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by emma1997
Fri May 22, 2020 10:26 pm
Forum: Beginners
Topic: Re: insect motion sensor
Replies: 5
Views: 166

Re: insect motion sensor

Firstly, to the TCRT5000 sensor. I've had a quick look at this and it's range is only 25mm. Did you find this range enough? Did you use quite a few of them? I take it they reflect light back off the surface of small objects? This might be worth a try if I have a few of them maybe? 25mm is worse cas...
by emma1997
Fri May 22, 2020 6:52 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 571

Re: RPi4-4GB: How easy to blow up the USB chip?

lol. On cold dry winter days I like to get charged up and case my other half (and kids too way back when) around the house laughing and screaming. Besides the cardio and heating bill savings, just plain huge fun.
by emma1997
Fri May 22, 2020 6:29 pm
Forum: Troubleshooting
Topic: VLC UI too big on screen
Replies: 2
Views: 212

Re: VLC UI too big on screen

I agree this is probably the biggest remaining issue with rendering bugs improved lately. Makes it impossible to use settings menus w/o going through the tortuous screen configuration utility (and back). Sometimes not even possible to do that and just reboot. It's like they have never found a way to...
by emma1997
Fri May 22, 2020 6:04 pm
Forum: General discussion
Topic: 110V DC for USB-C Power Supply for Raspberry Pi 4
Replies: 17
Views: 502

Re: 110V DC for USB-C Power Supply for Raspberry Pi 4

Most power supplies these days don't care whether input is AC or DC. As part of characterization/testing I found that, although minimum spec was 80v-85v, most worked down to about half that. Depending on bridge caps and source grunt they took double or even triple voltage too. Amazing how accommodat...
by emma1997
Fri May 22, 2020 5:29 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 571

Re: RPi4-4GB: How easy to blow up the USB chip?

Flat and thin and not very robust on mine. Floating and not fastened down and more flimsy than the regular USB2 pads. Maybe due to cheap chinese cutting corners or part of the USB3 mechanical spec IDK. One or two pins in the upper row were bent slightly out of place on the ones I was able to repair....
by emma1997
Fri May 22, 2020 5:22 pm
Forum: Beginners
Topic: Re: insect motion sensor
Replies: 5
Views: 166

Re: insect motion sensor

I've had great success using simple IR sensor to detect carpenter ants. TCRT5000 is used at several locations. Cheap, reliable, and convenient because TX and RX are both built in. I'm sure discrete phototransistor and LED would work just as well. No other components required assuming internal pin pu...
by emma1997
Thu May 21, 2020 10:10 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 571

Re: RPi4-4GB: How easy to blow up the USB chip?

it's very unlikely that an electrical fault will blow up a USB3.0 port unless it's incredibly severe. It's more likely that whatever connector is being pushed into the slot is somehow damaging the superspeed data pins. I came to the same conclusion. Over the years had a handful of failures on PC po...
by emma1997
Thu May 21, 2020 9:45 pm
Forum: Beginners
Topic: Best way to share keyboard and mouse between Pi and PC
Replies: 17
Views: 448

Re: Best way to share keyboard and mouse between Pi and PC

At the other end of the spectrum is a ten cent DPDT slide switch. Out of several setups with Pi sharing a PC half use that and a couple with relay, button, and IR remote sensor. Both methods depend on using a keyboard/mouse USB dongle. Logitech being the most reliable with Unifying feature to allow ...
by emma1997
Tue May 19, 2020 4:40 am
Forum: Raspbian
Topic: VLC hard crashes
Replies: 80
Views: 11841

Re: VLC hard crashes

I admit to having only basic understanding of that MMAL/background issue and your more detailed description is appreciated. As mentioned I was aware some of those decoders don't work. Just not being privy to Raspbian distribution infrastructure, surprised they are included if they are known not to f...
by emma1997
Tue May 19, 2020 4:15 am
Forum: Off topic discussion
Topic: DIY Non Contact Hand Sanitizer Dispenser
Replies: 8
Views: 462

Re: DIY Non Contact Hand Sanitizer Dispenser

Yes, I see. It's true that the next person will be disinfecting themselves. However they may not do it right, get interrupted, or the agents may not be 100.00% effective so still not a risk I take. Maybe I will pull out some of those alcohol wipes at the market but still don't like anything hundreds...
by emma1997
Tue May 19, 2020 2:17 am
Forum: Advanced users
Topic: One power plug to rule them all?
Replies: 15
Views: 709

Re: One power plug to rule them all?

Curious, that LM unit seems fairly large! How does it stack up against the unit I listed above, which seems much smaller! Same thing, conceptually? https://www.digikey.ca/product-detail/en/recom-power/RPM5-0-3-0/945-3254-1-ND/9644704 Yes, same function. But at more than 10x the cost (maybe 30x w/s&...
by emma1997
Tue May 19, 2020 12:52 am
Forum: General discussion
Topic: Capacitor tester
Replies: 8
Views: 359

Re: Capacitor tester

I suspect it would be possible to build a cap tester using Pi with nothing else but a push button. Use GPIO pin that has pullup. Discharge cap by shorting to ground then see how long it takes to change state. I did this many years ago on an 8088/8155 SBC that I designed and sold. Not particularly ac...
by emma1997
Tue May 19, 2020 12:34 am
Forum: General discussion
Topic: Rpi solar power :)
Replies: 17
Views: 627

Re: Rpi solar power :)

Probably means dig a hole and cover with about 1/2" of soil so many new powerpacks will come up in the spring. Cheaper even than buying on Ebay.

