Help Needed to build LED timer circuit

[Donnytella]

Hi everyone, I am fairly new to electronics and I need some help to find a circuit for a project I want to work on.

I need to design/build a circuit that switches on a Green LED for 30 seconds. After the 30 seconds it needs to switch off the GREEN LED and switch on a RED LED for 30 seconds... I would like this cycle to continue until the power is switched off to the circuit.

If possible it would be good to have the cycle time variable, and also to sound a buzzer/vibrator for 2 seconds when the GREEN LED is switched on.


Sounds easy, but not when you new to this like me....

If anyone can help with a circuit they have (any description on how it works too if possible) then I would be really grateful.

excellent site by the way

Terry

 

[canadaelk]

A simple way to do this is using a 555 timer IC. The output can sink and source enough power to drive LEDs. The timing duration can be easily changed with a variable resistor. Check this: https://www.555-timer-circuits.com/bi-polar-led-driver.html