Settable countdown timer

⚠️LAG WARNING!⚠️ Button arrangement is below •Top Far left = +10 min •Top Middle left = +1 min •Top Middle right = +10 sec •Top Far right = +1 sec •Middle Far left = -10 min •Middle Middle Left = -1 min •Middle Middle Right = -10 sec •Middle Middle Right = -1 sec •Bottom = Start/Stop The timer cannot be started if it displays 00:00. You can only adjust the timer when it's paused. Red LEDs turn on when the timer stops (and turn off when it is changed), the yellow LED indicates if the timer is paused, and the two green LEDs make up the colon (“:”) to differentiate between minutes and seconds. When building this in the real world with real components, replace the 47 μF capacitor connected to the Trigger pin on the 555 timer with a 68 μF capacitor Bookmark the circuit and enjoy! 😁

published 2 years ago