#TechToTinker There are actually a lot of GSM module available in the market but I personally recommends and prefers SIM800L due to its size and simplicity. It has a small footprint so it occupies a very small space. This is because SIM800L only provides the basic core of GSM. Meaning to say, you need to provide additional circuitry in order to use it. But don’t worry, I will show you the simplest way to use it, so stay tuned.
Links to the source code:
Links to another SIM800L tutorial:
https://youtu.be/xMsBFC10s1k How to make voice call
Links to use SIM800L DTMF capability:
Links to more detailed tutorials application / project:
OR you might interested in using ESP32 and a MicroPython instead:
Arduino Uno R3: https://invol.co/cl2ifv7
Arduino Uno orig: https://invol.co/cl2ifvw
Breadboard – https://invol.co/cl2d98p
Dupont jumper wires – https://invol.co/cl2d990
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source by TechToTinker