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                Figure 1 from Design and realization of general matrix keyboard based
 
                          
                Handwired Keyboard Build Log - Part 1 - Masterzen’s Blog
 
                          
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![[DIAGRAM] Nokia 101 Keypad Ic Diagram - MYDIAGRAM.ONLINE](https://i2.wp.com/wiki.sunfounder.cc/images/f/f9/Keypad_schematic.png) 
                          
                [DIAGRAM] Nokia 101 Keypad Ic Diagram - MYDIAGRAM.ONLINE
 
                          
                Connect a 4×3 matrix keyboard to a microcontroller using two I/O pins - EDN