I have a automatic liquid drip project, which works based on timing.
Basically there are three manual switches and each switches will select different delays such as 2 min., 3 min. and 4 min.
When first switch is pressed, the 3v motor controlled dropper will ON only after 2 min. delay and also it OFF after 2 sec ON. Then, the same thing should happen for every 2 min. delay.
The other two switches will select to set the delay into 3 min. and 4 min. respectively for the same above operation.
Now, my question is that, how I can build such circuit using ICs. The only thing is that the circuit should not take more current during its OFF state (no dripping time duration) and also works at about 4.5V. Is there any possibilities ?