Supports read/write files to USB flash drive or SD card (CH375 only support USB flash drive). Why use this chip if there is already a library to handle the SD card ...
The I2CKeyPad library implements the reading of a 4x4 keypad by means of a PCF8574. Smaller keypads, meaning less columns or rows (4x3) can be read with it too. Since 0.3.2 the library allows a 5x3, ...
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