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Connecting more than 2 I2S mems microphones

Posted: Wed Jul 15, 2020 10:45 am
by RedPolo
Hello everyone,

this might be a stupid question, but I have to compare the output of 5 mems microphones and I am very confused.
I would like to use an Raspberry Pi 3B and I was able connect two I2S mems microphones onto it using the I2S GPIOs 18 until 21. Is it possible to connect more onto other Pins if I configure them correctly? Or do I need to search for other hardware?

Kind regards

Re: Connecting more than 2 I2S mems microphones

Posted: Wed Jul 15, 2020 11:43 am
by trejan
You can't do 5 without more hardware. There is only a single I2S interface on the Pi and it only supports 2 channels. You need a USB to I2S interface or do what the Audio Injector Octo does and use a FPGA to multiplex it.