I want to build a very small, low power timer that will allow several LED's on for 4 seconds and then off for about 200 seconds, then repeat. 4.5VDC. No programming.
Help please – thanks.
Timer for turning LED’s on for 4 seconds and then off for about 200 seconds
ledtimer
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Best Answer
If you don't want to use a tiny microcontroller (PIC10F family is good), you can do what you want by cascading two timers.
Have a look at the datasheet for a CD4060. This is a CMOS multi-stage binary divider chip with built-in oscillator. You can configure that chip to have a total period of 200 seconds.
The output of that chip feeds the trigger input of a TLC555 CMOS 555 timer chip via a coupling capacitor. You can set the ON-time of the 555 to 4 seconds.
But using a PIC10F chip is much, much smaller and would consume less current. I really like the PIC10F322 - very, very nice chip in a SOT23-6 package.