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Topic: Batteries, howto make a board that can run a year? (Read 2 times) previous topic - next topic

Udo Klein

I do not know what the boards will be for and which number of boards you plan. Everything of design, assembling and implementation can be outsourced. However this is not cheap either ;) But at least you can trade money for time.
Check out my experiments http://blog.blinkenlight.net

Senso

Learn about sleep modes and if its only to log temperatures run the micro with the internal 8Mhz RC and with clockdiv on, the slower it is the less power it uses, dont put any unecessary always on leds and minimize resistor use.

Udo Klein

CKDIV will only reduce total power consumption if you also lower the voltage. Otherwise you will have to stay awake longer which in turn leads to MORE power consumption. This is because you basically transport the same amount of charge per cycle. However running with CKDIV means MORE cycles for the oscillator. So if you have to lower power consumption decrease voltage as much as possible. Then setup CKDIV to still run stable at that voltage. Alternative option: run with the watchdok oscillator only @128kHz.

Anyway: have a look at the datasheet and turn off whatever you do not need (e.g. serial, A/D converter)
Check out my experiments http://blog.blinkenlight.net

van zwam

I did read your topic just now.
But to me it don't seem to be necessary to search for extreme small power consumption.
I am currently working (also in spare time) on a batterieloader for reloadbatteries, based on arduino.
The purpose is to disconnect from power supply (in my case 230 ac) if the load is complete via a optocoupler.
But in your case i would work with solar power (a small surface should do) and reload batterypack (4x 1.2 volt cells do very well for this purpose).
How it would best work in case of solar power supply : that needs some work out, because i also had some problems with to make it all go smooth.
But mainly i think a combination of the solar cell + a constant current source toward the batterypack should do.
In this way it must be possible to build easily a device that works even over a year or even two and weighs less than  1 kg.

emyr666

Could you hook up a rechargeable battery to a PV cell and have it trickle charged from the sun during the day? That could help get it to last a bit longer.

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