序列埠藍牙模組（從端）：HC-06

Was honestly skeptical about swapping my wired connection for this, but it pairs instantly and the transparent data flow means zero fiddly config on my MCU. Just wired RX to TX and it's been rock solid for GPS logging for two weeks straight.

Took me ten minutes to wire this into my Arduino project, and the transparent serial link worked exactly as promised—no configuration headaches, just data flowing both ways. The slave mode paired instantly with my phone, and the board is small enough to fit anywhere.

Took it out of the packaging and soldered three pins in under five minutes—the transparent serial link worked exactly like the wired one it replaced, no extra config needed. The slave default pairing to 1234 made the MCU-to-PC log stream show up instantly, which saved me a solid chunk of debugging t