SIM808 Module GSM GPRS GPS Development Board SMA W/ GPS Antenna for Arduino
17,33 €
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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