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by Imperf3kt
Thu Sep 19, 2019 11:16 pm
Forum: Troubleshooting
Topic: Raspberry Pi minimum operating temperature
Replies: 2
Views: 106

Re: Raspberry Pi minimum operating temperature

The Pi as a whole has a rating of -40°C, but that just the official numbers it's guaranteed to work until.
There have been reports of people using the Pi perfectly fine in up to sub 200°C
by Imperf3kt
Thu Sep 19, 2019 11:12 pm
Forum: Troubleshooting
Topic: Exit button on Raspberry PI
Replies: 3
Views: 107

Re: Exit button on Raspberry PI

Note that 10A 250v sounds like an AC rating, it won't be the same for DC.
by Imperf3kt
Thu Sep 19, 2019 10:44 pm
Forum: Advanced users
Topic: USB 3.0 OTG?
Replies: 9
Views: 270

Re: USB 3.0 OTG?

USB 3.0 on the Pi is achieved via PCI-e, you can't use it for OTG
by Imperf3kt
Thu Sep 19, 2019 8:03 am
Forum: General discussion
Topic: Low voltage warning even though gpio being powered with 5.07V?
Replies: 33
Views: 1023

Re: Low voltage warning even though gpio being powered with 5.07V?

rin67630 wrote:
Thu Sep 19, 2019 7:41 am
Paul Hutch wrote:
Wed Sep 18, 2019 2:33 pm
.. to calculate voltage drop based on AWG, current, and length.
The world is metric, excepted a few renitent Americans...
Is there an issue with using the American wire gauge?
I thought it was universally accepted except in Britain.
by Imperf3kt
Thu Sep 19, 2019 7:50 am
Forum: Other projects
Topic: Idea for an led strip shirt
Replies: 5
Views: 108

Re: Idea for an led strip shirt

I have a couple of old shirts that use a luminescent patch woven into the material. Like these: https://www.led-t-shirts.eu/ They tend to make a high pitched frequency when they light up. I find these to be dangerous though, several times I've had an electric shock from the connector being slightly ...
by Imperf3kt
Wed Sep 18, 2019 11:41 pm
Forum: Troubleshooting
Topic: [Not getting my full Gigabit internet speed on RPI 4b 4GB]
Replies: 15
Views: 371

Re: [Not getting my full Gigabit internet speed on RPI 4b 4GB]

It was suggested to use pip3, not apt. I don't know the difference that'd make, but it may be relevant. Now it's time to go back to wishing I had such speeds myself. Currently get around 5mbps download and 1mbps upload. In a few days that should be bumped up to 20/20 when my ISP switches me over to ...
by Imperf3kt
Wed Sep 18, 2019 11:26 pm
Forum: Beginners
Topic: RPI4 connected to a TV
Replies: 17
Views: 334

Re: RPI4 connected to a TV

Are you using NOOBS? Your description of how you installed the operating system suggests so. It is generally easier to forget NOOBS exists and install Raspbian directly onto your microSD card via Balena Etcher. NOOBS, ironically, is no longer suitable for newbies, instead only really useful for mult...
by Imperf3kt
Wed Sep 18, 2019 11:20 pm
Forum: Compute Module
Topic: Compute Module 4
Replies: 8
Views: 425

Re: Compute Module 4

Note that the CM3+ is considerably more powerful than the original CM. That may well be enough until a CM4 comes out (it's some way away) . Oooh, James has made an inadvertant product announcement. I know someone who got sued by IBM Corp. for pre-announcing IMS V1.3 (which included a feature in the...
by Imperf3kt
Wed Sep 18, 2019 9:33 pm
Forum: Beginners
Topic: Step motor fails to run backwards on raspberry
Replies: 2
Views: 61

Re: Step motor fails to run backwards on raspberry

Are you using a motor controller?
For example, an L298N
by Imperf3kt
Wed Sep 18, 2019 9:31 pm
Forum: Beginners
Topic: RPI4 connected to a TV
Replies: 17
Views: 334

Re: RPI4 connected to a TV

The first time I plugged my micro hdmi cable into my Pi4b, it felt like it had seated, but was in fact not properly inserted.
A little extra force made it "click" into place and work.

Are you sure yours is pushed all the way in?
by Imperf3kt
Wed Sep 18, 2019 8:01 pm
Forum: Troubleshooting
Topic: Clock?
Replies: 13
Views: 431

Re: Clock?

Your workaround of checking that the remote time servers are available seems reasonable. My concern is that a workaround is necessary. An application (and especially a user sitting at a keyboard ) shouldn't have to first check (or risk getting a failure) that the system time is valid before running...
by Imperf3kt
Tue Sep 17, 2019 11:50 pm
Forum: Off topic discussion
Topic: A modest (passive) suggestion
Replies: 10
Views: 462

Re: A modest (passive) suggestion

I once asked for a similar consideration, for use as power in, instead of using the GPIO. Since, ultimately, the request is the same, I feel you'll probably get the same response I did. I was told I was being rude and shunned faster than you could blink. A good work around is to remove the plastic s...
by Imperf3kt
Tue Sep 17, 2019 10:38 pm
Forum: General discussion
Topic: RP4 USB Battery Power - E Marked Issue
Replies: 9
Views: 373

