| .. | ||
| base-i2s-a2dp.ino | ||
| README.md | ||
Stream I2S Input to A2DP Bluetooth
General Description:
We implement a A2DP source: We stream the sound input which we read in from the I2S interface to a A2DP sink. We can use any device which provides the sound data via I2S. In order to test the functionality we use the INMP441 microphone.
The INMP441 is a high-performance, low power, digital-output, omnidirectional MEMS microphone with a bottom port. The complete INMP441 solution consists of a MEMS sensor, signal conditioning, an analog-to-digital converter, anti-aliasing filters, power management, and an industry-standard 24-bit I²S interface. The I²S interface allows the INMP441 to connect directly to digital processors, such as DSPs and microcontrollers, without the need for an audio codec in the system.
Pins
| INMP441 | ESP32 |
|---|---|
| VDD | 3.3 |
| GND | GND |
| SD | IN (GPIO32) |
| L/R | GND |
| WS | WS (GPIO15) |
| SCK | BCK (GPIO14) |
SCK: Serial data clock for I²S interface WS: Select serial data words for the I²S interface L/R: Left / right channel selection When set to low, the microphone emits signals on one channel of the I²S frame. When the high level is set, the microphone will send signals on the other channel. ExSD: Serial data output of the I²S interface VCC: input power 1.8V to 3.3V GND: Power groundHigh PSR: -75 dBFS.