![]() Some YouTube videos power their modules from the Arduino UNO's power pins which really doesn't work for me. However, its TX and RX pins are 5V tolerant. This means you must not connect its pins directly to a 5 V Arduino! It doesn't even run on 3.3 V. ![]() This board draws a maximum of 2 A with an input voltage of 3.7 V to 4.2 V. Power requirements is probably the most common issue with the SIM800L. Go to SIM900 Tutorial if you have that module instead Powering the Board
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