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by drgeoff
Wed Jul 18, 2018 4:30 pm
Forum: Troubleshooting
Topic: Can't boot RPi 3 model B. Old wine, new skins?
Replies: 2
Views: 29

Re: Can't boot RPi 3 model B. Old wine, new skins?

Golden rule:

Do not expect an OS or NOOBS version that was released before a specific model of RPi to work on that RPi.
by drgeoff
Wed Jul 18, 2018 4:24 pm
Forum: Advanced users
Topic: Power Rpi 3 B+ from led strip PSU
Replies: 5
Views: 37

Re: Power Rpi 3 B+ from led strip PSU

That should work fine as long as you use a large gauge power wire and/or keep it very short. That appears to be a Mean Well power supply, one of my favorites, which will only put out 5.0V. With the large current draw and voltage level sensitivity of a RasPi 3B+ having a 5.2V output power supply is ...
by drgeoff
Wed Jul 18, 2018 2:38 pm
Forum: General discussion
Topic: system for controlling and monitoring device
Replies: 4
Views: 70

Re: system for controlling and monitoring device

Your project does not require a database. You do need something which measures the temperature and somehow feeds that into the RPi as a number which can be put in the appropriate page on the web server. You also need some way of getting whatever commands you click on the web page out of the RPi and ...
by drgeoff
Wed Jul 18, 2018 1:02 pm
Forum: General discussion
Topic: What has changed with Composite on the RPi?
Replies: 15
Views: 1428

Re: What has changed with Composite on the RPi?

Hi David, did you ever work out why you got so much bleed with your new pi? I'm having the exact same issue, and plugged in my first gen pi to have a nice crisp image. AIUI only the socket changed. Clearly you must be using a different cable when using a new RPi with TRRS socket compared to phono s...
by drgeoff
Tue Jul 17, 2018 10:12 pm
Forum: Troubleshooting
Topic: Clustering Pi B+ to Windows PC?
Replies: 3
Views: 123

Re: Clustering Pi B+ to Windows PC?

Short answer: Forget it.

Long answer: Use a search engine to find and read all the discussions about clustering RPis. Then factor in that there will certainly not be fewer negative issues when clustering machines with different processor architectures and different Operating Systems.
by drgeoff
Tue Jul 17, 2018 10:03 pm
Forum: Beginners
Topic: Rasberry pi 3 b+ battery
Replies: 7
Views: 174

Re: Rasberry pi 3 b+ battery

Back of fag packet calculation: Take a ballpark figure of 1 amp for the current consumption of a RPi3. That's 5 watts. For two weeks means 1680 watt-hours. For a 12 volt battery that would equate to 140 amp-hours. A typical 12 volt car battery (medium size car) is in the 40 to 60 amp-hour range. For...
by drgeoff
Tue Jul 17, 2018 3:46 pm
Forum: Automation, sensing and robotics
Topic: PS4 controlled robot
Replies: 3
Views: 70

Re: PS4 controlled robot

Hello all, I plan to build a 2 wheel drive robot controlled with a pi 3 b+ model, and it is to be controlled using a PS4 Controller. Any tips on how to do that? This is my first project and I have 0 experience , so if you guys could use simple terms for me to understand, that would be great. I need...
by drgeoff
Tue Jul 17, 2018 2:50 pm
Forum: Networking and servers
Topic: SATA
Replies: 3
Views: 119

Re: SATA

An external USB drive consists of a USB-SATA interface and a SATA drive.

To connect a SATA drive to a RPi you would need a USB-SATA interface.

"6 of one or half a dozen of the other."
by drgeoff
Tue Jul 17, 2018 2:39 pm
Forum: Beginners
Topic: Pi 3 model B+ not boot
Replies: 10
Views: 201

Re: Pi 3 model B+ not boot

Download Raspbian lite and use Etcher to put it on a card. (No need to unzip the Raspbian as Etcher will handle that.)

Does that boot?
by drgeoff
Tue Jul 17, 2018 2:07 pm
Forum: Beginners
Topic: fresh install raspi3: no graphical login
Replies: 2
Views: 57

Re: fresh install raspi3: no graphical login

Raspbian lite does not have the graphical desktop.

If you wan the GUI you need to add it.

