The usb cable lengths I would be using far exceed the passive distances
-On another matter my understanding is that chdk will reside on the sdhc cards (4gb ordered earlier today) and no pc will be needed - am I right?
Slightly wide of the topic, but I recently purchased a bunch of these to allow me to power some USB powered microcontrollers from a single 5V supply while also allowing me to access the USB data lines. They might work for your situation too, you could switch all of the +5v lines on at once using a power adapter in to the PCB, and a bunch of hacked USB cables out, with a single relay or switch to enable the 5V to the 24 cameras. Using an off the shelf PCB keeps things a lot tidier than the clutter of electrical tape and pudding joints I often end up with. Using a microcontroller's GPIO pins would be an alternative, as it would allow you to do things like fire all at once, or fire cameras in a very tightly controlled sequence, by toggling the gpio pins at set intervals, but that is a whole new topic.
..I have found that the usb firing method works ok on a few cameras hubbed together but still I am still amassing power supplies to complete the array. (batteries would be a big hasssle methinks)The prospect of physically removing and downloading images from the sd cards has been a dark spot and you have provided light on the matter.Now i have to figure out what you said and implement this great idea of yours So I ordered up 60 of these and will have to reconfigure the plan to accomadate those micro usb ports etcCould you do a wee sketch? please and thanks for instance where the usb wires both i and o go to camera and back to hub I haven't got my head around the wiring nor the chdk caveat the usb data is not available if remote is enabled
Meantime, perhaps one of the developers could answer this question. Can the remote be enabled and disabled in a script, and if so, would this permit the use of USB for data when disabled? In other words, could the script start, enable the remote, take pictures, then once one or more pictures are taken, disable the remote function and at that point, re-enumerate the USB so the host can download the pictures?
so that's great as it seems as though dual use of the usb is doablefantastic
Quote from: ahull on 21 / May / 2016, 19:47:22Meantime, perhaps one of the developers could answer this question. Can the remote be enabled and disabled in a script, and if so, would this permit the use of USB for data when disabled? In other words, could the script start, enable the remote, take pictures, then once one or more pictures are taken, disable the remote function and at that point, re-enumerate the USB so the host can download the pictures?see usb_force_active()
usb_force_active(mode) Forces the Canon firmware to see the USB 5V line as active regardless of its actual state. mode = 1 or true for USB 5V power detect forced active mode = 0 or false for USB 5V power detect normal This function useful in multicam scripts that need to maintain PTP communications while the USB 5V line is switched on & off for USB remote shooting - particularly for precision sync. Returns true if function is implemented, false otherwise. Note : this function requires the CAM_ALLOWS_USB_PORT_FORCING option to be selected in the platform_camera.h build configuration file for the camera.
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