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You need a voltage divider between the Rx ping of the bluetooth module & the Tx pin of the arduino if you don't want to fry your hc-05 (like I did). The bluetooth module wants 3.3v and if u give it 5v, it will only be a matter of time until it fries (10 minutes for me).
Yes, you do. I fried my module by doing exactly what was described here. Mine worked for 10 minutes then went dead after that.
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