Re: RP4 USB Battery Power - E Marked Issue

It's not overblown, most of those powerbanks that claim 2.1A, 2.4A etc have poor regulation and cannot deliver 5v when that much current is being drawn, leading to the Pi experiencing an undervolt situation which is known to be the cause of many other strange issues including SD card corruption. I'v...
by Imperf3kt
Tue Sep 17, 2019 10:04 am
Forum: General discussion
Topic: trying to buy more than 1 pi zero
Replies: 18
Views: 497

Re: trying to buy more than 1 pi zero

IT IS NOT A JOKE, DO NOT BE SO DISRESPECTFUL TO RPF / RPT Not everybody reads the forum before to find out why they can only buy one of a product. It's not disrespectful, it's ill-informed and expecting the product be sold by basic merchant practices that have existed for millennia. I find your nee...
by Imperf3kt
Tue Sep 17, 2019 3:44 am
Forum: General discussion
Topic: Low voltage warning even though gpio being powered with 5.07V?
Replies: 33
Views: 1023

Re: Low voltage warning even though gpio being powered with 5.07V?

That wire looks pretty thin and has a join in the middle.
You are likely experiencing voltage drop along its length. As above, measure the voltage at the GPIO header itself, not the power supply.
by Imperf3kt
Tue Sep 17, 2019 2:30 am
Forum: General discussion
Topic: RP4 USB Battery Power - E Marked Issue
Replies: 9
Views: 373

Re: RP4 USB Battery Power - E Marked Issue

I'd suggest any powerbank of your required capacity and 2.1 Amp output capability that does NOT support USB-C PD. And use a USB to USB-C cable that is not E-marked. 2.1 Amps should be enough for a RPi4B and light current USB peripherals. Why do you advise against the Power Delivery spec? It is, aft...
by Imperf3kt
Mon Sep 16, 2019 10:26 pm
Forum: Beginners
Topic: [SOLVED] Is this fiberglass sticking out of my Pi's PCB?
Replies: 4
Views: 161

Re: Is this fiberglass sticking out of my Pi's PCB?

I'd second just rubbing it with something.

There is little to no risk of harming yourself when handling it as long as you don't run your finger down the edge.
by Imperf3kt
Mon Sep 16, 2019 10:11 pm
Forum: General discussion
Topic: Pi 3b has Pi 3b+ Broadcom wifi/bt chip?
Replies: 8
Views: 318

Re: Pi 3b has Pi 3b+ Broadcom wifi/bt chip?

it says 'made in RPC' (China), and not the UK The Pi is made in two locations (three of you count the special case of Brazil, I believe) The UK, and communist China, otherwise known as the People's Republic of China, PRC for short. It isn't anything to worry about, it's not a fake. The Raspberry Pi...
by Imperf3kt
Mon Sep 16, 2019 9:49 pm
Forum: Advanced users
Topic: Raspberry Pi 4 Recommended Mobile Power
Replies: 10
Views: 443

Re: Raspberry Pi 4 Recommended Mobile Power

Step 1. Determine the actual power requirement for your setup. The max power for a Pi4B is 3A @ 5v, but that includes 1.2A for USB devices. Your actual requirements may be less. Step 2. Determine the power output (W) and energy capacity (Wh) of your proposed supply. Step 3. Make sure that the outpu...
by Imperf3kt
Mon Sep 16, 2019 9:36 pm
Forum: General discussion
Topic: Laptop speakers with Raspberry PI
Replies: 25
Views: 562

Re: Laptop speakers with Raspberry PI

qaz wrote:
Mon Sep 16, 2019 5:35 pm
Will post (if anyone cares) results when I make it work.
I'd be interested to see how your project turns out.
by Imperf3kt
Mon Sep 16, 2019 9:18 pm
Forum: General discussion
Topic: RP4 USB Battery Power - E Marked Issue
Replies: 9
Views: 373

Re: RP4 USB Battery Power - E Marked Issue

I dont know of any "battery pack" that comes with those e marked cables. So far, only high end power supplies have been reported to use them. Is there any battery pack that works with the Pi? Probably, but good luck finding it. I'd suggest looking for something with a USB-C PD port. I saw one locall...
by Imperf3kt
Sun Sep 15, 2019 11:25 pm
Forum: Beginners
Topic: Soldering
Replies: 22
Views: 477

Re: Soldering

Or you can use solder to bridge two holes next to each other. Solder your LED in, solder a wire to the hole either side of the LEDs legs, then melt some solder between to join the hole the wire is soldered to, with the hole the LED is soldered to. See some replies here for a detailed example. https:...
by Imperf3kt
Sun Sep 15, 2019 11:21 pm
Forum: Beginners
Topic: Native Youtube application for raspberry pi?
Replies: 2
Views: 118

Re: Native Youtube application for raspberry pi?

Not exactly what you're asking for, but it may work.
Have you considered Kodi with the YouTube app installed?
by Imperf3kt
Sun Sep 15, 2019 10:40 pm
Forum: General discussion
Topic: can I create my own PI card?
Replies: 8
Views: 280

Re: can I create my own PI card?

If Python is important to your application why not make use of Cython?
by Imperf3kt
Sun Sep 15, 2019 10:24 pm
Forum: General discussion
Topic: Laptop speakers with Raspberry PI
Replies: 25
Views: 562

Re: Laptop speakers with Raspberry PI

I'd recommend the PAM8406 over the PAM8403. I've used both and the 8406 was much better quality for cents more. Depending on your configuration, the 8406 may require a heatsink (any scrap metal should be enough with a 2mm aluminium chunk preferred) You can get them with pre soldered headers if you w...

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