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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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AT Commands for Bluetooth Module (HC-05 W/ EN Pin and BUTTON) Using Arduino Board! : 5 Steps - Instructables
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HC 05 6 Pin Wireless Bluetooth RF Transceiver Module for Arduino BT Serial Pass Through Module HC05 Wireless Serial|Integrated Circuits| - AliExpress
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