It would be nice if the SDIO pins were defined for this variant like other variants. A pinout diagram is here. I think this is the correct definition. // SDIO #define PIN_SD_CLK (18u) #define ...

Connections & pinouts. Arduino UNO SIM800L Notes (3.8v)~(4.4v)! Vcc: Power supply input, Use circuit diagram shown below: 10 RX_PIN: TX: If you are using SoftwareSerial: ... compatible with Arduino ...

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