The range includes separate and combined 16-point digital input and output modules, an 8-input + 4-output analogue module, and an 8-channel relay output module – all with standard industrial signal ...
A while ago I received a couple of I/O port expander modules that use the I 2 C protocol. Using that Chinese module, you can use only the SDA and SCL pins of your Arduino, or any microcontroller ...
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