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I2S

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[Electronic Circuit] Created a self-made board for bidirectional audio with ESP32+SPH0645LM4H-B (I2S) and placed an order with Elecrow.

How to use SPH0645LM4H-B as a replacement I2S mic for INMP441, wire with ESP32 to make my own board and order from Elecrow. is Elecrow cheaper PCBA cost compared to JLCPCB?

Development/Designelectronic circuit

I tried to make my own board with INMP441 added to ESP32, but INMP441 is out of stock?

I tried to make my own ESP32 board using INMP441 to develop interactive voice for “Mia,” a cat-shaped robot, but the parts were unexpectedly out of stock.

2025.04.16 2025.04.20

Development/Designelectronic circuit

Difference between PDM microphones and I2S: Why does PDM require a decimation filter?

A PDM microphone is a digital microphone that expresses audio signals as a density of pulses. The converted signal consists of “high-density ones and zeros” and includes high-frequency components that exceed the human audible range (20 Hz to 20 kHz). On the other hand, I2S microphones transmit voice data in PCM format

Development/Designelectronic circuit

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