I got this lamp so we could take a look at it and see if the body detection sensor could be repurposed. (Yes it can!)
These lamps have a different sensing system to the traditional PIR nipple lamps that detect body heat. Whereas the PIR lamps can't detect through walls and glass, these lamps can. This would theoretically allow their use in enclosed outdoor lights to convert them into security lights.
The sensitivity to movement and ability to detect through walls is a bit creepy. You literally can't hide from them. Even the slightest movement in another room will make the lamp light, and I'd guess that pets passing by the house on the outside could also be detected.
The circuitry is really not what I expected though.... The microwave module is pretty much using just one transistor, or possibly a dedicated microwave chip in a 3-pin package. But the main circuitry uses a very common BISS0001 PIR sensor chip, purely for its op-amps, threshold detectors and timers. The RF module is effectively being seen as a PIR sensor by the circuitry. I wasn't expecting that. I was expecting a dedicated control chip.
If you enjoy my videos you can help support the channel with a dollar for coffee, cookies and mysterious RF gadgets at:-
http://www.bigclive.com/coffee.htm
These lamps have a different sensing system to the traditional PIR nipple lamps that detect body heat. Whereas the PIR lamps can't detect through walls and glass, these lamps can. This would theoretically allow their use in enclosed outdoor lights to convert them into security lights.
The sensitivity to movement and ability to detect through walls is a bit creepy. You literally can't hide from them. Even the slightest movement in another room will make the lamp light, and I'd guess that pets passing by the house on the outside could also be detected.
The circuitry is really not what I expected though.... The microwave module is pretty much using just one transistor, or possibly a dedicated microwave chip in a 3-pin package. But the main circuitry uses a very common BISS0001 PIR sensor chip, purely for its op-amps, threshold detectors and timers. The RF module is effectively being seen as a PIR sensor by the circuitry. I wasn't expecting that. I was expecting a dedicated control chip.
If you enjoy my videos you can help support the channel with a dollar for coffee, cookies and mysterious RF gadgets at:-
http://www.bigclive.com/coffee.htm
Huh, kinda surprised it’s 5.8GHz microwave, but at least it’s not 2.4GHz like your oven where it would interfere with things! Or 5GHz
I wonder if putting nail polish or a bit of paint on the photo cell to cover some of it would make the light come on sooner or in a brighter room where light is wanted.
On second thought at microwave frequencies, the doppler change will be in the audio range instead of sub-audio. My radar lamps at home seem to not go through mirrors. I can wave my hand all over a large mirror on a dresser but move away from it and the light picks up.
Just because I said last night I was tired of LED light videos you show me the most high tech 5$ light bulb I have ever seen
If you have ever played with regenerative receivers, you know that they can interfere with other receivers, since they transmit as well as receive. Since they are only a weak oscillator, they can be easily disturbed by stray capacitance and conductors placed near them. I think this is how this circuit works. Think of a metal detector that detects anything that conducts. A grid dip meter is similar a tuned circuit upsets it's grid bias and shows a "grid dip" when the meter is tuned to the circuit under test.
Not work properly
This has been spoken about on other electronics channels of late. I am more convinced that the module just transmits and measures the SWR, uses the BIS0001 to compare the signal. The signal frequency on these units seem to be more around the 3.8Ghz. As pointed out by someone on another channel the single transistor is non linear and can have two voltages present at the same time. The holes are just via's for the ground plane.
The SWR theory makes sense when you find that they don't disturb each other.
Perfect for in the living room when everyone is asleep. Movement outside the house it turn on
How much power does it use when off?
google patents = lost hours
Draws two cars for illustration purposes,
then sais "A motorbike is a good example because of the noise they make" and forgets about the two cars …
But seriously Clive, I love your video's 😀
Isn't that a radar sensor?
How to make it work even in day light ? please guide
One of my favourite tear downs Clive. Keep up the good work.
Do the microwaves work through the opaque or frosted glass that light covers are typically made from? Think I remember seeing the IR ones on an ebay ad say it wouldn't work through the glass. So I'm wondering if one of these could be used instead. I don't really want to remove the glass cover just to have an automatic light.
Is this like sonar
Greetings from LA: Just checked eBay for these lamps and found what look like what you "took to bits" (not a side by side comparison) but I do not recall your mentioning these were AC85-265Volt. Your expose showed a SMPS (or was that a BUCK regulator) inside. I'm a retired elect. tech but miss the diagnosing part of the job. Your videos fill that need (including the occasional accidental overloads ;^) Never seen a capacitive dropper circuit here. Jim