Today Ill discuss an assembly that functions as an alarm and automation together, using the SIM800L. The modem is GPRS and needs a SIM card. We can say this is like a “cell phone,” but its very cool. Its extremely cheap and allows you to develop amazing projects. I’ll introduce you to the assembly and source code with ESP32, SIM800L, and a barrier sensor, in addition to making calls and sending alerts via SMS to smartphones.”

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