4x4 Keypad with Adhesive Backing
LED Button Tactile Switch
Quad Buffer Line Driver (Through Hole)
USB 2.0 Cable Type A Male to Type B Male - 10 FT
USB Cable Type A Male to USB Type A Male - 3 FT
Type K Thermocouple - Temperature Sensor
NEMA 17 Stepping Motor (62 oz-in 5mm single shaft)
Similar to a push button is array of keys are all tied together and will provide continuity with the rows and column. This allows the 16 key to be read using only 8 connections. The method to get the key pressed is to scan the rows and columns.