I do a lot of simple blinky projects where I have battery (18650) powered LEDs on for 6 hours and then off for 18. Think solar LED strings, without the solar part, and only recharging about 1x a month.
Since my favorite mc the attiny85 has gotten pretty expensive (or even attiny13), I've looked for alternatives.
This worked on the breadboard- using 2 cheap c005 timer modules, triggering one another for the 'on' / 'off' pattern.
Pretty simple design i think, and cost is good- paid $0.90 for 10 c005, so 9c + about .10 in other components, the vero may be the most expensive part.
Problem is, timing.. These c005 seem pretty bad at timing, as it will change depending on the battery voltage. Boosting or regulating would cause too much battery usage.
Any thoughts on another cheap method to do simple timing, using low power? I'd expect there to be some sort of COB module doing this for things like battery powered outdoor xmas lights, but I haven't found yet.
Since my favorite mc the attiny85 has gotten pretty expensive (or even attiny13), I've looked for alternatives.
This worked on the breadboard- using 2 cheap c005 timer modules, triggering one another for the 'on' / 'off' pattern.
Pretty simple design i think, and cost is good- paid $0.90 for 10 c005, so 9c + about .10 in other components, the vero may be the most expensive part.
Problem is, timing.. These c005 seem pretty bad at timing, as it will change depending on the battery voltage. Boosting or regulating would cause too much battery usage.
Any thoughts on another cheap method to do simple timing, using low power? I'd expect there to be some sort of COB module doing this for things like battery powered outdoor xmas lights, but I haven't found yet.