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 ...
The MCP23009 is an 8-bit I/O expander with open-drain outputs. This device is compatible with I2C interface and operates at speeds up to 3.4 MHz. It features 8-bit remote bidirectional I/O port, low ...
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