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switch powered by PoE? passive injector backwards?
For what it's worth, I got this 4-port PoE-powered switch: 10/100M 4 Ports PoE Extender Up to For Network AP IP Camera Telephone Equipment | eBay and it works as expected. They also sell a 1-port version of this, called "1-port PoE extender" which can be stacked in series up to 4 units with... -
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didn't get around to it?
Came across this article today. He's obviously high-profile, he's been targeted three times, but didn't get cameras before and he won't say if he's installed since. Trying to imagine what "safety reason" there could be to pretend you do not have cameras, if you actually do? Burglary... -
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switch powered by PoE? passive injector backwards?
As usual, Nayr had the exact answer I was looking for, the 4-port PoE splitter. This is just what I had in mind: Amazon.com: UHPPOTE 10/100M 4 Ports PoE Extender Up to For Network AP IP Camera Telephone Equipment: Home Audio & Theater (apparently also available on aliexpress etc.) Since I'm... -
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switch powered by PoE? passive injector backwards?
I want to put a 5-port switch in a garden shed so I can have several cameras around there without needing to run four separate cables all the way to the house. However, the shed is unpowered, so all the power has to come from the house. Each camera uses under 3 W, so the total power... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
On one of my cameras, I carefully scraped off as much as I could of the glue bead around the window, then heated the case up with a heat gun and was able to pop the window out in one piece by pressing on the front with a dowel of the right size. The second camera I got more impatient, didn't... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
If anyone else is playing this game- I decided I didn't really like the 16mm lens I used before. I had two samples, but both were a bit blurry, especially towards the left side. So I got a different lens from Ebay: HD 5mp 16mm lens IR Board CCTV Lens M12x0.5 MTV view 50m for Security IP Camera ... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
If you have the HDW4431 camera like mine, which is available stock only with wide-angle lenses, I assume you replaced the stock lens with a 12mm, 16mm or longer lens? If so, your image looks typical of what you get when the lens is focused at short range, close to the camera. The wider lenses... -
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adjust exposure compensation (bias for faster shutter)?
Is it possible to set an autoexposure bias, such that auto-exposure still works, but the image is X amount darker than usual, so you get the advantage of a faster shutter speed? This is a standard feature on still cameras, but I'm not sure if it's available on the Dahua controls. I see... -
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This thing under the lens ?
Light sensor. On many Dahua cameras the light sensor threshold level and delay time is configurable through software. On mine you have to wait 5 or 6 seconds after blocking off the sensor, before it switches, so a sudden flash of light or shadow won't affect it. You can also force it in... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
Mostly a note to myself for later. I like to adjust camera settings remotely from a script so I can set based on the exact time of sunrise/sunset. The Dahua IPC-HDW4431C-A-V2 camera (and I guess most of their line) has three register banks for exposure settings: "Normal", "Day", "Night" plus a... -
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Dedicated License Plate Cam project
That distance and angle is great if your situation allows; but if you have to go to longer ranges for a good angle, you can still make it work. -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
If you mean the $65 4MP Dahua, I've ordered twice and both times it came in 3 days. If you're talking about the 16mm lens on ebay, I ordered them April 23 and got them on May 6. Note the lenses I received have no markings at all, and do not match the photo on that ebay listing, so your mileage... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
Update, I got a second camera of the same kind and installed a 16mm lens on this one. It does fit inside the case, with a few mm to spare. There is no guarantee you get the same thing on an ebay reorder, but the lens I used was from this link: 2X HD 5mp 16mm cctv lens IR Board 1/2.5" M12x0.5... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
I have not used the 16mm on this specific model, only on another camera. The shorter focal length may enable it to fit inside without modifications, but I am not sure. I can tell you the 25mm is good for getting detail on vehicles. Here is a crop from a 1920x1080 video frame where the... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
This camera, and most other small security cameras, dashcams, and action cams use M12 type lenses (aka M12x0.5 or S-Mount or "board camera" lens.) The factory lens has a blob of clear material like 5-minute epoxy on the threads, holding it in place. I used needle-nosed pliers to shred it off... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
