running canon a620 via UPS (Uninterruptable Power Supply) - page 2 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum
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running canon a620 via UPS (Uninterruptable Power Supply)

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Offline Microfunguy

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Re: running canon a620 via UPS (Uninterruptable Power Supply)
« Reply #10 on: 10 / June / 2009, 14:00:51 »
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Quote from: yair on 10 / June / 2009, 12:59:14
i'm not going to be near a car

In that case I hope you are strong or the battery is from a very small car  :)
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Offline yair

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Re: running canon a620 via UPS (Uninterruptable Power Supply)
« Reply #11 on: 10 / June / 2009, 14:10:59 »
i took the battery home on my bikes, asked the shop owner for one with a good handle.
i tipped over only once :)
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Offline yair

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Re: running canon a620 via UPS (Uninterruptable Power Supply)
« Reply #12 on: 13 / June / 2009, 05:59:35 »
UPDATE:
well, it works.




set the timelapse to 60 sec (i use the night time timelapse script by fbonomi)

started shooting at 2:53am and my A640 took the last picture at 12:51pm the next day.

overall 36hr of timelapsing.

this was using a single 6V/4.5Ah lead-acid battery. it costs 35? (35? (36? (9$))).

i first checked the current consumption using a dc power supply.
i turned off the display and set the review to off (to disable picture review after shooting)

the current was showing 0.04Ah, when shooting i got 0.35Ah for a few seconds.


1. made fake batterys
using a depleted battery i had i cleaned the inside as best as i could (gooey stuff inside) and stuffed it with some putty to keep the goo inside. i then soldered the wire to the metal siding.


2. cheeped a small hole on the side of the battery compartment to allow the wires to go out, its plastic so a small pincher did the job.




3. you don't need the populate all 4 battery compartment (if you're camera use 4 batteries), you have to find the two compartments that actually connect to the circuitry, the other two are just bridged to the rest. so using a multimeter see which two compartments are connected at the bottom and place the fake batteries in the other two. make sure check the polarity.


i still haven't tried the circuit David suggested, but i made it and checked and it works so i'll try that next. from my understanding it will work for double the time, the version in the picture allows for triple the time with three batteries.
what i'm still not sure of is when should i change any of the batteries, and if they will simply all loose thier charge at the same time.




note: to charge the cells i used a 12V charger with two 6V batteries connected as such


thanks goes out to microfunguy and databoy




 
« Last Edit: 23 / June / 2009, 13:44:34 by yair »
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Offline Microfunguy

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Re: running canon a620 via UPS (Uninterruptable Power Supply)
« Reply #13 on: 13 / June / 2009, 06:20:06 »
That is more like it, 6V battery is far easier to handle !

Look forward to hearing how you get on with the script.

your drawing shows A640, do you mean A620 ?
« Last Edit: 13 / June / 2009, 06:23:54 by Microfunguy »
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Offline yair

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Re: running canon a620 via UPS (Uninterruptable Power Supply)
« Reply #14 on: 13 / June / 2009, 06:53:56 »
i actually tried running the 12v cra battery at 6v with a 7806+heatsink but the heat that thing generated was scary.

the script works but i couldn't figure out how to disable the auto focus and had a lot of jumping around in the respect. any directions? i'm sure its trivial...

does SDM has an exposure detction script similar to the night-time lua script?
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Offline Microfunguy

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Re: running canon a620 via UPS (Uninterruptable Power Supply)
« Reply #15 on: 13 / June / 2009, 08:57:36 »
SDM has an experimental sunrise/sunset feature where you can ramp the exposure up or down at three consecutive different rates before continuing at constant exposure.
You need knowledge in advance of how to set the slope of each of those three phases.
Someone has used this feature but they are keeping the results to themself at present, i assume it works (with careful planning).

SDM time-lapse automatically locks autofocus before starting the sequence.

With CHDK, your script will have to half-press the shutter and then lock focus.

If it is quite dark, the camera may have problems auto-focusing or may take longer than you expect.
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