Poundland's PIR LED tape. Worth buying just for the sensor.

something new from poundland it's a a five pound item and it's a pass infrared triggered usb powered led strip let's get out the packet and take a look at it there's one thing that caught my attention about this that makes it very worthwhile well that's based on what it's like inside and it's the text in the little center itself which says input dc 5 volts to 24 volts so for that money you're actually getting a universal voltage sensor here that could also be used for 12 volt tape but as it is it comes with a little uh usb lead sticky pad presumably for the back of that and some waterproof style led tape is that it that's everything yep i'm not sure it doesn't really say how much you get to this let's measure it i shall do a quick measurement in this if i can get a tape off it tape is off no it's not the tape is not off so it takes off right i shall unravel this so this is the standard 5 volt tape that you can cut it's got a resistor with er with each led and you can cut out every single led position so i shall unroll the whole lot and i'll throw that little rogue led that has made an appearance inside the bench oh they've actually stuck it to the middle of the video right tell you what just goes second one meter two meters two meters of led tape oh that's all right so let's plug this into a usb power supply i'll bring in a poundland usb power supply it seems appropriate and i shall plug in a power analyzer now is this going to have a light sensor in it i'm going to guess that this is based on a biss001 because it's got the little potentiometer at the side that you can actually adjust the uh the delay time of how long it stays on which is quite nice actually because uh many of them don't have that so we'll plug this in here input and we'll plug this here which is the output and i shall put it to its longest setting which is five minutes and i'm guessing from the fact it's not lit that it does have the disk sensor so if i cover this now it is lit and it's drawing 760 milliamps so let's let's do the maths for that 760 milliamps 0.76 times 5 equals 3.8 watts okay that's reasonable enough right let's unplug this and take this unit to bits and see what it's like inside i could see usage for this for uh for the primarily for 12 volt use handy if it does go up to 24 volts though for the led tape because that increases the amount you can run from for a specific current so to open this i'm guessing that it has just held on my little latches here i don't see screws now the question is is it going to have the biss001r is going to be based on the sensor that everything's built in including the timer oh that's odd that is very minimalist oh that's unusual right tell you what uh one moment please i'm just going to take some pictures of this back again with pictures and after a quick kip i don't know if it showed up in the first part of that video but i was just struggling to stay awake i had a quick kip and now i'm back to normal so here's the back of the circuit board it has the input jack for 5 to 24 volts in and that does make sense now and the output jack for the led it has the potentiometer here for setting the time delay and on the back you've got the six solar pins associated with that passive infrared device which is uh well i'll cover that another when i show you the schematic and then there's an ldr solar connections in the back not a lot on the back the circuit board on the front of the circuit board we have the magic we have the pir module and this is a bs612 don't rush to ebay to try and buy them because it's quite a specialist chip and uh i found one listing on aliexpress at 10 pounds per module versus paying five pounds for getting the complete thing with the module built into the circuit board to the support circuitry and two meters of led tape and the usb leads so not the best thing it's not really aimed at at the likes of us that's aimed at manufacturers so there's the ldr and interestingly they've got they can adjust nudge this the value of this resistor to match that ldr so the incoming supply comes in this side we've got the positive we've got two negative connections positive two negative connections out it's got a 7533 voltage regulator 3.3 volt low drop out regulator and i have to say the question current the standby current of this unit is about 40 microamps in in light when the light sensor is illuminated and when it goes darker because that's from a potential divider it drops to about 30 microamps it's not that much the output is switched by this little transistor down here an a09t and there's two positions i wanted so that was to allow for two different pin outs but in reality they're both in parallel so it's designed to actually increase its current carrying capacity or perhaps allow the use of cheaper mosfets but these ones the a09t seem to co-relate to an a03400 which is rated 5.8 amps at 30 volts and with uh when it's turned on but at levels voltage levels this is operator it's got an on state resistance of about 52 milliamps so it's a surprise it's one of those little beefy transistors that can switch tons of current however i always recommend not running them at their full whack what else we got here we've got the potentiometer coming through from the other side and these three pins two pins are bonded together and then we've got a couple of resistors one of them the only resistor in the board that does this it uses the uh code for that that's 100k resistor