So it takes directly 5v to the dummy battery from usb to the barrel connector.
The mini usb is connected to the same ground and the positive is cut by the switch.
It all works fine but before I could hold the pushbutton down and the camera would keep focus in half shutter and then take the picture on release.
Now when I press the button a picture is taken immediately. Chdk remote setting has always been onepush and normal.
Could this be due to the higher resistance of the cable with all the jack connectors and solder joints? I have measured and it's allways below 1 ohm.
The battery in an SX210 is a standard Canon NB-5L that puts out about 3.7V. If you are feeding +5V in directly to the dummy battery (i.e. your dummy battery does not drop the +5V to ~3.7V) then you might be risking damage to your camera?
I think I follow your description but a wiring diagram (even hand drawn) would probably help confirm that what you have done is correct.
Did you double check that they have not changed - what you describe is the normal action when Control Mode [ Quick ] is selected.
I doubt any cable resistance would cause this. However if the +5V pin on your miniUSB connector does not give a reliable +5V when you close your switch then CHDK might be seeing and "press" and "release". Do you have a volt meter that you can test this with?
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