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The keypad circuit diagram
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Arduino keypad with 1 analog pin
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![20-Key Matrix Keypad That Uses Four Microcontroller Pins | Jameco](https://i2.wp.com/www.jameco.com/jameco/workshop/JamecoBuilds/20-Keypad-Fig1.png)
![How to use Matrix Keypad](https://i2.wp.com/docs.toradex.com/101907-matrix-schematic.png)
How to use Matrix Keypad
![Numeric keypad with serial or SPI interface » EE & IT blog](https://i2.wp.com/www.leniwiec.org/wp-content/uploads/2012/01/schemat.png)
Numeric keypad with serial or SPI interface » EE & IT blog
![Controller Keypad Schematic - W/ Arduino Mega - OSHWLab](https://i2.wp.com/image.easyeda.com/histories/e6e4cee8682e4efe82eaee28349ab779.png)
Controller Keypad Schematic - W/ Arduino Mega - OSHWLab
![Arduino Keypad Wiring Diagram](https://i2.wp.com/www.circuitbasics.com/wp-content/uploads/2017/04/How-to-Set-Up-a-Keypad-on-an-Arduino-I2C-LCD-Output-Wiring-Diagram.png)
Arduino Keypad Wiring Diagram
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![The keypad circuit diagram | Download Scientific Diagram](https://i2.wp.com/www.researchgate.net/profile/Adedeji-Michael/publication/317305160/figure/fig2/AS:500760507289606@1496402016945/The-keypad-circuit-diagram.png)
The keypad circuit diagram | Download Scientific Diagram
![Only Three Pins for a 4x3 Keypad - Hackster.io](https://i2.wp.com/hackster.imgix.net/uploads/attachments/660623/arduino_analogkeyb_jUXIXlpbKn.jpg)
Only Three Pins for a 4x3 Keypad - Hackster.io