PowerShot SX230 HS - Porting Thread - page 31 - General Discussion and Assistance - CHDK Forum
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PowerShot SX230 HS - Porting Thread

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Offline AK49BWL

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Re: PowerShot SX230 HS - Porting Thread
« Reply #300 on: 07 / September / 2011, 06:29:18 »
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A quick question, tho I'm not sure if I'm in the right place to ask... What is the maximum input voltage these cameras can take from the battery? CHDK says the power adapter I got for it is giving the camera anywhere from 4.5 to 4.8 volts. I'm looking to build a custom AA battery pack which will utilize NiMH batteries (around 1.35-1.4 volts per battery at full charge) and i would really like to use 4 if the camera can handle up to 5.6 volts. The camera likes to shut off below 3.45 volts, and I don't know how long 3 batteries (about 4 volts) will last. I've gotten my continuous video time-lapse script working and really don't want to be held down by a power cord... But I also really don't want to fry it due to overvoltage.
« Last Edit: 07 / September / 2011, 06:31:20 by AK49BWL »
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Canon SD770IS GM1.00A
Canon SX20IS GM1.02B
Canon SX230HS GM1.00C (RIP :()
Canon SX130IS GM1.00B
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Offline daddyx

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Re: PowerShot SX230 HS - Porting Thread
« Reply #301 on: 07 / September / 2011, 12:15:31 »
I found this website to be very informative with regards to battery types and their characteristics.
http://batterydata.com/
I think Canon NB-5L battery is rated 3.7V. Since each AA NiMH battery is approx. 1.2 to 1.4V depending on the discharge level, your idea of using a battery pack of 4 should work. At first, I was worried like you about the potential high voltage (4 x 1.4) = 5.2V, but I read that 1.4V only applies to freshly charged batteries that is not discharging, i.e., not being used. You might like to refer to http://en.wikipedia.org/wiki/Nickel-metal_hydride_battery for the details.
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Offline daddyx

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Re: PowerShot SX230 HS - Porting Thread
« Reply #302 on: 07 / September / 2011, 12:19:25 »
Sorry. A couple of mistakes from my earlier post. 4 x 1.4 = 5.6V. Three AA batteries should give around 3.6 - 3.75V under normal use.
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Offline AK49BWL

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Re: PowerShot SX230 HS - Porting Thread
« Reply #303 on: 08 / September / 2011, 04:20:50 »
Short answer: a set of four works fine... In fact I think the pack may never die it's lasting so long.

Here's the thing though: I grabbed my voltmeter and checked the pack before hooking up the camera, and it was right around 5.05 volts... When hooked up to the camera, the pack showed only 4.787 volts, and I still had the voltmeter hooked up to it, showing 5.03 volts.. Ooookay then. Well at any rate I left it connected a while and ran a video, nothing overheated so I guess it's okay :D

Also tried the same pack on my SD770, which only showed a little over 4.5 volts... but still worked fine lol
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Canon SD770IS GM1.00A
Canon SX20IS GM1.02B
Canon SX230HS GM1.00C (RIP :()
Canon SX130IS GM1.00B
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Offline sylikc

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Re: PowerShot SX230 HS - Porting Thread
« Reply #304 on: 08 / September / 2011, 19:39:22 »
Quote from: taliesin on 02 / September / 2011, 05:58:05
Hiya,

I finally got a free evening to look at the ISO400 bug. I think I managed to crack it, not sure what else I have broken in the meantime ( I kind of wish I have made a backup copy of the source at Beta04, as I cant remember what changes I have made since then )

Sorry for taking so long I have been quite busy and I was origionally only going to spend a four day weekend on this project..

As always use at your own risk
CHDK sx230 firmware version 1.01A
Diskboot.bin   -   http://www.box.net/shared/upb0772a7o5evde4cghx
PS.FI2   -  http://www.box.net/shared/dms1thh7r325pry8d8fo

Is it me or on this version the keyboard feel a lot less responsive?

I would offer to help with the 1.01B but am too busy. If anyone wants any pointers feel free to PM me.

Let me know how it fares,

Taliesin

Taliesin,

You're my hero!  Thanks for taking all this free time to work on CHDK for us who are less skilled ;).  We've missed you here~

Well, I've had quite a time with the ISO400 bug, having to constantly remember to set it when indoors, or unlock my card.

I've ran into another possible bug (I'll do more testing tonight to see if it actually happens consistently, and/or if it still appears in the latest build) but it has something to with recording video.  In certain cases, when CHDK is running on v1.01a when I do a zoom the camera will just freeze.  It's happened at least once in afternoon lighting and once indoors.  Once again, I'll see if i can nail down how to reproduce it.

