47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
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# Stream Analog Input to I2S
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## General Description:
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In this sketch we get the data from via the ESP32 I2S ADC and send it to I2S
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Since the ADC via I2S is using the i2s port 0, we use port 1 for the output.
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### Analog Input:
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| ADC | ESP32
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| --------| ---------------
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| VCC | 3.3V
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| GND | GND
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| OUT | GPIO34
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For the input I was using a MCP6022 Microphone Sensor.
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Plaese note that the signal that we receive from the ADC needs to be adjusted so that it is oscillating around 0.
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### External DAC:
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For my tests I am using the 24-bit PCM5102 PCM5102A Stereo DAC Digital-to-analog Converter PLL Voice Module pHAT
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I am just using the default pins defined by the framework. However I could change them with the help of the config object. The mute pin can be defined in the constructor of the I2SStream - by not defining anything we use the default which is GPIO23
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DAC | ESP32
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-----|----------------
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VCC | 5V
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GND | GND
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BCK | BCK (GPIO14)
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DIN | OUT (GPIO22)
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LCK | WS (GPIO15)
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FMT | GND
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XMT | 3V (or another GPIO PIN which is set to high)
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- DMP - De-emphasis control for 44.1kHz sampling rate(1): Off (Low) / On (High)
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- FLT - Filter select : Normal latency (Low) / Low latency (High)
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- SCL - System clock input (probably SCL on your board).
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- FMT - Audio format selection : I2S (Low) / Left justified (High)
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- XMT - Soft mute control(1): Soft mute (Low) / soft un-mute (High)
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