2022 Jiangxi Provincial Electronics Thematic Competition 2024-04-20_17-22-05

Design a pulse generator with an oscillation period of 1 to 2 seconds as the counting pulse source.
Use a toggle switch to control whether the counter counts. When the switch is off, the counter does not count
. After power-on reset, the digital tube should display "0".
2a. After power-on, turn the switch on, and the counter starts counting. The digital tube should cycle through
"0"—"5"—"2"—"1", representing the date of the competition, May 21st.
2b. After power-on, turn the switch on, and the counter starts counting. The digital tube should cycle through
"off"—"5"—"2"—"1", representing the date of the competition, May 21st.
Note: The cycled display content of 2a and 2b is different. Participants are required to choose one (
in fact , only one can be chosen). 2b is more difficult and scores higher due to its creative aspect.
3. Use a green LED to display the working status of the counting pulse source, with the LED flashing at a period of 1 to 2 seconds
. Use a red LED as a power indicator.