Ask everyone:
Make a small board with the following functions:
1. The voice/voice information transmitted through the GSM module can be played, and the volume can be changed by the "+" and "-" buttons, and the music/voice playback can be stopped by the "confirm" button;
2. Vibration function can be realized;
3. The control indicator flashes;
4. Control the screen display.
Now a GSM module has been selected.
consult:
Which solution is the most cost-saving, is the single-chip computer + voice chip + power amplifier chip mode? There are other more cost-saving solutions.
If you use a single-chip computer + voice chip + power amplifier chip, is there a cheap voice chip and power amplifier chip recommended? (No requirement for voice effect)
Emanuel ポストする September 23, 2020
Of course, you can cancel the single-chip microcomputer and add a power amplifier to the module.
Martha ポストする September 23, 2020
Many Bluetooth speakers use Jerry's solution, and the chip inside is only Jerry MCU + power amplifier.
River ポストする September 23, 2020
To say that the most cost-saving way is to directly connect the PWM to a small speaker module, the sound will not be very loud, and the noise can be completely heard within 2 meters.
