Some resources to help you getting started with STM32 programming.
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4x4 Matrix Keyboard Small:
A keypad is the most widely used input devices of a microcontroller. In order to use it effectively, we need a basic understanding of them.
Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to I/O line. But we cannot connect, say 10 or 100 keys directly MCUs i/o. Because :
We want to avoid all these troubles so we use some clever technique. The technique is called multiplexed matrix keypad. In this technique keys are connected in a matrix (row/column) style.
Size: 38 x 43 mm approximately