Unfortunately the voltage on the Coolpix circuit is regulated to 8.4v so this will not work with the new camera unless i can change the voltage regulator on the existing circuit easily. If so i could be up and running. I manageed to get a plug for the AC adapter at Maplins (they really are so helpful they opened up 10 packets to find the right one and smiled as they did it!) so now i just need to solder the plug on some wire and we are away. This is proof how uch better canon compacts are for this sort of thing than nikon cameras with their complicated and unnecessarily obstruse proprietary sockets.
However i checked on the coolpix yesterday and it had only taken 13 shots. When i checked on it this morning it had still only taken 13 shots. I had a quick look and a wire had come loose on the switch. I have brought it in to solder the connections.
Which means i need to learn how to solder.
I managed to solve the problem with the A560 with the helf of Microfunguy on the CHDK forum (so much great stuff here i usrge everyone to look) and now it will launch the intervalometer script. The downside is that it will only do so when the camera is turned on via the script of the battery being physically inserted. When the ac adapter is turned on and off to simulate the action of the light detector / timer circuit it needds to be turned on again using the on/off sitch on the camera. This means it is not suitable for this project but it is good to have another one available for future smaller scale projects.
The CHDK is such a great function, and is the other great reason for using canon for these projects. The number of possibilities is amazing!
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