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by drgeoff
Mon Apr 23, 2018 9:48 am
Forum: Networking and servers
Topic: Internet sharing btw laptop and multiple RPis
Replies: 3
Views: 49

Re: Internet sharing btw laptop and multiple RPis

A router and a switch are different things. However many so called "routers" supplied by ISPs incorporate a switch. If you have a redundant one in your cupboard, just use only its LAN ports. So I need a router and not a switch? Is that correct? Thank you for your answer :) No, you do not need a rou...
by drgeoff
Mon Apr 23, 2018 9:42 am
Forum: Troubleshooting
Topic: red LED flashing 4 slow 4 fast
Replies: 2
Views: 42

Re: red LED flashing 4 slow 4 fast

Asterion wrote:
Mon Apr 23, 2018 7:41 am
Is this just that there is no 3+ image for TTB as yet?
Yes.
by drgeoff
Mon Apr 23, 2018 9:40 am
Forum: Troubleshooting
Topic: Problem restoring backup image
Replies: 2
Views: 51

Re: Problem restoring backup image

WIn32DiskImager makes an image file of the complete card - every single byte whether used or not. Not all cards of the same nominal size are exactly the same size, even from the same manufacturer's batch. You need a card of at least the same exact size as the one the backup was made from. Try using ...
by drgeoff
Mon Apr 23, 2018 9:23 am
Forum: Beginners
Topic: RaspBerry Pi as an RF repeater?
Replies: 5
Views: 98

Re: RaspBerry Pi as an RF repeater?

SmartHomeUser wrote:
Mon Apr 23, 2018 12:52 am
Maybe something like "If a certain code is received, transmit that code." Idk what is or isn't possible...
That doesn't solve the problem. Think about it.
by drgeoff
Mon Apr 23, 2018 8:03 am
Forum: General discussion
Topic: Controlling three solenoid valves with 12 mA limit
Replies: 7
Views: 231

Re: Controlling three solenoid valves with 12 mA limit

wh7qq wrote:
Mon Apr 23, 2018 12:08 am
the FQP 30N06L turn on voltage (Vgs) is spec'd as 1.0 to 2.4 V to turn on the FET
The spec sheet I'm looking at says different. Min 2.0 and max 4.0 for a drain current of only 250 micro-amps.
vgs.png
vgs.png (28.75 KiB) Viewed 18 times
by drgeoff
Sun Apr 22, 2018 10:57 pm
Forum: For sale
Topic: Belkin USBNet Cable - UK only
Replies: 2
Views: 157

Re: Belkin USBNet Cable - UK only

I'll assist with your Spring clean. PM me.
by drgeoff
Sun Apr 22, 2018 8:22 pm
Forum: Networking and servers
Topic: Internet sharing btw laptop and multiple RPis
Replies: 3
Views: 49

Re: Internet sharing btw laptop and multiple RPis

A router and a switch are different things. However many so called "routers" supplied by ISPs incorporate a switch. If you have a redundant one in your cupboard, just use only its LAN ports.
by drgeoff
Sun Apr 22, 2018 8:14 pm
Forum: Troubleshooting
Topic: Pi 3 B+ Won't pull distro list
Replies: 5
Views: 117

Re: Pi 3 B+ Won't pull distro list

Are you on an ordinary home network or are you somewhere like a university or business that uses a proxy or has other network restrictions?
by drgeoff
Sun Apr 22, 2018 8:10 pm
Forum: Beginners
Topic: Video and Acclerometer
Replies: 3
Views: 67

Re: Video and Acclerometer

One step at a time.

First sense the tilt.

Then from the tilt, determine which video to play.

Then play that video.
by drgeoff
Sun Apr 22, 2018 6:47 pm
Forum: General discussion
Topic: is calibri & Helvetica font usable?
Replies: 7
Views: 184

Re: is calibri & Helvetica font usable?

Many well known fonts are protected by copyright so I expect that Libre Office is using vaguely similar looking, but not identical to, ones in commercial software.
by drgeoff
Sun Apr 22, 2018 5:24 pm
Forum: General discussion
Topic: Power
Replies: 14
Views: 353

Re: Power

Also, the description of the charger in question says, each USB port can provide up to 2.0 Amps of power The label on the item says 2.4 amps per port and 8 amps max total. charger.jpg As I've written previously elsewhere on the forum the multi-output units I've examined have nothing deliberately in...
by drgeoff
Sun Apr 22, 2018 2:24 pm
Forum: General discussion
Topic: Power
Replies: 14
Views: 353

Re: Power

With reference to the linked power supply. It clearly states this is a charger so you may find that at high load, 2.4A per USB socket the output voltage will fall below the required 5v, which is fine for charging phones and tablets but no good for powering a pi. Also with a max 0f 8A you will only ...
by drgeoff
Sun Apr 22, 2018 2:09 pm
Forum: Beginners
Topic: Not Booting
Replies: 6
Views: 138

