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by W. H. Heydt
Sat Jun 15, 2019 8:17 pm
Forum: Beginners
Topic: Power Supply Pi3B+ & Original Raspberry Pi 7" Touchscreen
Replies: 3
Views: 64

Re: Power Supply Pi3B+ & Original Raspberry Pi 7" Touchscreen

Besides wondering what you mean by "original RPF touchscreen", it will depend on what else you're going to connect to your Pi3B+. If it's just a keyboard and mouse, you should be able to get away with a *good* 2A PSU, such as the previous model of official RPF one. To make it even better, you can gi...
by W. H. Heydt
Sat Jun 15, 2019 3:01 am
Forum: General discussion
Topic: Turn RPi 3 on with remote?
Replies: 13
Views: 347

Re: Turn RPi 3 on with remote?

Thanks so much for everyone's replies. Looks like there's not really a solution for what I was after, so for the moment I just won't turn it off. Might buy a Flirc v2 case for it so it keeps nice and cool. I think I ought to point out that a TV that can be "turned on" or "turned off" with a remote,...
by W. H. Heydt
Fri Jun 14, 2019 8:53 pm
Forum: General discussion
Topic: Turn RPi 3 on with remote?
Replies: 13
Views: 347

Re: Turn RPi 3 on with remote?

What it really amounts to is that *something* has to be active and drawing power. That something has to be smart enough to recognize an input signal by some means or other and then trigger any further actions as needed. The very simplest solution of all is...don't turn the Pi off.
by W. H. Heydt
Fri Jun 14, 2019 4:20 pm
Forum: General discussion
Topic: Help! 5" LCD touchscreen have problem
Replies: 1
Views: 50

Re: Help! 5" LCD touchscreen have problem

I would suggest that you cut your losses. Return the screen, if you can, and get an official RPF 7" touchscreen as that is both known to work and is supported. Basically, there is no one here who can provide support for an unknown device with an unknown fault.
by W. H. Heydt
Thu Jun 13, 2019 2:55 am
Forum: General discussion
Topic: Turn RPi 3 on with remote?
Replies: 13
Views: 347

Re: Turn RPi 3 on with remote?

I assume OP is looking for a way to leave the Pi in "standby" mode for convenient on / off via a button on their remote control much like how your TV functions. You could probably just setup something that momentarily shorts the run pin to ground upon detecting a certain frequency. Maybe a transist...
by W. H. Heydt
Wed Jun 12, 2019 9:20 pm
Forum: Troubleshooting
Topic: Help Ray change location on screen.
Replies: 11
Views: 263

Re: Help Ray change location on screen.

Think of it this way: He's at the bottom of the Grand Canyon, so it's rather warm and without any mains power. Bottom of the Grand Canyon wouldn't worry me overly much about heat. Now if you were talking about being at Furnace Creek in Death Valley... But seriosly, where I live we've been having so...
by W. H. Heydt
Wed Jun 12, 2019 9:15 pm
Forum: Troubleshooting
Topic: Raspbian stuck at login
Replies: 13
Views: 263

Re: Raspbian stuck at login

Oh thanks ! I didn't know all of this. I mounted the root part of the good SD card this time and all my files are still there ! Thats's really cool. I still don't understand what happened to mySD card. My files are still there but I just can't login to the system. Is there a way to change to access...
by W. H. Heydt
Wed Jun 12, 2019 9:05 pm
Forum: Beginners
Topic: Anyone run MySQL on a RPi 3+?
Replies: 8
Views: 228

Re: Anyone run MySQL on a RPi 3+?

Great! Thanks guys. I'd never heard of MariaDB (I haven't touched programming in years) and I'm going to look into it. And I'm ordering another RPi today to install it on (for playing and learning). Cheers! MariaDB is a fork of MySQL that was started after Oracle bought MySQL. As I understand it, t...
by W. H. Heydt
Wed Jun 12, 2019 8:56 pm
Forum: General discussion
Topic: Turn RPi 3 on with remote?
Replies: 13
Views: 347

Re: Turn RPi 3 on with remote?

If the Pi has power, it is on (to varying extent, depending on what else has been done). If it doesn't have power, there is no way for it to act on any signal in the environment. So, basically, the answer is, no, that won't work. Note: You shouldn't just drop the power on a Pi. Start by issuing a sh...
by W. H. Heydt
Wed Jun 12, 2019 8:54 pm
Forum: General discussion
Topic: [Solved] Would the AC/DC adapter provided in the URL be enough for the PI 3b?
Replies: 5
Views: 171

Re: Would the AC/DC adapter provided in the URL be enough for the PI 3b?

mccurly wrote:
Wed Jun 12, 2019 8:34 pm
P.s.: How can I mark this topic as solved?
Edit your original post and change the subject line prefixing "[Solved]" to the existing thread topic.
by W. H. Heydt
Wed Jun 12, 2019 5:30 pm
Forum: Troubleshooting
Topic: Raspbian stuck at login
Replies: 13
Views: 263

Re: Raspbian stuck at login

An SD card with Raspbian on it has 2 partitions. The first partition is small, as you are seeing. That is the "boot" partition. It contains the files needed to do the initial phases of booting the system. The second partition is the "root" partition and contains everything else and is the working sy...
by W. H. Heydt
Wed Jun 12, 2019 3:05 pm
Forum: Troubleshooting
Topic: Help Ray change location on screen.
Replies: 11
Views: 263

Re: Help Ray change location on screen.

