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by Imperf3kt
Sun Apr 21, 2019 6:18 am
Forum: General discussion
Topic: STICKY: Pi 3 A+
Replies: 132
Views: 28359

Re: STICKY: Pi 3 A+

It would no longer be a single board computer then, now would it.
by Imperf3kt
Thu Apr 18, 2019 10:25 pm
Forum: General discussion
Topic: Control powerfull pwm fans with Pi
Replies: 11
Views: 427

Re: Control powerfull pwm fans with Pi

mikronauts wrote:
Thu Apr 18, 2019 9:39 pm
Good point, max current is only 2A on the L298.
Well, you can parallel up the inputs and outputs on this chip to make a 4A continuous drive bridge but that's still far short of 40W
by Imperf3kt
Thu Apr 18, 2019 7:52 pm
Forum: Advanced users
Topic: USB hub chip compatibility
Replies: 9
Views: 271

Re: USB hub chip compatibility

Surely all we need is for someone who has one to report the relevant parts of the response to an lsb command. I was unaware of this command, thanks for mentioning it, will be useful. Thanks everyone for the comments / suggestions. I think my best approach is as suggested, to use the same chip found...
by Imperf3kt
Thu Apr 18, 2019 7:46 pm
Forum: General discussion
Topic: Max Power Supply For Raspberry Pi 3 b +
Replies: 27
Views: 516

Re: Max Power Supply For Raspberry Pi 3 b +

Somebody correct me if I'm wrong, but if you supply your +5V to GPIO Pin 2 or 4, you bypass the poly fuse, and its current limit. I'm not saying its a good idea to do that, but it is an option. I've done it on Pi Zero's that don't have a poly fuse anyway, and a couple of A+'s because it made feedin...
by Imperf3kt
Thu Apr 18, 2019 7:41 am
Forum: General discussion
Topic: Max Power Supply For Raspberry Pi 3 b +
Replies: 27
Views: 516

Re: Max Power Supply For Raspberry Pi 3 b +

For an actual explanation, part of the reason you must order such a large amount is because it is only financially viable for them to sell you at least that many. They need to pay their staff to redesign this custom Pi for you and that costs a lot of money, which gets siphoned from the relatively mi...
by Imperf3kt
Thu Apr 18, 2019 3:18 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 49
Views: 766

Re: How to calculate resistors...

A single GPIO pin can supply more than 16mA, it's just that's the number that we were given as a safe limit, not to be exceeded. Recently, there was some discussion about where the figures even came from and if they still applied to all Pi models. I believe Jamesh said he would look into it, however...
by Imperf3kt
Thu Apr 18, 2019 12:59 am
Forum: Other projects
Topic: Power supply for mobile project.
Replies: 2
Views: 73

Re: Power supply for mobile project.

Where is your wall situated? If it is in daylight at all, it may not even work.

Projector technology works only in dimly lit areas and simply doesn't work outdoors
by Imperf3kt
Thu Apr 18, 2019 12:19 am
Forum: Advanced users
Topic: PI 3b power to USB and peripherals. Dependent on PI or power supply?
Replies: 6
Views: 134

Re: PI 3b power to USB and peripherals. Dependent on PI or power supply?

Also note that if you supply power via the micro USB port, you will be limited to a budget of ~2.5A as there is a polyfuse which will limit the current the Pi can draw.
by Imperf3kt
Wed Apr 17, 2019 9:11 pm
Forum: Beginners
Topic: SCREEN
Replies: 13
Views: 260

Re: SCREEN

Why specifically 24 inches?
A 7 inch screen should be sufficient, surely?

I found a few (expensive) hits when googling for "24 inch usb touchscreen" and several hundred (affordable) options for 7" screens.

Can you compromise, or must it be 24"?
I also assume the program expects a high resolution?
by Imperf3kt
Wed Apr 17, 2019 8:34 am
Forum: General discussion
Topic: ALT - Power Source Question
Replies: 11
Views: 276

Re: ALT - Power Source Question

obsidianram wrote:
Wed Apr 17, 2019 8:23 am
I saw a chart somewhere of four different Pi models with their power draws listed (at idle and at load)...have to go back and see if I bookmarked it (on another system).
That would probably be this page, about halfway down
https://www.raspberrypi.org/documentation/faqs/#power
by Imperf3kt
Wed Apr 17, 2019 5:14 am
Forum: General discussion
Topic: ALT - Power Source Question
Replies: 11
Views: 276

Re: ALT - Power Source Question

Yes, unfortunately the canakit power supply has a reputation for not being too good. A lot of people mistake it for the official power supply because it is sold as part of a kit, but it is in fact 3rd party. There is only one (well two) official power supply, manufactured by Stontronics. It has a no...
by Imperf3kt
Wed Apr 17, 2019 5:08 am
Forum: General discussion
Topic: What would be the charging current for a board like this?
Replies: 11
Views: 298

Re: What would be the charging current for a board like this?

Yes, that's what I gather from the information provided.
Good luck with it and do come back to let us know how it goes.
by Imperf3kt
Wed Apr 17, 2019 4:56 am
Forum: General discussion
Topic: What would be the charging current for a board like this?
Replies: 11
Views: 298

Re: What would be the charging current for a board like this?

