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4.1. Power Supply
The power supply range of SIM800L is from 3.4V to 4.4V. Recommended voltage is 4.0V. The transmitting burst will cause voltage drop and the power supply must be able to provide sufficient current up to 2A. For the VBAT input, a bypass capacitor (low ESR) such as a 100 μF is strongly recommended.
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int web_port = 80;
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String web_mainPage = "GSMout";
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Demonstração em vídeo do trabalho pode ser vista aqui.