First of all, you need to configure your HC-05 module. Sketch is below. Time to setup our HC-05. At step 1 you have flashed arduino with sketch that will set up bluetooth module. Press and hold KEY ...
⚠️ IMPORTANT — Voltage Divider Required! The HC-05 RX pin is 3.3V tolerant. Arduino TX outputs 5V, which will damage HC-05 without a voltage divider. Arduino HC-05 ───────── ────────── 5V ── VCC GND ...
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