Circuit for Two Seven Segment Displays, Arduino Mega + 7490 + 4511 (Part 1 of 9)

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          In the last blog, we saw the circuit to control a common cathode seven segment display using an arduino mega, a 7490 and a 4511. Here, we will design a circuit to control two common cathode seven segment displays using an arduino mega, a 7490 IC and two 4511 ICs. Circuit is done as shown in the following diagram.

          Complete the circuit. Ground terminal of external voltage source and ground pin of arduino should be interconnected. Otherwise, circuit will not work. Read the remaining part in next page.

Continued in Next Part (Part 2) >>>>