购买 PCF8574 I2C Expander Arduino

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16-key keypad with an Arduino and a PCF8574 I/O expander module — Curious Scientist
curiousscientist.tech
16-key keypad with an Arduino and a PCF8574 I/O expander module — Curious Scientist
In this video I show you a nice way to connect a 16-key keypad to an Arduino (or any i2C compatible microcontroller) with a smart device. The smart device is a PCF8574 I/O expander which allows us to have 8 I/O ports controlled via i2C. It is a great device because we do not need to sacrifice any of
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