1. Overview
2. Hardware Setup
3. Voice Upload Tutorial
4. Control Methods
5. Advanced Features
Read moreWhat is the MP148?
- A ready-to-use module built around the KT148A 32-bit DSP voice chip (SOP8 package).
- Key features:
- 420KB storage (up to 400s audio at 8KHz).
- Direct 0.5W speaker drive (no amplifier needed).
- Serial reprogramming via USB-to-TTL (no expensive tools).
- Ultra-low power: 25µA standby, 1.7µA shutdown.
Perfect for:
- Smart toys, industrial alarms, accessibility devices, and IoT voice prompts.
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Wiring Diagram:
MP148 Pinout:
- VBAT (Pin 8) → 5V
- GND (Pin 1) → Ground
- PB9 (Pin 2) → CH340G RX
- PB1 (Pin 3) → CH340G TX
- SPK1/SPK2 → Speaker
Step 1: Prepare Audio Files
- Convert WAV/MP3 to
.F1A
format using the provided tool (Audio Compression Tool 1.2.17
).Tip: Use 16KHz sampling for best quality.
Step 2: Enter Download Mode
- Hold Pin 5 (SPK1) to ground while powering on. Release after "beep."
Step 3: Upload via Serial Tool
- Connect CH340G to MP148 (TX/RX crossed).
- Open
VoiceCom_V8.exe
, select COM port (115200 baud). - Load
.F1A
files → Click "Download All."
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Option 1: One-Wire Serial (For MCUs)
- Send commands like
0x01
(play voice 1) or0xF3
(combination playback). - Example Arduino code:
void playVoice(int voiceNum) {
digitalWrite(ONELINE_PIN, LOW);
delayMicroseconds(6000); // Start pulse
for (int i = 0; i < 8; i++) {
// Send LSB-first data (simplified)
}
}
Option 2: Button Trigger
- Ground Pin 4 (PB0) to play next voice segment.
- Ultra-Low Power Mode: Send
0xF0
to reduce power to 1.7µA. Wake via 40ms low pulse. - Volume Control: 15 levels (
0xE0
–0xEF
). - Combination Playback: Chain up to 30 voices with
0xF3
.
Q: No sound after upload?
- Verify Pin 5 is floating (not grounded) during normal operation.
Q: Audio choppy?
- Add a 10µF capacitor between VBAT and GND for stable power.
Q: Need louder output?
- Use larger speakers (up to 8Ω 2W) or external amps (e.g., HAA8002D).
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