they could have just written one zero four and that would have been also 100k but they've actually used the 01d is it a code for this one that's it there's really not a lot everything is done in here so let me show you the schematic here is the schematic i shall zoom down a little bit further so it fills more of the available space and i shall put the little module here for reference so the incoming supply comes in on this track and two things happen the pop negative goes straight over to the the mosfet to be switched to the output the positive goes straight out over to the output but the positive also goes to that little dinky voltage regulation in the back and generates the 3.3 volt rail for the circuitry a couple of reasons for that it means that it's a very wide operating voltage range this regulator probably handles up to something like 30 volts it's very low quiescent current so it's not really gonna you know it's never going to really get warm in any way with that load but the fact it regulates even from 5 volts down to 3.3 volts means that this always gets a nice stable supply because if you tried powering something like that from directly from say a 5 volt supply as the leds turned on and off the voltage rail would that would wave it up and down and that would potentially cause instability in this chip so by giving its own dedicated smooth supply it's rock steady 3.3 volts helped by this capacitor here it makes that very stable after that there are two inputs so all the circuitry is contained on this little thing here this is a pyroelectric device if you were to look inside that it would it's got that little window in top they're underneath it's got two little sensors and they react to body heat they're basically they're little like solar panels that react to body heat but they're actually forming a bridge and connected in reverse so it takes if there's a common level of infrared radiation heat hitting them they'll they won't put out any significant difference it's like having two batteries inverse series that will cancel each other out but what happens is if something passes in front of it and then this gets hotter first than this one and then as it passes this cools down and this one gets hot it causes that distinct voltage difference and that's what's detected by a little mosfet inside that triggers that well doesn't trigger it but it basically acts like a variable resistor and that causes a voltage undulation which is detected by the circuitry inside and the reason these little lens is in the front are they're polythene lenses because the polythene is transparent to the in the long wave infrared the heat the body heat the reason they've got all these dimples in them can i can i enhance those dimples oh no i over enhance the dimples uh the reason it's got all those little dimples is because by putting all those lenses in it means as you walk in front of it you this is how the beam shape infrared units as well uh they as you walk past these lenses focus a little sort of blob a little dot that wanders across these displays as you walk past and that causes that's a push-pull effect that fluctuation that differentiates your body from the ambient background temperature and also when you look at the passing thread detectors on like alarm systems or the flood lights you'll notice that the lenses are shaped to actually give them a fan shaped pattern but not look too high not look too low but actually put a shaped beam out or you get ones like this one for ceilings where it basically it detects you from any position in the room complex little things expensive little things to make they have really taken a hit from the radar detectors the little doppler detectors hold on let me grab some little doppler detectors from the pile of junk at the back doppler detectors 10 a penny so much cheaper in this one it's just basically a few capacitors and a transistor and that's kind of really hit the passive infrared industry quite hard i would guess that's going to affect the pricing although each has its own merits the the passing thread can't see through windows but the doppler can that's not great for alarm systems uh but each has its own in merits the advantage is that this is much simpler and you can mount it inside a completely sealed case without worrying about having to have a lens poking through the front the best alarm sensors actually combine passion thread and off-road so if there's a false tripping one it won't actually trigger an alarm unless it sees both responding to different inputs but i digress i have already digressed everything's being done by this little chip and it's got six connections it's got the positive connection negative connection it's got a sense connection which can be varied between the negative rail plus to the positive rail of this chip but if you tie it to the negative rail as it is done in this it makes it is most sensitive and this thing is very very sensitive even without that lens it detects me standing at the bench it has the light sensitive resistor that uh turns off at uh during the day and that has been tuned by the this value of resistor so basically they've used a standard one mega ohm resistor here to act as just a a reference point in in the bridge and then they've packed this up to the point by adjusting this the value of this resistor the fine-tuned point at which this reaches the voltage threshold which will be a fixed voltage threshold that it actually detects day or night for the time delay it's