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by W. H. Heydt
Thu Jun 20, 2019 4:42 am
Forum: Beginners
Topic: Power on / shutdown RPI time or network
Replies: 6
Views: 107

Re: Power on / shutdown RPI time or network

Just another note, given the intended use of the Pi... A Pi is not rated to be a medical device, nor is it rated for any "life safety" application. If it is critical that you continuously monitor blood glucose at night (and, one might presume, set off an alarm if it goes out of a pre-set range), whi...
by W. H. Heydt
Thu Jun 20, 2019 4:36 am
Forum: Beginners
Topic: Powering a raspberry pi 3 b+ with batteries
Replies: 2
Views: 59

Re: Powering a raspberry pi 3 b+ with batteries

Hi, I am relatively new to raspberry and I need my raspberry to run on batteries for a project Im working on. After looking online for solutions I found many different batteries that run on different voltages with a variety of additional boards, if anybody could give me an explanation about the dif...
by W. H. Heydt
Thu Jun 20, 2019 4:31 am
Forum: Beginners
Topic: Turning off composite RCA output
Replies: 5
Views: 604

Re: Turning off composite RCA output

I would also like to get rid of the entry Composite-1 in my setup - see for example output of xrandr: Since this is, basically, a different question that the one dealt with above AND the last previous entry was 3 years ago (that is, at least one major OS release back), you'd be better off to start ...
by W. H. Heydt
Wed Jun 19, 2019 4:38 am
Forum: Beginners
Topic: 4 AA Battery pack for Servo
Replies: 5
Views: 105

Re: 4 AA Battery pack for Servo

Do you have a controller for your servo? The Pi very likely can't provide the power the servo motor needs. (But one can't be sure without a part or model number.) What GPIO pins are you using? How is your breadboard wired? You speak of "a" resistor. Most circuits (other than extremely simple ones) h...
by W. H. Heydt
Wed Jun 19, 2019 3:04 am
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 13
Views: 298

Re: Battery for Pi Zero with 3G

kyleisnot wrote:
Wed Jun 19, 2019 1:10 am
I am doing it this way because the trap is very fast, designed to break the animal's neck quickly and painlessly.
Not everyone will want to assist you in building a lethal trap. Have you considered using a live trap so that you can avoid killing animals you don't want to kill?
by W. H. Heydt
Wed Jun 19, 2019 12:20 am
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 13
Views: 298

Re: Battery for Pi Zero with 3G

A Pi0 is going to draw about 100mA (perhaps less, but work with that). It will be at 5v. So the required power (W) is 0.1A * 5v = 0.5W. To run for 120 hrs. (5 days), it will use 0.5W * 120h = 60Wh. Therefore, you need a battery with more than 60Wh available. Since batteries don't generally put out ...
by W. H. Heydt
Wed Jun 19, 2019 12:15 am
Forum: General discussion
Topic: Is my cell phone charger good enough to supply power to my raspberry pi
Replies: 9
Views: 257

Re: Is my cell phone charger good enough to supply power to my raspberry pi

Hello, I have got a cell phone charger and it is 5v 2a (it says).It's what I use to power my raspberry pi. But there is still a lightning bolt icon on the top right of my screen. It barely goes off. Should I be scared ? Scared? No. It won't hurt the Pi. The biggest risk is some peripherals not work...
by W. H. Heydt
Tue Jun 18, 2019 10:54 pm
Forum: Beginners
Topic: 4 AA Battery pack for Servo
Replies: 5
Views: 105

Re: 4 AA Battery pack for Servo

We need wiring diagrams of exactly how you did the various hookups in order to tell what's wrong.
by W. H. Heydt
Tue Jun 18, 2019 6:42 pm
Forum: General discussion
Topic: Raspberry Pi Zero W board - Deep Sleep Mode configuration and wake up
Replies: 3
Views: 112

Re: Raspberry Pi Zero W board - Deep Sleep Mode configuration and wake up

There is no "deep sleep" mode. You can shut it down, and leave the power connected, so that grounding a specific GPIO will restart it, but IIRC the power draw is still high for battery use. The other option is to use external hardware to shut off the power, and then reaplly it when needed. There ar...
by W. H. Heydt
Mon Jun 17, 2019 5:49 pm
Forum: Beginners
Topic: Using a network printer
Replies: 1
Views: 58

Re: Using a network printer

Install CUPS, the (current) standard Linux printer subsystem. Within cups, you will need to install drivers for whatever printer you have and set up a printer queue for it. You can also make it publicly shareable (that is, the Pi will accept files to be printed and then queue them to be sent to the ...
by W. H. Heydt
Mon Jun 17, 2019 6:17 am
Forum: Beginners
Topic: MP4 Video Player
Replies: 3
Views: 101

Re: MP4 Video Player

LTolledo wrote:
Mon Jun 17, 2019 6:04 am
Kodi
Sounds more like a school project and the OP is likely supposed to write it himself rather that using an off-the-shelf solution.
by W. H. Heydt
Sun Jun 16, 2019 11:51 pm
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 13
Views: 298

Re: Battery for Pi Zero with 3G

For the length of time you need, a lead acid battery such as a yard battery or a car battery would work. A 12v to 5v DC-DC convertor will be required. Car batteries aren't great for this sort of thing. They don't like being discharged below about 50% capacity. A "Leisure" battery, as used in boats ...
by W. H. Heydt
Sun Jun 16, 2019 8:09 pm
Forum: General discussion
Topic: raspbian wheeze
Replies: 3
Views: 143

Re: raspbian wheeze

Also note...the current release of Raspbian is two entire major releases past Wheezy. It went through Jessie and is now on Stretch. Any time now, it will go to Buster. What you are running is about 6 years out of date.
by W. H. Heydt
Sun Jun 16, 2019 3:28 pm
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 13
Views: 298

Re: Battery for Pi Zero with 3G

A Pi0 is going to draw about 100mA (perhaps less, but work with that). It will be at 5v. So the required power (W) is 0.1A * 5v = 0.5W. To run for 120 hrs. (5 days), it will use 0.5W * 120h = 60Wh. Therefore, you need a battery with more than 60Wh available. Since batteries don't generally put out 5...
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: 93

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: 396

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: 396

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: 66

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: 396

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: 299

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: 290

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: 250

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: 396

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: 188

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: 290

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...

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