20-Key Matrix Keypad That Uses Four Microcontroller Pins | Jameco Electronics Project
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Amazon.com: Antrader 30CM 20-Pin IDC Connector Flat Rainbow Ribbon Cable with Black 2.54mm FC Dual Row Female to Female Sockets, 6 Pieces : Electronics
Low Voltage Wire Connectors, Brightfour 12 Pack Quick Solderless Wire Splice Connector, 2 Way Automotive Wire Connectors, Reliable Connection Small Wire Connectors I Type 2 Pins, Fits 20-24 AWG - - Amazon.com