Hi. In a previous video, I Took a look at the Raspberry Pi 2 here and how it was susceptible to the photo flash from a typical camera like this one these high intensity is then on flashes. the power chip on here. this tiny little thing down in here was like a bear flip chip die and you could actually the high intensity photo flash in possibly the UV from this actually penetrated the chip itself and cause the whole Raspberry Pi to reset and it was a big problem and everyone made a big thing about it.

But I just got one of these new fangled around a three by threes and I thought well have they fixed the problem because I haven't heard anything about it now. The power circuitry around here looks already down close to identical I think it is, but the chip I'll show you a close up in a second. They've actually changed the chip on here. Still, it's still a flip die like this with the balls on the bottom, but the top looks to be coated in some sort of black material or something like that.

So possibly they've fixed that on this thing because they were well aware of the problem. But anyway, decide to flip the new Raspberry Pi 3 over and of course the new functionality on the Raspberry Pi 3 as well as being a bit faster and everything else. Um, it actually has Wi-Fi and Bluetooth integrated on here and look, what's on the bottom? a bear die yet again for the Wi-Fi chip said uh huh, Is this one photosensitive as well? Let's take a quick look at the Raspberry Pi 2. Again, have a look at the culprit down here.

In there it is smack in the middle you sixteen there you can see that is a bare silicon die. Now let's take a look at the one on the Raspberry Pi 3. There you go, you can see it is significantly different. It's got this black sort of coating on the top.

I Mean it's still bare die around the outside by the looks of it. but they have put a coating on the top of this thing so there was much theory about how the light was actually penetrating and one of them was it can. The UV can actually penetrate directly through the dye itself. So maybe just putting that coating on the back is enough.

but they've got a deal. Went over here. by the way, this is for the this looks like ESD protection. anyway.

I Don't believe that one's photosensitive, but on the back of the new Raspberry Pi 3 here it is there it is Broadcom BCM 43, 4, 3, 8 that's combined Wi-Fi and bluetooth chipset and you can see Bairdi you can see those brush marks right across the back of the die. So uh-huh and that's a big-ass die. -. All right let's try and photo flash the original wire power supply u16 in there and let's see if we can get the reset problem that we actually got before.

So I'll get right up. Its clacker here and can't get much closer than that. And yep, still susceptible. Look at that wah-wah-wah let's try that again.

I 15 centimeters away? maybe? No, it's alright. You really have to get right up. its clacker. Let's see if I can duplicate that and I'm sort of an angle as well.

No, no, couldn't get it this time. but you saw it. I got it the first time. That was my first ever attempt to know.

Yep, there we go. You really have to get close. it was. so it is much improved.

from the Raspberry Pi to where you know you could get it from like half a meter away. Sometimes let's see if we can flush the Wi-Fi chipset on there. I've got it connected via route Wi-Fi At the moment you can see there's no ethernet connected and I'm playing my previous video so hopefully it should stop or freeze or anything if we do something to that. Wi-Fi chipset.

Try it again. Nuts to Appliance. Come on there We go flash and still going. Is it no? Nope, No.

I Think we have killed our internet connection Google.com Nope, it's not that slow. Bingo One flash. Granted, we were very, very close to that and it appears that you do have to be quite close to it, but hey, it's still susceptible. You really have to get quite close to it in order to flash it.

There we go: I Think we're yep, we've killed it. We've killed it again. So you've got to be like for this particular camera: this particular photo. flash intensity.

whatever it is I don't know it might be variable depends on the current camera settings or whatever, but it's still susceptible. And of course, it doesn't lock up the CPU the CPU still work so I can still do stuff. I can go in here and I can load up my you know, load up, boink, or do whatever that I've got this thing doing and I can do that, but it just it kills. The internet connection kills the Wi-Fi connection on this thing.

probably kills Bluetooth as well because it's the integrated Bluetooth chipset, so almost certainly kills that as well. But of course, the thing is the chips on the bottom of the ball, so it's less susceptible. If you have it sitting down like this, the light would have to reflect back under the board and it depends. Yeah, and it doesn't sit completely flush because it's got pins sticking out things like that.

so there's maybe enough gap under there. so we'll try that. will just get maybe you've got to use something a reflective. This mats not probably good enough, but I can just use some white paper under there like that.

We'll see if we can flush it that way. Alright, let's give it a go. It's under this corner here, so we'll try and sort of get some reflected light back down like that. Alright, let's give it another flash just for good measure.

and can we jump forward on our video? Yep, no worries, we haven't killed it. So the odds of reflecting under their boredom? practically zero. I Think so I Thought: I'd Just check to see if there's any extra latch up current. When the Wi-Fi chip set gets flashed, it's drawing like that.

roughly 2 watts or thereabout should I 0.4 Answer: So before and let's try afterwards and that's afterwards. Note: There's no SCR latch up in the chip so it's not going to blow up or you know, pull excess current and destroy itself or anything like that. So that's just fine. So there you have it.

there are three. Pi/3 is still susceptible to this photo flash problem. Here's an article on the Raspberry Pi blog itself from like almost a year and a half ago now explaining what the photo fresh problem is and Peter Onion originally found it and showing the current waveforms and the latch up and the bare die and you know everything else and how the photo flake you know and links to videos of how photons over a certain energy can penetrate the dye and everything else. and they've been well aware of this yet.

They haven't fixed the problem, although it looks like they might have attempted to because that U16, a voltage regulator chip is now looks like it has some sort of black coating on it or something like that, but it's still effectively the same package and it's still susceptible. Not as bad as the Raspberry Pi 2. Granted, you have to get really up close so using the Zaca same camera had before, so that's much less susceptible, but it's also susceptible to the Wi-Fi as well. I Have not done extensive tests to actually get the exact distance and things like that with different cameras, so I'll leave it up to other people to I do that or Raspberry Pi to investigate themselves, but you can lock up the Wi-Fi and presumably the Bluetooth as well with the same issue so they didn't go wah-wah-wah I Hope you enjoyed that.

Catch you next time! Hi! how many of you have one of these lying around? a Raspberry Pi Hey, it's a cool little Linux computer, you know, and it's SuperDuper cheap, but there's probably a lot of these lying around doing nothing, just going to waste. So I thought that was a bit of a shame. So I thought hmm I've got a couple of these lying around the lab. What can I do with them? Can I do anything useful I Know: let's look for aliens.

Why? Because aliens.