UI Upgrade: CHDK adds many other features to old cameras. CHDK runs the script when I press the camera’s shutter, and then it is happy to accept remote commands. This was solved by writing a script with some mode commands I found on a forum. My camera and chdkptp could now connect, but I still couldn’t actually take a photo. (This works only on a per-session basis if you want to permanently disable the helper, you’ll have to edit some deep configuration files.) The simplest solution was to find the offending process using a “ps -ax | grep gphoto2” command, and “kill -9” it.
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The first was that chdkptp couldn’t connect to the S80-a helper process on the Pi was grabbing the connection, assuming I wanted to download photos. I ran into two problems, which were resolved after searches of CHDK’s user forums. One of the nice things about chdkptp is that a precompiled binary, bundled with required supporting libraries, is available for the Raspberry Pi, thus eliminating dependency hell.
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A number of programs can use this PTP standard, including chdkptp, which offers both a command line version and a graphical user interface (GUI) version that lets you see what is being displayed in the viewfinder screen live. Launching CHDK on my camera just requires putting the prepared card in and pressing the S80’s “shortcut” button.ĬHDK provides an interface for remote control of the camera via the USB link normally used to download photographs directly to a PC.
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Only the 1.00g version is compatible with CHDK, so I followed the instructions to upgrade the factory firmware, the biggest obstacle to which was finding the right utility software to open the 7z format that the firmware file was compressed with.Ī cross-platform tool called Stick makes finishing the CHDK install easy: Drop a photo taken with a camera onto the tool’s interface and it analyzes the metadata and downloads the exact version of CHDK required onto a SD card. Looking up the instructions for my S80, I determined its current firmware, which turned out to be 1.00f. Fortunately, this is one of those rare pieces of open-source software for which the documentation is a comprehensive and intelligible wiki. I had three batteries, one of which refused to charge at all, and two others I no longer trusted for a long-duration experiment, so I found a DC adapter on eBay that powers the camera from a wall socket. The only problem was on the battery side.
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It’s a credit to Canon that despite years of disuse, all the parts sprang to life. At dusk, however, the lighting on and around the building changes more dramatically, so I wanted photos taken at a faster rate. During the day, the light changes slowly, so I wanted to shoot one photo every few minutes. CHDK provides a script that allows a more fine-grained increment of 1 second, but I wanted to try time-lapse photography of the Empire State Building, which we happen to have a good view of from Spectrum’s New York office. My S80’s original firmware had a function that would take a photograph at fixed intervals of between 1 and 60 minutes, in 1-minute increments.
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