SIP Socket (2.54mm, Straight, 1x40 Way)
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4x3 Keypad is used to allow user to key in decimal number (0-9), * and # keys.
7 Segment Display is used to display decimal number from 0-9.
Wafer Header (2.54mm, Straight, 1x2 Way)
The ULN2003A is a seven channel Darlington (NPN) array which able to control seven output.