![]() ![]() their Arduino's have internal regulators that drop the voltage to ~4.4-4.5 V when the SIM800L is connected.However, these might explain why their modules work: When on USB port, the Arduino's 5V pin can supply a maximum of 450 mA and when on its DC Jack, about 800 mA. 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 Read more information from the SIM800L Datasheet. Receive and make calls using the speaker and microphone outputs.Here are the features of the SIM800L breakout board: Sending and receiving texts with your Arduino have never been easier! In this Arduino SIM800L tutorial, I will help you with using this nifty device. ![]() The SIM800L is a cheap and portable GSM breakout board with all the capabilities of the larger SIM900 shields. ![]()
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