Serial-Controlled MP3 Playback Module

The DFPlayer Mini is a miniature, economical MP3 playback module engineered for reliability in professional voice-enabled systems. Physical size: 28 × 20 × 3.5 mm; weight: ~4 g. It performs real-time hardware decoding of MP3, WAV, and WMA files, outputting through a 24-bit DAC with 90 dB dynamic range and 85 dB signal-to-noise ratio. Sampling rate support covers 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, and 48 kHz. It fully supports FAT16 and FAT32 file systems, accepting microSD (TF) cards up to 32 GB, USB storage up to 32 GB, and 64 MB NOR Flash. Volume control spans 30 levels, and 6-band EQ provides acoustic tailoring. Control options include UART serial commands, digital IO signals, and analog AD-key inputs. Audio is managed in folders — maximum 100 folders, each containing up to 255 files. Its voice-priority function automatically pauses background audio during high-priority announcements and restores playback afterward. Commonly applied in: vehicle navigation speech synthesis, highway toll booth voice prompts, railway and bus terminal safety instructions, monitoring room alerts (energy, telecoms, banking), gated vehicle access verification, border checkpoint announcements, multi-channel alarm devices, electric sightseeing bus commentary, electromechanical fault reporting, fire alarm voice alerts, and automated periodic broadcast systems.