Hi - I am planning to use a CHDK script for a high altitude balloon flight. I am using a Canon IXUS 115. I used the KAP script and I am getting about 80 minutes on the battery while I need about 3 hours. Can I use this script in the place of the KAP script to get longer battery life?
I had an idea, that there would be a way to measure each action (focusing, writing file, display) directly by it's energy. The advantage is, it would be much clearer what's happening, the experiment would be faster and not rely on completely draining the battery, and tell you cross-over points like when playback mode is worthwhile.
I would start each test the moment the battery voltage changes, let it last 10 units, then stop at the last change. Then use a formula a*x+b*y=10 for two variables and two equations, to solve for the energy used. For example sitting there doing nothing is X and focusing is Y, test1 is doing nothing, test 2 is continually focussing, plug that into B, well you can work it all out. From there, relate battery voltage to capacity used, I"m sure this is well researched and you'll have to find the formula. Probably quite doable if you're good at math.
Apparently you can optimize even further if you use a specific power draw?
These cameras autotest their batteries for short duration peak current ....
I can stop this behaviour by adding a large capacitor to the supply wiring.
I'm planning on a similiar solution combined with an outdoor mounting box project
My A560 uses 2 AA batteries. I removed the contact connection plate on the door (2 screws), replaced the 2 AA cells with shorted empty 'dummies' and soldered wires to the top connectors of the dummy batteries (reverse polarity!!). That removed the door plate as one source of contact resistance and the wired connection is now more reliable using a mains power supply with a backup battery. A wired connection to the camera and large external LiIon battery will be more reliable than internal batteries. 3.2-3.8V is o.k.
I will still try to see if I can locate their current sensing resistor on the board.
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