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Amazon.com: HiLetgo HC-05 Wireless Bluetooth RF Transceiver Master Slave Integrated Bluetooth Module 6 Pin Wireless Serial Port Communication BT Module for Arduino : Electronics
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hc 05 - Problem activating HC-05 AT command mode with Arduino Uno Bluetooth shield - Arduino Stack Exchange
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HC-05 zs-040. Some commands only work when pin 34 is HIGH - Networking, Protocols, and Devices - Arduino Forum
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