Battery third (temp) terminal as multipurpose analogue input - page 19 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum
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Battery third (temp) terminal as multipurpose analogue input

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Offline novsela

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #180 on: 05 / June / 2014, 14:38:04 »
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the cheapest camera with Li battery  I can buy is Canon power shoot A2500
(http://www.dpreview.com/products/canon/compacts/canon_a2500/specifications)

Can I used this camera with temp trigger ?  I am planning to build 180/360 deg rig with 24 cams (at least...) , set the cameras in portrait position (Vertical) around 3 meter steel ring.

Regarding to build / buy/ barrow no problem ...
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Offline reyalp

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #181 on: 05 / June / 2014, 16:23:31 »
Quote from: novsela on 05 / June / 2014, 14:38:04
Can I used this camera with temp trigger ?
It is very likely that all the CHDK cameras with an Li battery have a temp sensor which can be read.
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Offline novsela

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #182 on: 05 / June / 2014, 17:20:03 »
Important question

 when shooting with multiple cameras simultaneously , is it require to set the picture setting (such as ISO , Shutter speed , white balance ....)?  if so how can it be done ?
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Offline ahull

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #183 on: 05 / June / 2014, 18:53:03 »
Quote from: reyalp on 05 / June / 2014, 16:23:31
Quote from: novsela on 05 / June / 2014, 14:38:04
Can I used this camera with temp trigger ?
It is very likely that all the CHDK cameras with an Li battery have a temp sensor which can be read.

Furthermore looking at various pictures of the genuine Canon CB-2LF charger for the NB-11L, and pictures of the Canon battery and various after-market batteries, there is a 99% certainty that the A2500 features a temperature sensor connected to the middle pin of the three terminals.

To be 100% certain you would need to look for the associated functions in the firmware.
« Last Edit: 05 / June / 2014, 19:17:32 by ahull »
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Offline waterwingz

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #184 on: 05 / June / 2014, 21:35:53 »
Quote from: novsela on 05 / June / 2014, 17:20:03
when shooting with multiple cameras simultaneously , is it require to set the picture setting (such as ISO , Shutter speed , white balance ....)? 
It is not required but is certainly a good idea. You can most likely shoot in AUTO mode with the default Canon settings and things will be fine.

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if so how can it be done ?
As I explained in the other thread, with a start-up script. 

You could probably also send command over ptp using a Lua script on your PC.
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Offline novsela

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #185 on: 10 / June / 2014, 05:38:44 »
I would like to leave my option open so I consider to purchase Canon A2500 (Li Battery Camera) and build dummy battery powered by external power supply
in this case how shall i handle the 2nd terminal (temperature)? adding resistor ?
create battery similiar to Karmaschinken design ?

regards   
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Offline waterwingz

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #186 on: 10 / June / 2014, 08:52:33 »
Quote from: novsela on 10 / June / 2014, 05:38:44
in this case how shall i handle the 2nd terminal (temperature)? adding resistor ?
Yes.

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create battery similiar to Karmaschinken design ?
Either make something out of wood like he did,  have someone make something with a 3D printer, or buy official Canon AC adapter (or cheap Chinese power supply's) for your camera model and modify them.
http://www.amazon.com/Canon-Adapter-Kit-ACK-DC90-Black/dp/B006Z9ZLEU/ref=pd_sim_sbs_p_3?ie=UTF8&refRID=1BZYV2G1RSWHP1CCBD90
http://www.amazon.com/HQRP-Adapter-ACK-DC90-PowerShot-HS-Digital/dp/B00AE7K6LM/ref=sr_1_71?ie=UTF8&qid=1402404600&sr=8-71&keywords=Canon+A2500+power+supply
http://www.amazon.com/Kapaxen-ACK-DC90-Adapter-Powershot-Digital/dp/B008WY3WKQ/ref=pd_sim_sbs_p_1?ie=UTF8&refRID=1BZYV2G1RSWHP1CCBD90
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Offline novsela

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #187 on: 13 / June / 2014, 10:10:06 »
I have checked the Canon AC Adapter Kit ACK-DC90  and it seems that the temp terminal isnt connected (blank).
I assume it will work without it

Please check the drawing below

Regards

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Offline waterwingz

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #188 on: 13 / June / 2014, 10:18:13 »
Quote from: novsela on 13 / June / 2014, 10:10:06
I have checked the Canon AC Adapter Kit ACK-DC90  and it seems that the temp terminal isnt connected (blank)
That's normal.  None of the external P/S provide a thermistor connected to that input AFAIK.
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Offline reyalp

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Re: Battery third (temp) terminal as multipurpose analogue input
« Reply #189 on: 03 / July / 2018, 00:43:19 »
Here's my Very High Tech implementation of the battery remote on a ACK-DC40 clone dummy battery.

Main point is that (on some cameras at least) it's not too hard to sneak the wire out on the side of the battery. The same approach would work with a real battery, if you masked the original terminal first.

There's more room on the SD card side.

To trigger, you just need to go through a resistor to ground, provided here by the HDMI out.
« Last Edit: 03 / July / 2018, 00:45:06 by reyalp »
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