Or install the full Raspbian.
by drgeoff
Tue Jul 17, 2018 10:57 am
Forum: Automation, sensing and robotics
Topic: Is it possible to read the value of a UK dimmer switch with Raspberry Pi?
Replies: 21
Views: 384

Re: Is it possible to read the value of a UK dimmer switch with Raspberry Pi?

daviestar wrote:
Tue Jul 17, 2018 8:45 am
the shaft is 6-7mm
The standard pot shaft (not just in the UK) is 1/4 inch diameter with a locating flat for the grub screw or spring bar of the knob.
by drgeoff
Tue Jul 17, 2018 10:40 am
Forum: General discussion
Topic: trying to bring up a raspberry pI
Replies: 2
Views: 132

Re: trying to bring up a raspberry pI

You cannot realistically expect help if you provide so little information.
by drgeoff
Mon Jul 16, 2018 9:55 pm
Forum: Advanced users
Topic: Controlling the Power Consumption of RPi Models
Replies: 7
Views: 5453

Re: Controlling the Power Consumption of RPi Models

If GeekMike is applying for a US patent, the US Patent Office will grant almost anything that is not blindingly obvious even if prior art exists.
by drgeoff
Mon Jul 16, 2018 9:47 pm
Forum: Beginners
Topic: Controlling Pi over Long Distances
Replies: 6
Views: 131

Re: Controlling Pi over Long Distances

Surely "control" is the lesser of your worries. How are you going to get moving video from the car to you?
by drgeoff
Mon Jul 16, 2018 7:14 pm
Forum: Troubleshooting
Topic: Pi 3B+ / Shorting 3.3V to GND
Replies: 14
Views: 294

Re: Pi 3B+ / Shorting 3.3V to GND

It would be a race between a chip's delicate internals being fried and a piece of wire inside the fuse heating up and melting.

Guess who the winner would be.

(Hint. You probably will not like the answer.)
by drgeoff
Mon Jul 16, 2018 7:05 pm
Forum: Automation, sensing and robotics
Topic: Is it possible to read the value of a UK dimmer switch with Raspberry Pi?
Replies: 21
Views: 384

Re: Is it possible to read the value of a UK dimmer switch with Raspberry Pi?

Thanks for the replies, and apologies for the confusion, I did indeed mean a standard UK dimmer switch module with push on/off. Some thing like this: https://www.amazon.co.uk/Varilight-Standard-Dimmer-Classic-Plastic/dp/B01N1806WY What are you trying to do with it? I am working on a smart light swi...
by drgeoff
Mon Jul 16, 2018 5:13 pm
Forum: Beginners
Topic: Network Attached Storage: Pi not visible on home network
Replies: 2
Views: 63

Re: Network Attached Storage: Pi not visible on home network

Can you ping the RPi from the PC? And vice versa?
by drgeoff
Mon Jul 16, 2018 5:07 pm
Forum: Automation, sensing and robotics
Topic: connecting multiple magnetic switches
Replies: 25
Views: 2297

Re: connecting multiple magnetic switches

Voltage drop is not the problem - no need to use more than the 3.3 volt rail. Possible pickup into longish wires, especially when the switch is open is the issue. Simplest way to deal with that is to add a series resistor and a decoupling capacitor. One end of that resistor to the junction of switch...
by drgeoff
Mon Jul 16, 2018 4:45 pm
Forum: Media centres
Topic: DLNA client via browser?
Replies: 2
Views: 96

Re: DLNA client via browser?

Install piCoreplayer on the RPi. Use its menu to install Logitech Media Server. In LMS install Philippe's UPnP/DLNA bridge plugin.

Control from a browser.

(If you have any Chromecasts, also install Philippe's Castbridge plugin.)
by drgeoff
Mon Jul 16, 2018 4:37 pm
Forum: Media centres
Topic: Portable Plex Pi Media Server and Hotspot Bridge
Replies: 3
Views: 119

Re: Portable Plex Pi Media Server and Hotspot Bridge

Plex Media Server.
by drgeoff
Mon Jul 16, 2018 10:14 am
Forum: Advanced users
Topic: What would the max frequency of a C program be?
Replies: 4
Views: 172

Re: What would the max frequency of a C program be?

Same answer as for "How long is a piece of string?"

It depends.
by drgeoff
Mon Jul 16, 2018 10:06 am
Forum: Beginners
Topic: VOIP Server RPI
Replies: 2
Views: 85

Re: VOIP Server RPI

Asterisk running on a RPi is far from sufficient to meet the OP's requirement. Asterisk is a switch for digital phone signals. It cannot be connected directly to a standard analogue (POTS/PSTN) phone or phone line. You need an Analogue Telephone Adapter (ATA) to do that. FXS port for phone, FXO port...
by drgeoff
Sat Jul 14, 2018 11:11 pm
Forum: Advanced users
Topic: PWM hardware for dimming LCD
Replies: 3
Views: 145

Re: PWM hardware for dimming LCD

Inadequate PSU whose voltage falls too much when RPi begins working harder and drawing more current?
by drgeoff
Sat Jul 14, 2018 11:01 pm
Forum: Troubleshooting
Topic: Pi 3B+ / Shorting 3.3V to GND
Replies: 14
Views: 294

Re: Pi 3B+ / Shorting 3.3V to GND

There is a chip (U8, a XR77004) on the 3B+ which contains most of the circuitry for some DC-DC converters. See https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_3bplus_1p0_reduced.pdf. One of those converters is for the 3.3 volt rail. I would not place any credence on...

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