The solar part refers to energy from the sun needed for healthy growth of all chlorophyll based organisms. Once they sprout that is. lol
by emma1997
Tue May 19, 2020 12:30 am
Forum: Off topic discussion
Topic: DIY Non Contact Hand Sanitizer Dispenser
Replies: 8
Views: 462

Re: DIY Non Contact Hand Sanitizer Dispenser

Not really. If you touch the pump to pump some of the disinfectant onto your hands and then use that disinfectant, and germs contracted by touching the pump are then killed immediately... I disagree. Specially a bottle like Purell but also wall mounted. In most cases a person dispenses with contami...
by emma1997
Sat May 16, 2020 12:36 am
Forum: Troubleshooting
Topic: Pis power supply specific/selective ?
Replies: 29
Views: 631

Re: Pis power supply specific/selective ?

Green = Data + White = Data - Black = Volts - Red = Volts + Silver = Ground Imperf3kt was right. there is no V- here. Black and silver are the same. Only difference is black (signal ground) is connected both ends while silver (shield ground) should only be connected at one end. Not always observed....
by emma1997
Fri May 15, 2020 11:41 pm
Forum: General discussion
Topic: Pi3 overheating: would Pi4 be cooler?
Replies: 20
Views: 737

Re: Pi3 overheating: would Pi4 be cooler?

i had an original Pi3 when it came out and ran so hot it got shelved never to be used again. A museum piece. Then Pi3b+ arrived and was much much cooler. Now similar heat issues with Pi4B but after upgrades big improvements. In fact after a thread here on shutting off unwanted items and other tricks...
by emma1997
Fri May 15, 2020 11:23 pm
Forum: Troubleshooting
Topic: RPi4 error booting w/ external data hdd
Replies: 38
Views: 949

Re: RPi4 error booting w/ external data hdd

You're right, even though the subject was originally mentioned here, it has drifted slightly so I'll make one last comment and go away. 8 years ago I plugged in a second HD (g:), an SD reader (j:), and some disc burners (v:-z:). Ever since they have keep same drive letters regardless of how many oth...
by emma1997
Fri May 15, 2020 10:56 pm
Forum: Advanced users
Topic: One power plug to rule them all?
Replies: 15
Views: 709

Re: One power plug to rule them all?

Thanks Emma. Just so I understand, you're proposing running one step-down converter to use for both the Pi and the Relay board? And to just power the pumps straight from the PSU? Exactly. Unless you have extremely large and noisy relays or motors, which does not seem to be the case, then running th...
by emma1997
Fri May 15, 2020 10:09 pm
Forum: Troubleshooting
Topic: RPi4 error booting w/ external data hdd
Replies: 38
Views: 949

Re: RPi4 error booting w/ external data hdd

You seem to be confusing drive letters and disk numbers. Not likely. More than appliance user starting with Win3.0 and DOS as far back as 1.10 (when CPM reigned king) up through 95/98 etc and finally settling on XP. Admittedly not such an expert starting with Vista, 7, 8, and 10 because I don't lik...
by emma1997
Fri May 15, 2020 6:35 pm
Forum: Raspbian
Topic: VLC hard crashes
Replies: 80
Views: 11841

Re: VLC hard crashes

Quick update: with fresh SD installed/upgraded I still get the occasional hang. Same thing, desktop ok but VLC will not play videos until reboot. I just spent several hours trying different file types and decoder options. Very frustrating to see some behave nearly perfect in certain areas but fail m...
by emma1997
Fri May 15, 2020 6:07 pm
Forum: Beginners
Topic: Understanding the pi 5V pins
Replies: 5
Views: 453

Re: Understanding the pi 5V pins

make sure you get good quality 5V fans some user's have suffered pi damage from cheap 5V fans failing. pcmanbob tends to be somewhat excitable and prone to engage in F.U.D. Not that often and IME forgivable with all the good work he does accomplish here. I use only the cheapest chinese fans (hundre...
by emma1997
Fri May 15, 2020 5:55 pm
Forum: Troubleshooting
Topic: Raspberry pi 4 element identification
Replies: 7
Views: 305

Re: Raspberry pi 4 element identification

If this is indeed a power switch for USB I wonder if bypassing it, even on functional units, might solve a lot of the problems encountered there (amp limits, misbehaving peripherals, attaching hubs, etc).
by emma1997
Fri May 15, 2020 5:44 pm
Forum: Troubleshooting
Topic: RPi4 error booting w/ external data hdd
Replies: 38
Views: 949

Re: RPi4 error booting w/ external data hdd

Plug your USB drives in to the windows PC in a different order they'll get different Drive Numbers. Change which SATA port the internal drives are connected to they'll get different numbers too. I will repeat this is not the case IME. Maybe the first time you install the system but after that drive...
by emma1997
Fri May 15, 2020 5:30 pm
Forum: Advanced users
Topic: One power plug to rule them all?
Replies: 15
Views: 709

Re: One power plug to rule them all?

Those last two probably redundant. Seems like you only need one 12v supply with a 5v converter. Unless there is extreme noise etc from relays and pumps which is rare they can be powered off the same supply. If you want to get up to speed on those DC converters the thread from LTolledo is a great sta...
by emma1997
Thu May 14, 2020 5:21 am
Forum: Beginners
Topic: Controlling Voltage
Replies: 17
Views: 626

Re: Controlling Voltage

I have considerable experience with most motor types, ac/dc, brushed/bldc, big/tiny, and had suggestions. Using variable DC voltage will waste thousands of times more power as heat compared to PWM. Expensive and bulky linear power amp with huge heatsink needed instead of simple transistor. Probably ...

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