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esp32 s3 + external dac #31

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Cheapy-D opened this issue Jun 15, 2022 · 2 comments
Open

esp32 s3 + external dac #31

Cheapy-D opened this issue Jun 15, 2022 · 2 comments

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@Cheapy-D
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I was wondering if I could use a external dac since the esp32 s3 doesn't have one.
like this one from adafruit: https://www.adafruit.com/product/935 ?
I already have it I just need to know how if possible

@UncleRus
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This DAC is too slow. It supports up to 3.4MHz i2c clock, but ESP32 i2c driver only supports 1MHz max. To set output voltage on it, you need to write 4*9 = 36bits. This gives a maximum theoretical analog voltage update rate of approximately 27 kHz (actually even less).

@willfurnell
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Would there be a DAC that would work do you think? I also have an S3 and would be interested in getting this working

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