That diagram looks wrong, why does it say both ends are for a battery? It is also not the same as the module in the link you previously posted, so may not work the same way. From what I know of these types of devices, you supply voltage to the pads on the left and it charges the battery on the right...
by Imperf3kt
Wed Apr 17, 2019 3:06 am
Forum: General discussion
Topic: What would be the charging current for a board like this?
Replies: 11
Views: 298

Re: What would be the charging current for a board like this?

Assuming your batteries are connected before the buck converter, kind of. As is, you could only charge the batteries if the switch was closed, which would mean your Pi would be powered. This is somewhat inverse to how people typically charge batteries where the device can be either on or off and it ...
by Imperf3kt
Wed Apr 17, 2019 2:12 am
Forum: General discussion
Topic: What would be the charging current for a board like this?
Replies: 11
Views: 298

Re: What would be the charging current for a board like this?

Oops, was thinking of parallell charging. For 4s charging it is simply the number of cells in series, times the charge voltage, which is no more than 4.2v for lithium based batteries. 4*4.2=16.8, so yes, 16.8v would be okay. The 14.8v in the description is referring to the nominal output voltage. 4*...
by Imperf3kt
Wed Apr 17, 2019 12:19 am
Forum: General discussion
Topic: What would be the charging current for a board like this?
Replies: 11
Views: 298

Re: What would be the charging current for a board like this?

Stop before you cause an explosion (literally!) That is a lithium ion 4S battery balancing module. The charge current is 60mA, but I think you mean the voltage which is NOT 16.8v, but about 4.2v or Less. It is probably designed to work off 5v, but you'd need to check its datasheet to be sure. If you...
by Imperf3kt
Tue Apr 16, 2019 7:54 am
Forum: Advanced users
Topic: USB hub chip compatibility
Replies: 9
Views: 271

Re: USB hub chip compatibility

Can you provide details on your non-working hubs? Sure. One of the USB 2.0 hubs was an unbranded generic oriental import. The PCB inside it states a brand "xinbolo" and the USB chip is HS8836 This hub works perfectly on Windows, but if I attempt to use it on a Pi, nothing will work (testing with a ...
by Imperf3kt
Tue Apr 16, 2019 4:38 am
Forum: Troubleshooting
Topic: BASH clone of ZORK game (Help needed)
Replies: 7
Views: 184

Re: BASH clone of ZORK game (Help needed)

Personally I would stop where you are. "Zork" is actively copyright of Activision, who have been known to previously issue Cease and Desist notices over the IP in the past. You may, however, continue work on "Dungeon" provides it is not commercial. https://en.wikipedia.org/wiki/Zork#Zork_and_Dungeon...
by Imperf3kt
Tue Apr 16, 2019 12:57 am
Forum: Advanced users
Topic: USB hub chip compatibility
Replies: 9
Views: 271

USB hub chip compatibility

After some recent difficulties regarding a Pi Zero and USB hubs, I have decided to build my own custom hub and get a few extra features I would like while I'm at it to make it cost efficient, but I'm unsure of compatibility. The Texas Instruments tusb4041i-q1 looks really promising, but I don't know...
by Imperf3kt
Mon Apr 15, 2019 10:36 pm
Forum: Gaming
Topic: raspberry pi cases
Replies: 4
Views: 111

Re: raspberry pi cases

I recently saw one forum user post his/her clever reuse of old PC speakers to hide their Pi.
Speaker removed of course
by Imperf3kt
Mon Apr 15, 2019 8:55 pm
Forum: Beginners
Topic: Forum permissions
Replies: 2
Views: 78

Re: Forum permissions

Welcome to the world of forums. The reason for the text you see is because some forums allow guest posting - posting without an account. This particular forum, does not, and so you have no permissions, until you log in. It is merely a way of informing users what priveleges (not rights) they have acc...
by Imperf3kt
Mon Apr 15, 2019 8:43 pm
Forum: General discussion
Topic: Powering RPI 3B+ With 24VAC
Replies: 17
Views: 506

Re: Powering RPI 3B+ With 24VAC

This is perfect. I can’t find it on amazon. Need to see where I can get it. https://www.raspberrypi.org/forums/download/file.php?id=29298 Try searching for the following: micro usb to screw terminal That gave me multiple hits for both male and female kinds. However, seems kind of bulky compared to ...
by Imperf3kt
Sun Apr 14, 2019 9:52 pm
Forum: General discussion
Topic: ALT - Power Source Question
Replies: 11
Views: 276

Re: ALT - Power Source Question

I think you might want to research wireless charging a bit better. Most commercially available "wireless chargers" do not work more than 10 cm away from the charge pad and all are very inefficient. A 2A output would generate a lot of heat. Which "official" power supply do you have? Can you link it?...
by Imperf3kt
Sun Apr 14, 2019 9:27 pm
Forum: General discussion
Topic: ALT - Power Source Question
Replies: 11
Views: 276

Re: ALT - Power Source Question

I think you might want to research wireless charging a bit better. Most commercially available "wireless chargers" do not work more than 10 cm away from the charge pad and all are very inefficient.
A 2A output would generate a lot of heat.

Which "official" power supply do you have? Can you link it?
by Imperf3kt
Sun Apr 14, 2019 1:12 am
Forum: General discussion
Topic: Powering RPI 3B+ With 24VAC
Replies: 17
Views: 506

Re: Powering RPI 3B+ With 24VAC

Noel_g wrote:
Sun Apr 14, 2019 12:19 am
What if I soldered to a mini usb cable and used the standard port?
Typically not recommended as a standard microUSB connector usually introduces a lot of resistance and therefore, voltage drop.

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