mob-io-matrix-led-4x4

4x4 Led Matrix Module Board

4x4 led switch matrix module board. This MOB can operate at both 3V3 and 5V.

Schematic

PCB Layout

Bill of Materials

• paperboard 5x7cm

• 2-pin (Molex-KK) power connector

• bulk capacitor (tantalum) 10uF 16V

• led current limiter resistor 1Kohm

• power activity led green 3mm

• 2 x 4-pin (Molex-KK) data (rows, /cols) connectors

• 4 x pull-up resistor 10Kohm

• 16 x small signal diodes

• 16 x switches SPST (NO)