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[SOLVED] I2c and SPI Maximum num of device can connect

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Hello, in I2C you can use 128 devices and in SPI the theoretical max is 4 devices but using mux and binary decode you can use a lot of them.
 
In SPI the only real limit is the transfer speed needed, since you normally use the same data and clock line for all devices.

Each device will need a separate strobe or select line, but as already said, that can be decoded by multiplexers.
 
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