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by davidcoton
Mon Jun 24, 2019 8:46 am
Forum: Beginners
Topic: Issue with Raspberry Pi zero and Waveshare gsm HAT
Replies: 21
Views: 458

Re: Issue with Raspberry Pi zero and Waveshare gsm HAT

Andyroo wrote:
Sun Jun 23, 2019 11:28 pm
So if you use minicomputer and loop the TX/RX pins on the Pi do you get an echo of what you type?
FTFY, I think. Spell check converted software to hardware :twisted:
by davidcoton
Sun Jun 23, 2019 3:14 pm
Forum: General discussion
Topic: Is my HDMI port fried? RPi 3B+
Replies: 14
Views: 646

Re: Is my HDMI port fried? RPi 3B+

Just to add, on the subject of electrical fault protection: UK wiring regulations permit protection by fuses, usually an overcurrent fault will trip a single circuit. Or by MCBs, which are a resettable "fuse" and provide equivalent (usually faster) protection. This may (on recent systems usually mus...
by davidcoton
Fri Jun 21, 2019 8:40 am
Forum: Troubleshooting
Topic: USB Auto mount - Raspbian Stretch Lite [Solved]
Replies: 20
Views: 50283

Re: USB Auto mount - Raspbian Stretch Lite [Solved]

Although this is an official forum, the contributors are all volunteers. No-one owes you an answer, and it is of course impossible for anyone to tell you when everyone is out of answers.

It is also unhelpful to hijack a thread marked "[Solved]", and sarcasm does not help.
by davidcoton
Thu Jun 20, 2019 4:34 pm
Forum: General discussion
Topic: Is my cell phone charger good enough to supply power to my raspberry pi
Replies: 20
Views: 840

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

There are three categories of charger: The Good The Bad The Ugly Only chargers in the first category will work properly to power a Pi. Unfortunately it is not always possible to determine the category of a particular charger; some may even vary in category depending on temperature, phase of moon, an...
by davidcoton
Thu Jun 20, 2019 9:10 am
Forum: General discussion
Topic: The correct "over_voltage" settings in RPI 2B for (Overclock )
Replies: 11
Views: 319

Re: The correct "over_voltage" settings in RPI 2B for (Overclock )

it's up to you to find out whats the best stable overclock on your setup is, my version may be not be stable on yours +1 (as amended) The overvoltage setting is provided precisely because not all SoCs react the same way. If you want to overclock (and it sounds like you don't really need to) you nee...
by davidcoton
Thu Jun 20, 2019 8:59 am
Forum: Troubleshooting
Topic: PI 3B+ WIFI not working on different AP/routers
Replies: 15
Views: 574

Re: PI 3B+ WIFI not working on different AP/routers

First thing to try is to complete the installation -- update/upgrade is part of it, so:

Code: Select all

sudo apt update
sudo apt full-upgrade
and try the WiFi connect again.
by davidcoton
Thu Jun 20, 2019 8:55 am
Forum: Troubleshooting
Topic: Headless 3B+ will not boot from micro SD Stretch, Lite, or Full
Replies: 7
Views: 497

Re: Headless 3B+ will not boot from micro SD Stretch, Lite, or Full

If you had an "ssh" file in the boot partition originally, and it has now gone, then the Pi did boot -- why do you think it didn't?
Can you temporarily attach a monitor to see what is happening?
by davidcoton
Thu Jun 20, 2019 8:20 am
Forum: General discussion
Topic: The correct "over_voltage" settings in RPI 2B for (Overclock )
Replies: 11
Views: 319

Re: The correct "over_voltage" settings in RPI 2B for (Overclock )

Try doing some research (Google) on overclocking Raspberrypi. There are many stress tests out there, cpuburn is one of the better known but there are others that stress the Pi hardware in particular. But if I may ask, why do you want to overclock if you don't have an application that will test the o...
by davidcoton
Thu Jun 20, 2019 7:17 am
Forum: General discussion
Topic: Display-o-tron HAT projects
Replies: 24
Views: 1247

