You should use an MCU with PWM generators to do that.

The problem with PWM is that the max resolution is quite low (10-bit) so you are effectively limited to 8-bit PCM.

• Use a DSP editor like Audacity to export a 16KHz unsigned 8-bit WAV.
• Import the WAV file as an array of unsigned char.
• Set your PWM freq to the resonant freq of your speaker (eg. 31250Hz)
• Set your PWM timer to fire at 16KHz and set the PWM duty cycle to the next array value.

I use 16KHz sample rate because:

• Reduced memory footprint
• Fewer timer interrupts
• PWM's limited resolution does not seem to benefit from anything above 16KHz
• I use piezo speakers directly wired to PWM pins in H-bridge.
• A separate amp module might bebefit from higher sample rates.

You should use an MCU with PWM generators to do that.

The problem with PWM is that the max resolution is quite low (10-bit) so you are effectively limited to 8-bit PCM.

• Use a DSP editor like Audacity to export a 16KHz unsigned 8-bit WAV.
• Import the WAV file as an array of unsigned char.
• Set your PWM freq to the resonant freq of your speaker (eg. 31250Hz)
• Set your PWM timer to fire at 16KHz and set the PWM duty cycle to the next array value.

I use 16KHz sample rate because:

• Reduced memory footprint
• Fewer timer interrupts
• PWM's limited resolution does not seem to benefit from anything above 16KHz
• I use piezo speakers directly wired to PWM pins in H-bridge.
• A separate amp module might benefit from higher sample rates.

You should use an MCU with PWM generators to do that.

The problem with PWM is that the max resolution is quite low (10-bit) so you are effectively limited to 8-bit PCM.

• Use a DSP editor like Audacity to export a 16KHz unsigned 8-bit WAV.
• Import the WAV file as an array of unsigned char.
• Set your PWM freq to the resonant freq of your speaker (eg. 31250Hz)
• Set your PWM timer to fire at 16KHz and set the PWM duty cycle to the next array value.

You should use an MCU with PWM generators to do that.

The problem with PWM is that the max resolution is quite low (10-bit) so you are effectively limited to 8-bit PCM.

• Use a DSP editor like Audacity to export a 16KHz unsigned 8-bit WAV.
• Import the WAV file as an array of unsigned char.
• Set your PWM freq to the resonant freq of your speaker (eg. 31250Hz)
• Set your PWM timer to fire at 16KHz and set the PWM duty cycle to the next array value.

I use 16KHz sample rate because:

• Reduced memory footprint
• Fewer timer interrupts
• PWM's limited resolution does not seem to benefit from anything above 16KHz
• I use piezo speakers directly wired to PWM pins in H-bridge.
• A separate amp module might bebefit from higher sample rates.