, GND, SPK-, SPK+, MIC-, MIC+, DTR, RING. This module can do anything that a normal cell phone can do like text message, make and receive phone calls and connect to the internet through GPRS and on top of that, it supports quad-band GSM/GPRS means it can work anywhere in the world. SIM800L is a very compact GSM/GPRS module that can be integrated into a lot of IoT projects due to its compact size and flexibility. In this type of situation, SIM800L GSM/GPRS Module can come in very handy. Whether you want to get notified when someone enters your room or you want to water your plants from miles away, the internet is always a problem. #Serial communication with gsm modem sim 800 how to#Let's say you are trying to build a remote IoT data monitoring system, the first problem you will face is how to get a proper internet connection for your device.
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