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Using 2 C005 Timer modules for an on-off timer switch, alternatives for timing, low power?

David0101

May 10, 2020
4
Joined
May 10, 2020
Messages
4
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.
 

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crutschow

May 7, 2021
520
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May 7, 2021
Messages
520
I have some battery powered LED candles which turn on for about 5-6 hours or so each day and then turn back on in 24 hours.
The on-time starts when you initially turn them on.
Seem to be fairly accurate as I have a half dozen that I turn on at the same time, and they seem to stay in fairly good sync over a several week period (until I have to recharge their batteries).
A chip like they use (I assume it's a chip) might work for you.
 

David0101

May 10, 2020
4
Joined
May 10, 2020
Messages
4
I have some battery powered LED candles which turn on for about 5-6 hours or so each day and then turn back on in 24 hours.
The on-time starts when you initially turn them on.
Seem to be fairly accurate as I have a half dozen that I turn on at the same time, and they seem to stay in fairly good sync over a several week period (until I have to recharge their batteries).
A chip like they use (I assume it's a chip) might work for you.
yep, exactly what I'm looking for- do you know what the chip is in this?
 
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