16-key keypad with an Arduino and a PCF8574 I/O expander module
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 the native I/O ports of the Arduino since we use the i2C pins. With this additional module it is really simple to handle this 16-key keypad. This demo will show you how you can enter numbers, how you can delete characters and how you can pass the numbers to some numerical type variables (double, float, int...etc). Join my channel membership: / @curiousscientist Source code: https://curiousscientist.tech/blog/16... If you want to buy the same modules, tools...etc. I use, please look around on my website. These products are affiliate products, so when you buy something using my links, you are helping me and it does not cost you anything. https://curiousscientist.tech/tools
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