Another possibility is to make a small hole in the frame of the housing. So I can see the energy warning. At that time I will change the batteries. The power supply is enough for the raspberry, but when the batteries run out, it warns me with lightning. Warnings do not appear normally. But if they ...
by W. H. Heydt
Wed Jun 12, 2019 4:29 am
Forum: General discussion
Topic: Remote Control the RPi
Replies: 4
Views: 115

Re: Remote Control the RPi

Depends on what you mean by "control". The simplest way to run programs or issue commands to the Pi is to log in with an SSH client, such as PuTTY.
by W. H. Heydt
Tue Jun 11, 2019 10:47 pm
Forum: General discussion
Topic: RFID Question
Replies: 1
Views: 72

Re: RFID Question

You need to read the data sheet(s) that go with your device. It probably has commands to do what you want to do, but without knowing the exact make and model, there is no way anyone here can tell you what they are. That said, the code you use on the Pi could suspend its own activity for a period of ...
by W. H. Heydt
Tue Jun 11, 2019 10:31 pm
Forum: Off topic discussion
Topic: LEGO Raspberry Pi 3 B+
Replies: 2
Views: 268

Re: LEGO Raspberry Pi 3 B+

I would suggest rotation that top row of single blocks individually 90 degrees so that it looks more like the double row of GPIO pins.
by W. H. Heydt
Tue Jun 11, 2019 2:52 pm
Forum: Troubleshooting
Topic: Pi 3B - Broken SD card slot
Replies: 12
Views: 376

Re: Pi 3B - Broken SD card slot

Burngate wrote:
Tue Jun 11, 2019 10:19 am
Now's the time to learn. Like flint-knapping, it's a skill that could come in handy any time.
Now *that's* something I've seen up close and personal from a real expert. The guy who redeveloped the techniques, Francois Bordes.
by W. H. Heydt
Mon Jun 10, 2019 4:56 pm
Forum: Wanted
Topic: Blinking LED project to affect people afflicted with Alzheimer’s
Replies: 8
Views: 289

Re: Blinking LED project to affect people afflicted with Alzheimer’s

A couple of $/£/€ will buy a 555 timer IC and the few necessary resistors and capacitors required to generate such low frequencies. With a variable resistor you can adjust the frequency by turning a knob. No RPi. No software. Don't even have to get that complicated. I used to build 1Hz oscillators ...
by W. H. Heydt
Mon Jun 10, 2019 5:57 am
Forum: General discussion
Topic: Raspberry Pi-based Prosthetic leg
Replies: 1
Views: 116

Re: Raspberry Pi-based Prosthetic leg

That's really cool. For those that don't usually follow links, the underlying article is worth reading.
by W. H. Heydt
Sun Jun 09, 2019 8:45 pm
Forum: General discussion
Topic: A better raspbian for pi zero
Replies: 20
Views: 672

Re: A better raspian for pi zero

The pi zero is a lot more powerful than my 486 sx25 with 4mb Ram. I would certainly hope so, with 128 times the amount of RAM and 40 times the CPU clock speed (ignoring the other CPU differences like instruction set, cache, pipeline etc) :) Never underestimate the ability of shoddy engineers to was...
by W. H. Heydt
Sat Jun 08, 2019 11:29 pm
Forum: Off topic discussion
Topic: Maker Faire reportedly halts operations
Replies: 3
Views: 473

Re: Maker Faire reportedly halts operations

I saw that earlier today. I'm rather surprised that, given the numbers that turn out in San Mateo that they've run into that much financial trouble. I can only surmise that they didn't practice reasonable cost containment or try to negotiate better terms for their venues...or failing that, find a le...
by W. H. Heydt
Sat Jun 08, 2019 11:26 pm
Forum: Official Foundation Display
Topic: 7 inch touchscreen display
Replies: 2
Views: 121

Re: 7 inch touchscreen display

I have some I got from Monoprice when they were on sale. The ones I have don't seem to be listed at the moment, but I think their ones that list being for capacitive touch ought to work.
by W. H. Heydt
Sat Jun 08, 2019 10:49 pm
Forum: General discussion
Topic: A better raspbian for pi zero
Replies: 20
Views: 672

Re: A better raspian 4 pi zero

The current raspian is so bloated that install take so long. Then the update after boot take hours still going after 3. The reason why I bring this up. I found an old copy of Linux, kernel 3.x. Wow that system was fast, and worked wonderfully. Yet when the current noobs is great on the quad cores. ...
by W. H. Heydt
Sat Jun 08, 2019 9:32 pm
Forum: Troubleshooting
Topic: Pi 3B - Broken SD card slot
Replies: 12
Views: 376

Re: Pi 3B - Broken SD card slot

Guess I'll just buy another Pi. I just wish they'd make less flimsy SDcard slots and have had USB boot enabled by default on older models, but this one is going into the back of the cupboard, never to be seen again. When the Pi3B was launched, USB booting wasn't generally available. (I don't even t...
by W. H. Heydt
Sat Jun 08, 2019 4:46 pm
Forum: General discussion
Topic: Install ARMv6 apps in Raspberry Pi 3B
Replies: 3
Views: 141

Re: Install ARMv6 apps in Raspberry Pi 3B

Actually... A Pi3B is ARMv8, but the ARM series mostly has backwards compatibility. If all else, fails, install the package on a B+, A+, Pi0, or Pi0W.
by W. H. Heydt
Sat Jun 08, 2019 5:10 am
Forum: Beginners
Topic: Reading analog input voltage of 0-30v
Replies: 4
Views: 286

Re: Reading analog input voltage of 0-30v

Raspberry Pis do not have analog I/O pins. You will need an Analog to Digital (A/D) converter.

The way you scale a larger (e.g. 30v) signal to a smaller range (e.g. 3.3v) is with a voltage divider circuit, which can be as simple as 2 resistors in the proper ratio.

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