4*4 Matrix Keypad Keyboard Module solder free A convenient input and output

A convenient input and output header allows additional modules to be daisy-chained

TFT LCD and other electronic components to DIY a functional mini digital oscilloscope

Since the output voltage can therefore be directly connected to the MCU built A / D digital / analog converter

Connect a DC 5V-9V power to the GND and VCC

Piezo buzzer

4*4 Matrix Keypad Keyboard Module solder free A convenient input and outputThe 4 x 4 matrix keypad usually is used as input in a project. It has 16 keys in total, which means the same input values. The 4 x 4 Matrix Keypad Module is a matrix non encoded keypad consisting of 16 keys in parallel. The keys of each row and column are connected through the pins outside pin R1 R4 as labeled beside control the rows, when L1 L4, the columns. A 44 matrix keypad consisting of microswitch buttons. The module has four holes 3mm (M3)