SIM808 GPRS GPS Development Board Module SMA With GSM GPS Antenna For Arduino
ab 3,52 €
TTL serial interface: a TTL level interface. And if use the STM32 MCU, the pin of VMCU should be connected the DC3.3V. The pins of RXD is the RXD of SIM808 and the pins of TXD is the TXD of SIM808.
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