The ebay $65 Dahua IPC-HDW4431C-A offers several choices for control of the IR light: under "Setup - Camera - Conditions - IR Light" are three options: a manual power level control you adjust to your preference; a "Smart" IR which automatically turns down the light if someone approaches close... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
I have a 2MP Dahua "Eco Starlight" varifocal IPC-HDW5231R-Z from BEC Technology on aliexpress, as well as the 4MP IPC-HDW4431C-A from ebay. I have tested both of them at 1920x1080 resolution, looking at the same area. In both cases the camera's internal IR illuminator was turned off because I... -
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Next best thing under 100$ to Starlight Varifocal Turret (IPC-HDW5231R-Z)
I got the Dahua IPC-HDW4431C-A from ebay seller "monitech_cctv". Firmware is non-upgradable but that's the only drawback I see. Price is better than for the other similar options. I took mine apart and replaced the 2.8mm lens with a 25mm for ALPR use (to make it fit, I had to remove the... -
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Dedicated License Plate Cam project
Just started with this- in a while I could put up a Python example. Right now I've got an Ubuntu box running this modified version of the "Darknet" recognizer GitHub - saiprabhakar/darknet-modified at v0 in batch mode that spits out a file with (detection, probability, x1,y1,x2,y2) data for... -
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Dedicated License Plate Cam project
I haven't wanted to run the screaming beast of a machine capable of real-time ALPR. So far, I've got a simple motion-detecting Python / OpenCV program that takes a 1920x1080 stream at 15 fps, and downsamples that to a tiny frame (just 88 pixels across) to do "Optical Flow" motion detection... -
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when your RJ45 connector gets wet
May depend on local pollution levels- I'm living in a city so there's plenty of stuff in the air that probably makes the rainwater pretty conductive. Lots of pollen around, as well. My connector was horizontal, instead of straight down. And if you use a separate +12V dc connector for power...- cam235
- Post #6
- Forum: Installation Pics
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when your RJ45 connector gets wet
Camera is 4MP Hikvision DS-2CD2542FWD-IS. Cut off the jack and had a look, just a black mess inside and pin 3 had actually corroded through. Replaced it with new jack, and it's working again. If anyone else has this particular cable, the ordering (pins 1-8) is 1=Orange, Yellow, Green, Grey...- cam235
- Post #4
- Forum: Installation Pics
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when your RJ45 connector gets wet
Impressive what can happen when your PoE connection gets wet for about a day. Looks like the third conductor down from the top is half etched away from the PoE voltage. This pic was after I cleaned it up with alcohol and a q-tip, before the area was all black. This was a casual install just as...- cam235
- Thread
- damage poe water
- Replies: 11
- Forum: Installation Pics
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Hikvision HTTP command to change exposure?
I have a Hikvision DS-2CD2542FWD-IS (4MP mini-dome) and I know there are some things you can read out and control via HTTP commands. For example, you can get the current motion detection setting with curl http://user:password@ipaddress/MotionDetection/1 >resp.xml and if you modify the... -
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Dedicated License Plate Cam project
It's near the roofline, just under the eaves. If you're walking by on the sidewalk or even up the driveway, I don't think it really jumps out at you. I had to increase the camera exposure to make it visible with the black wrap on; from any distance mostly it just looks like a dark blob. -
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Dedicated License Plate Cam project
Here are some photos of my current setup, the Nikon SLR lens on the Dahua box cam using F-mount to C-mount adaptor. In background of one photo is a homebrew IR spotlight. After installing I put "black wrap" foil around the lens hood and camera body, to keep some dust off and make the white... -
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Dedicated License Plate Cam project
Don't have a photo of the Nikon handy, but first I tried a Canon 100mm SLR lens which was actually larger than the Nikon is. Photo of that lens on the camera is here: https://ipcamtalk.com/attachments/dahua-canon100mm-jpg.12858/ -
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Dedicated License Plate Cam project
This is the same camera that I put a photo from here: ALPR: anyone have a 100mm lens they like? It is good enough for a clear view of plates at 250 ft. Often you can even read the smaller print on the frame of the plate. -
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Dedicated License Plate Cam project
Reposted here my answer to a private message about my use of a long SLR lens, in case it is useful to others. For extended range (plates at 200+ feet) I am using a fully manual old-style Nikon SLR lens, no auto iris, no auto-focus and that is what I recommend. Also needs F-mount to C-mount...