Thanks!
/sylikc
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props to TPC + PhyrePhox for SD750 work: IXUS75/SD750 1.01a | 1.00b | 1.02a Thread
props to quietschi for multipartition support + button fixes!
SD750 bracketing issues
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Offline sylikc

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Re: PowerShot SX230 HS - Porting Thread
« Reply #305 on: 08 / September / 2011, 19:45:51 »
Quote from: AK49BWL on 08 / September / 2011, 04:20:50
Short answer: a set of four works fine... In fact I think the pack may never die it's lasting so long.

Here's the thing though: I grabbed my voltmeter and checked the pack before hooking up the camera, and it was right around 5.05 volts... When hooked up to the camera, the pack showed only 4.787 volts, and I still had the voltmeter hooked up to it, showing 5.03 volts.. Ooookay then. Well at any rate I left it connected a while and ran a video, nothing overheated so I guess it's okay :D

Also tried the same pack on my SD770, which only showed a little over 4.5 volts... but still worked fine lol

AK49BWL,

how long does the 4xAA NiMH last?  How many % is CHDK reporting?  That is an absolutely cool mod. 

Would you be able to provide a simple DIY guide to building the custom battery pack?  I could definitely find a battery holder for 4xAA's from any of my other broken devices, but there are 3 contacts on the battery, what do I do with the 3rd one?  How are you getting to the contacts in the camera anyway? 

Lastly, how are you currently mounting the pack to the camera... by tape?  tripod socket?

My NiMH batteries typically peak out at 1.33V at max charge.  Burn them down a little, and put in like 2000mAh, and man, it'd definitely solve this horrible CIPA shots-per-battery Canon p&s's have... no need to carry around custom batteries (ya got a really epic idea!)

/sylikc
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props to TPC + PhyrePhox for SD750 work: IXUS75/SD750 1.01a | 1.00b | 1.02a Thread
props to quietschi for multipartition support + button fixes!
SD750 bracketing issues
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Offline AK49BWL

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Re: PowerShot SX230 HS - Porting Thread
« Reply #306 on: 09 / September / 2011, 11:19:49 »
I actually bought the battery holders for my radio control plane and car to run the receiver/servos, which would leave the main battery pack to run the motor that NEEDS the main battery's power... Here's the link. For the camera side, various people make AC power adapters for these model cameras; I have one for my SD770 (NB-6L) and one for this one. Example here. Look on the battery door.. Ever wondered what that little piece of rubber covers? That's where the power plug lines up ;) And last but not least, here's pictures of the rig I have currently....
The entire thing (camera, mount, battery packs) -- Battery packs w/ 8 total Duracell 2650mAh NiMH AA batteries (4+4 in parallel) :D -- Camera on, powered by the packs -- Voltage registered by the camera vs volt meter... That's the part I find odd.

I do not carry around the camera with the battery pack; this setup is for prolonged use where I don't have access to a close-by AC outlet... Time lapse video, to be specific. However, you could probably run much longer wire between the pack and camera, that way the battery pack can stay in your pocket or something while you use the camera. I have no benchmarks as to how long the pack(s) last yet, as I have yet to use them... But I'd be willing to say it'd probably last well beyond a day of continuous use.

For those that may wonder, the mount I have it on is nothing more than a spring clamp and a cheapo tripod (link) with no legs. Very handy as an in-car dash camera mount... Or pretty much anywhere mount, lol.

Oh, one thing I did forget to answer... The middle terminal on the battery is for temperature monitoring, and is not required for the camera to have power.
« Last Edit: 09 / September / 2011, 11:25:15 by AK49BWL »
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Canon SD770IS GM1.00A
Canon SX20IS GM1.02B
Canon SX230HS GM1.00C (RIP :()
Canon SX130IS GM1.00B
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Offline sebastc09

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Re: PowerShot SX230 HS - Porting Thread
« Reply #307 on: 09 / September / 2011, 13:49:57 »
Hii! what's happen with the firm 1.01B? any news? I come to the forum many times at day watching for news :P it's still doesn't working? i wanna help but I don't know how :(

P.S: Sorry for my bad english
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Offline taliesin

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Re: PowerShot SX230 HS - Porting Thread
« Reply #308 on: 09 / September / 2011, 18:12:03 »
Quote from: sebastc09 on 09 / September / 2011, 13:49:57
Hii! what's happen with the firm 1.01B? any news? I come to the forum many times at day watching for news :P it's still doesn't working? i wanna help but I don't know how :(

P.S: Sorry for my bad english
Is there a firmware dump avaibable?
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Offline philmoz

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Re: PowerShot SX230 HS - Porting Thread
« Reply #309 on: 09 / September / 2011, 19:22:26 »
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CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
  sx40hs (1.00d, 1.00g & 1.00i)
  g1x (1.00e, 1.00f & 1.00g)
  g5x (1.00c, 1.01a, 1.01b)
  g7x2 (1.01a, 1.01b, 1.10b)
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