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TTGO TCall & SIM800C DS V02 ESP32 WIFI Bluetooth Nano Card Slot SIM800C Development Board Mounting Bracket for HC SR04 Ultrasonic Module 5% measurement accuracy 5% measurement accuracy Production Ready: SMT mounting is compatible with pick and place machines and reflow ovens for scalable manufacturing Use the Serial Monitor to verify module initialization with commands like AT and AT+CPIN You can transmit data via whichever connection is available or use WIFI as primary with cellular as backup for redundancy
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