The SIM800L is a great cellular phone module that integrates a GSM/GPRS module. It's only compatible with 2G networks. If you want to add voice, text, and SMS capabilities to your design, this hand - solderable module is an excellent choice. Series Protocol: UART. Product Features: It has a 3.5 mm phone audio jack. The MIC is disabled by default; you need to weld a 0 - ohm resistor at MIC - EN to enable it. Supply voltage ranges from 3.8V to 4.2V, with a recommended 4V. Power consumption is low in sleep and idle modes. The module is compact, measuring 25 x 23 mm. It uses UART and AT commands for interface and has a microSIM socket on the bottom side. It supports Quad Band frequencies and has an IPX antenna connector and a spring antenna on board. There's an LED for status signaling, and it can work in a wide temperature range from - 40 to + 85 °C. Kit includes 1x M5Stack SIM800L Module. Applications include nitrogen dioxide alarm, automatic web spider SMS - notifier, and remote meter reading system. PinMap: SIM800 Pin ESP32 Chip TXD U2RXD(GPIO16), RXD U2TXD(GPIO17), RST GPIO5.
Using this GSM SIM800L Module is quite straightforward. First, make sure to connect it to a power supply within the 3.8V - 4.2V range, with 4V being the best. Insert a microSIM card into the socket on the bottom side. If you want to use the MIC, weld a 0 - ohm resistor at MIC - EN. Connect the module to your device using the UART interface. You can then use AT commands to communicate with it. When it comes to the antenna, you can use the spring antenna on board or connect an external one via the IPX connector. For applications like the nitrogen dioxide alarm or remote meter reading system, follow the specific setup instructions for those projects. Remember to keep the module in a place where the temperature is between - 40 °C and + 85 °C. Avoid exposing it to extreme humidity or physical damage. To maintain it, just keep it clean and make sure the connections are secure. If you're not using it for a long time, store it in a dry place.
