When i change the port on the mux, all other ports go to low. I can not imagen this is how it should work. How could i switch two or more devices/leds to ON if this is normal behaviour? Could anyone help me? I include my test scetch here. I have been seeking an answer for days's now. Maybe the mux i…

[image] PaulRB: If you need a mix of inputs and outputs, you can use pcf8574 or mcp23008 (8 pins) or pcf8575 or mcp23017 (16 pins). These chips are clever, you can attach many of them to the same arduino pins (SDA, SCL) to give you a large number of pins which can be either inputs of outputs in …

74HC4067 MUX switches all output ports to low after port change

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Paul_B April 14, 2022, 10:38am 3

No they don't. They go open circuit.

You use a shift register. 74HC595

Do read the instructions.

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74HC4067 MUX switches all output ports to low after port change

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