Re: Not Booting

B.Goode wrote:
Sun Apr 22, 2018 12:25 pm
For support of an RPi 3B+ (and all earlier models) you will need NOOBS 2.7.0 or later.
That would be more accurately phrased as:

For support of a RPi 3B+ you will need NOOBS 2.7.0 or later. Those also support all earlier models.
by drgeoff
Sun Apr 22, 2018 1:58 pm
Forum: General discussion
Topic: Power
Replies: 14
Views: 353

Re: Power

Dougie's inability to read means he has once again provided an inappropriate answer. The OP wants to power at least 2 RPis from one PSU. The official PSU will not do that. The item linked to by the OP will probably be OK for 2 RPis but only someone who has tried that exact model powering multiple RP...
by drgeoff
Sun Apr 22, 2018 1:47 pm
Forum: General discussion
Topic: Controlling three solenoid valves with 12 mA limit
Replies: 7
Views: 231

Re: Controlling three solenoid valves with 12 mA limit

1. Without knowing the spec of the proximity sensor, specifically the output swing it is not possible to judge if the interface to the RPi GPIO will work. 2. The 3.3 volt output of a RPi GPIO may not be enough to switch every FET that conforms to the spec. (Range of Vgs) 3. The SSR circuit looks sus...
by drgeoff
Sun Apr 22, 2018 7:34 am
Forum: Troubleshooting
Topic: Low Power Warning?
Replies: 2
Views: 104

Re: Low Power Warning?

Bad PSU and/or inadequate cable.
by drgeoff
Sat Apr 21, 2018 8:30 pm
Forum: Beginners
Topic: Port 123 blocked, how to set time?
Replies: 6
Views: 158

Re: Port 123 blocked, how to set time?

I cannot offer any solution to your problem as I suspect that I am having the same problem. As a linux newbie I have been struggling to figure out why I cannot get my Pi 3B to pickup the correct time from the network servers. I have set the proper options in raspi-config, REPEATEDLY and still canno...
by drgeoff
Sat Apr 21, 2018 8:23 pm
Forum: General discussion
Topic: How to connect RPI to TTL micro-controller without USB convertor
Replies: 11
Views: 330

Re: How to connect RPI to TTL micro-controller without USB convertor

1. dmesg and similar will never show when something has been connected or disconnected from a UART. 2. Disconnect the other item and connect together the Tx and Rx pins of the RPi. Until you get a terminal echoing back through that loop what you type, it is pointless going further. Thanks for help....
by drgeoff
Sat Apr 21, 2018 8:22 pm
Forum: General discussion
Topic: How to connect RPI to TTL micro-controller without USB convertor
Replies: 11
Views: 330

Re: How to connect RPI to TTL micro-controller without USB convertor

1. dmesg and similar will never show when something has been connected or disconnected from a UART. 2. Disconnect the other item and connect together the Tx and Rx pins of the RPi. Until you get a terminal echoing back through that loop what you type, it is pointless going further. You need to conn...
by drgeoff
Sat Apr 21, 2018 6:23 pm
Forum: Troubleshooting
Topic: Keyboard problem
Replies: 3
Views: 60

Re: Keyboard problem

What layout is your keyboard? https://en.wikipedia.org/wiki/Keyboard_layout
by drgeoff
Sat Apr 21, 2018 2:41 pm
Forum: Advanced users
Topic: Power up Raspberry Pi from GPIO pins
Replies: 7
Views: 211

Re: Power up Raspberry Pi from GPIO pins

No, there is no extra configuration needed (or even existing) to power via the GPIO header. Sounds like your power circuit is not able to provide sufficient current.

Have you measured the voltage when the RPi with SD card is connected to the power circuit?
by drgeoff
Sat Apr 21, 2018 2:38 pm
Forum: Troubleshooting
Topic: Using Pi3 microSD on Pi3+
Replies: 10
Views: 296

Re: Using Pi3 microSD on Pi3+

Run the RPI3B+ from the new SD card that you say works OK. Put the old card in a USB card reader and plug it into one of the USB ports of the RPi3B+. Copy what you need from old card to new card.
by drgeoff
Sat Apr 21, 2018 2:31 pm
Forum: Off topic discussion
Topic: old obsolete advice about turning a PI 3 into a Router?
Replies: 9
Views: 9801

Re: PI 3 into a Router?

KLL wrote:
Sat Apr 21, 2018 1:57 pm
you did not say with what hardware and OS you tested this tutorial ( from 2012 ).
I doubt that he did test it. Using any release of Raspbian from the last year or two and setting static IP parameters in the interfaces file is not a good way to start.
by drgeoff
Sat Apr 21, 2018 2:21 pm
Forum: General discussion
Topic: How to connect RPI to TTL micro-controller without USB convertor
Replies: 11
Views: 330

Re: How to connect RPI to TTL micro-controller without USB convertor

1. dmesg and similar will never show when something has been connected or disconnected from a UART.

2. Disconnect the other item and connect together the Tx and Rx pins of the RPi. Until you get a terminal echoing back through that loop what you type, it is pointless going further.

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