Arduino nano + 7segLED : Rahmen Timer

It is a rahmen timer that used Arduino. After the test pattern is displayed in seven segments LED, the count is started for three minutes.
1 x Arduino nano
1 x Breadboard
1 x TD62083AP(Transistor Array)
3 x 7 segment led(Common cathode)
8 x register 220ohm
1 x Electric buzzer

Arduinoを使ったラーメンタイマーです。
7セグメントLEDにテストパターンを表示した後、3分のカウントを始めます。
3分後にはアラームが鳴って「らうめん」が出来たことを教えてくれます。
詳細情報は下記リンクにて
http://juncoffee.jp/arduino/led_7seg.html

Category:

Science & Technology

Tags:

• Arduino
• 7seg_LED

[juncoffee]

Hello!

The timesharing display with software is done without using special parts in this timer.

The terminal D2-D9 is connected with each terminal of A-G and dp.

The terminal D10-D12 is connected with each 7SEG-LED.

The luminescence pattern of LED is output to D2-D9, and either of D10-D12 is specified sequentially.

If 3-8 decoders are added, eight 7SEG-LED or less can be connected.

-juncoffee-

[joebro391]

any multiplexing involved? you used 12 pins, minus one for the buzzer. So 11 pins to control 21 pins. Any tips on multiplexing 7-segment displays? maybe I just counted wrong. Thanks for any help you can provide. -Joe