There seem to be a modestly wide range of these lamps available on ebay, so it's worth taking a look inside one to see how it works.
The most notable features are the use of a standard 3W LED driver with a simple resistor and zener based dropper to give a stable 5V supply to the electronics, both in standby mode when the 3W PSU puts out an open circuit voltage of 15V and when the LED array is lit and the voltage drops to 9V. The sensing circuitry is based on the very common BIS0001 or BISS0001 PIR controller with its usual support citcuitry.
This item was another part of the goody bag sent over from China by Judd (an Australian living in China) so I'll provide a link to his Alibaba store. Although I'm not sure he has these on it.
http://anboge.en.alibaba.com/
The most notable features are the use of a standard 3W LED driver with a simple resistor and zener based dropper to give a stable 5V supply to the electronics, both in standby mode when the 3W PSU puts out an open circuit voltage of 15V and when the LED array is lit and the voltage drops to 9V. The sensing circuitry is based on the very common BIS0001 or BISS0001 PIR controller with its usual support citcuitry.
This item was another part of the goody bag sent over from China by Judd (an Australian living in China) so I'll provide a link to his Alibaba store. Although I'm not sure he has these on it.
http://anboge.en.alibaba.com/
Can you connect capacitor between PIR and LED to add fade in and fade out..?
"BISS0001" actually
how much current it draws when idle I mean when the PIR is not detecting motion? also is it safe to keep this bulb always ON so it gets turned off only by PIR and the circuit inside will permanently connected to AC power?
does that light sensor go by a particular name as I need a light sensor for my battery operated light as one of the light sensors pins has broke right where it enters the resin, thanks
Clive, I want to get a plug-in power meter like you use. I found yours, it's the Eco Eye. I guess you would recommend it? I can get that for £15 on Amazon. They also have a unit for £25 which reviews say is a Prodigit 2000MU (has also been sold in the past by Maplin – maybe still is), which according to the datasheet has accuracy of 0.5% which sounds very good. Though not necessarily super important. And I do want one that measures in 0.1W increments as yours does, and I think the Prodigit is nearest 1W. Would you buy your Eco Eye again if you needed another, or is there any reason to upgrade? Thanks again for all your great work.
lol death daptor
The assembly quality is ghastly.
Love your work Clive!
can you do a video about how these motion sensors work?
Please stop pointing with your middle finger. It is rude
Hi Clive
I have discovered a very interesting LED "work light" sold here in Sweden that I'm willing to send to you. What's interesting about it is that someone at the factory cheated in production. The light runs on 3 x 1,5V batteries and uses 24 high intensity white 5mm LED. On the PCB, ALL of the LED's are in parallel. That means that if you drive them in 20mA each, you should end up with 24×0.02=480mA. That should also mean that you need a 1,9ohm resistor. That also mean that you would need a 0.5W resistor. Fun part is that they don't. Instead they use a 0804 SMD resistor which both of us know can never handle close to 0.5W. So what they did is SKIP the resistor and connect the battery leads directly to the LED's hence feeding them with 1A+. When measuring, its also clear that they draw nearly 1.1A from the batteries and also get very hot.
So as I said, someone in production probably discovered that the SMD resistor burnt out, hence skipped it and hoped that the batteries would just dwindle down to a safe level after a while when the batteries run out.
If you are interested in doing a video of how production cheats on lights, I can send you a couple for you to try out.
I have now rebuild them since the design is fairly smart and flexible and run them from a external power supply on 3V which works perfectly since for some reason the Vf on them still work on lower than the traditional 3.6V which is standard.
Contact me on johan@acquris.se and send an address so I can send them to you. I also home some dimmable LED lamp with a very different design here in Sweden if you are interested in looking at them too.
Rgds
Johan from Sweden