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A very powerful and easy to use sound module.
This module is based on the MEMS SPH0645LM4H microphone with I2S interface. It is useful for most detection and recording applications thanks to the 50Hz - 15KHz range.
PDM is a little like 1-bit PWM. You clock the mic with a 1 MHz - 3 MHz clock rate, and on the data line you'll get a square wave out that syncs with the clock. The data line with be 0 or 1 logic output, with the square wave creating a density that when averaged will result in the analog value out.
The 5.1 USB Sound Card is ideal for connecting your speakers or headphones to your computer. Easy to use connects to the USB, then the headphones / microphone in the audio jack of the module.