What about the lens extending and retracting? If you shut off power, the lens can't retract. But when you power back up, it may do a full retract/extend cycle.
Quote from: peabody on 10 / March / 2009, 11:19:07What about the lens extending and retracting? If you shut off power, the lens can't retract. But when you power back up, it may do a full retract/extend cycle.That's exactly what happens. I think the retract and extend cycle is used by the camera to determine a datum of lens position for zoom / focus. For that reason I expect it'll be very difficult to circumvent. I think trying to implement / exploit a low power mode in the camera may be a better approach.
Is there a way in CHDK to set the zoom and focus (i.e. always at it's widest angle and focused to infinity)? I am trying to make a remote device that will take a picture every 3 hours for a month. Power is the big problem, so making the camera shut down between shots is ideal. Anyone have insights?
well, certain cameras have a "wake-up on USB signal" which should help.See the last column of this page:CameraFeatures - CHDK Wiki
I am looking for the same functionality for an A530.
The availability of this feature depends on the camera's hw design, it's not a setting you can change. Cameras known to wake up on USB connection are: S1IS, S2IS, S3IS, S80. All these cameras have an always working low-power auxiliary CPU (subCPU) that also makes their time lapse feature possible.The PowerShot N also wakes up on USB connection. No other models with USB wake up are known.
The PowerShot N also wakes up on USB connection.
To clarify slightly, applying +5V to the Powershot N's USB power pins is not enough to cause the camera to power up. However, plugging its USB cable it into a USB "master" like a PC does wake it up. As the camera's battery is charged via the USB port, that suggests the application of 5V causes some kind of "wake-up" and the Canon firmware then looks for a host on the data lines. If it does not see anything there, it powers down.
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