usually a 100k resistor it's using a potentiometer and then it's using this resistor down here just to cap it from going too low too close to the negative rail and that way they can actually set the time delay within two ranges um and again it's just a varying voltage going into that and everything is done inside this chip based on that voltage it's very simple the output shown in the datasheet i shall provide a link to the datasheet down below it's an interesting little thing but not easily available but it normally shows a resistor an output but this having said that they're using a little mosfet here and the mosfet all it sees there it's got a very high impedance it's it's basically it's uh well as the name suggests field effect transistor it's a field between two uh conductive surfaces inside with an insulator between them effectively that actually switches using a field it's actually like a little dam but it's pushing electrons down out the way like a little tap but with no current flowing as such it's very very clever little devices mosfets very very freaky but very clever so this thing does it works fine at 5 volts up to 24 volts the only point is going to cause a problem is if you get too close to the 3.3 volts this thing won't be able to regulate and you'll end up with any fluctuations in the power lines will result in that ripple which will keep re-triggering it this is a common problem with these devices from the voltage drops drops too low in battery operated systems once it reaches a certain level they'll just keep re-triggering until the battery is uh but there we go there's not much else to say about it it does operate from five to 24 volts and as such this little thing from poundland for your five pounds is a very very useful little sensor in a nice little case um that let's see how how does this go in it goes in like yeah yeah i'll try and put that together again later but it's a nice sensor in a nice case i should put the dominant that just takes standard jack input and output you're getting this standard usb lead i'm guessing it'll be fairly high current-ish cables because it can handle a decent current i will say i tested the led tape it works out about half a half an amp a meter if you power it directly from five volts that might be because from a beefy supply and there was no resistance in series with of cables the tape itself is basically speaking uh cuttable every led and there's one one led and 150 ohm resistor and series with all the way along but this can be cut on these copper pads to any length you desire and then you can reuse for every cutoff now to prove that it operates at 12 volts that'd be quite a good thing to do let's get this out of the way let's get the doodles out the way let's uh zoom back out to get a larger filled up view let's bring in some led nine yes that's going to upset the real neon people because they don't like it being called ledinium they want to claim that neon is neon which is reasonable but uh led linear light strip is what we'll call it then so let's plug this into the output marked led let's set this to its uh minimum delay i think it was there and plug in a cheapy chinese dangerous goodness knows what electrical separation there is inside this sensor and i shall plug this in and it lights up and then it goes out but it's not going to trigger again because uh there is ambient light so i shall turn the light off is that going to be enough that it's going to trigger now no it's actually oh no it's trigger now and if i stay still enough it should go off after 10 seconds because i think i set that to 10 second setting if i didn't it'll keep you triggering is it going to go off this is like watching paint dry not sure it might be detecting it's super sensitive it might just be detecting my my bumping gums my mouth just blabbing away here i'll try at the opposite end of the scale i could try covering it uh no this is one of these moments i feel awkward because it feels like it's not gonna go off right it's not gonna go off is it okay right out the light is coming back it's pointless uh trying to record motion detectors when you're actually in front of it is is just a terrible thing just for reference which way would that have been to adjust it to the 10 seconds that is in the 10 second i think i did test it is 10 seconds i didn't test the 5 minute setting but it does certainly it times out after about 11 seconds but there we go it's pretty good it's well worth the money if you want just this module on its own it represents very good value for that but you also get the little roll of a low voltage cold white led tape too so i'd say that's a win

Channel: bigclivedotcom

Views: 734,804

Rating: 4.8950448 out of 5

Keywords: poundland, led, tape, PIR, sensor, usb, schematic

Id: yVdsiXrCBlw

Length: 17min 4sec (1024 seconds)

Published: Sat Dec 12 2020

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From the description:

"""

Poundland has had USB powered LED tape in the past, but this new version has an inline PIR sensor with standard power jacks on either side. The bit that really caught my attention was the wide voltage range of the sensor, making it suitable for 5V, 12V and 24V applications.

Here's a link to a datasheet for the unusual BS612 integrated PIR sensor:- http://www.image.micros.com.pl/_dane_...

Although everything is integrated into a 6-pin PIR package, it still allows adjustment of the dusk level and time delay.

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