Re: Display-o-tron HAT projects

pcmanbob wrote:
Thu Jun 20, 2019 7:13 am
You need to edit your code post and use edit [code] [/code] tags, rather than quote tags to preserve the indentation.
FTFY
by davidcoton
Tue Jun 18, 2019 8:22 pm
Forum: Beginners
Topic: 3v3 Relay with external power supply
Replies: 13
Views: 304

Re: 3v3 Relay with external power supply

- GND - It goes to the power supply and RPI's GND - RGND - No clue as to what this is There's insufficient info on the seller's page, so you will need to ask. But my (dangerous) guess is that the opto input ground is GND, and is separate from the relay driver ground (RGND). This means you have an e...
by davidcoton
Tue Jun 18, 2019 5:08 pm
Forum: General discussion
Topic: Raspberry Pi Zero W board - Deep Sleep Mode configuration and wake up
Replies: 3
Views: 159

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 are...
by davidcoton
Sun Jun 16, 2019 9:54 pm
Forum: Off topic discussion
Topic: Arduino connection to the PI (with 12C)
Replies: 18
Views: 2222

Re: Arduino connection to the PI (with 12C)

Going by the Blue one in the picture above +5V from the Pi needs to go to the HV terminal on the High Logic level side and the 3.3V from the Arduino needs to be connected to the LV terminal on low logic level side. That doesn't sound right, although it would work if the Arduino has a 3V3 supply. Pi...
by davidcoton
Sun Jun 16, 2019 9:50 pm
Forum: Off topic discussion
Topic: how heavy is raspbian ?
Replies: 30
Views: 1867

Re: how heavy is raspbian ?

Heater wrote:
Sun Jun 16, 2019 6:03 pm
Squeeze enough information into a small enough space and you create a black hole!
Is that why too much learning gives you a headache? :twisted:
by davidcoton
Sun Jun 16, 2019 5:00 pm
Forum: General discussion
Topic: Supplying 5v power to RPi & 120VAC to relays
Replies: 14
Views: 390

Re: Supplying 5v power to RPi & 120VAC to relays

@davidcoton thank you, that is good advice on people to consult. Before I release anything I would be certain to speak with such people. At the stage I'm at it may be a little premature and cost prohibitive. I'm really just trying to just get to a minimum viable product that can prove a business mo...
by davidcoton
Sun Jun 16, 2019 11:35 am
Forum: Advanced users
Topic: My UTC is 2 hours off:
Replies: 2
Views: 150

Re: Raspbian Jessie Systemctl TimeDateCtl replacement for NTP

My UTC is still 2 hours off: Local time: Sun 2019-06-16 11:00:00 CEST Universal time: Sun 2019-06-16 09:00:00 UTC RTC time: n/a Time zone: Europe/Amsterdam (CEST, +0200) ... Sorry, what is wrong with that? Assuming you grabbed that output just before posting, it is also consistent with the message ...
by davidcoton
Sat Jun 15, 2019 9:25 pm
Forum: General discussion
Topic: Supplying 5v power to RPi & 120VAC to relays
Replies: 14
Views: 390

Re: Supplying 5v power to RPi & 120VAC to relays

If you are creating a commercial project powered fom mains (other than a bought-in PSU), you need to take advice from a manufacturer or consultant familiar with your local product legislation. Here be dragons. You also need to check that you can meet the license requirements of all the installed sof...
by davidcoton
Wed Jun 12, 2019 10:13 pm
Forum: Troubleshooting
Topic: Fresh Stretch install - WiFi not working
Replies: 6
Views: 183

Re: Fresh Stretch install - WiFi not working

/etc/wpa_supplican/wpa_supplicant.conf contains what it should, in fact identical to the Wheezy vertion. What gives? Since Wheezy, wpa_supplicant has aquired an extra line defining the country, so as to enforce regional rules on WiFi channels. Does your version contain that? It might help to post t...
by davidcoton
Wed Jun 12, 2019 6:35 pm
Forum: General discussion
Topic: [Solved] Would the AC/DC adapter provided in the URL be enough for the PI 3b?
Replies: 5
Views: 196

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

Of course it will.
It's the "official" Raspberry Pi PSU, designed precisely for the purpose of powering Pis.
by davidcoton
Wed Jun 12, 2019 12:42 pm
Forum: Troubleshooting
Topic: wlan0: Not associated
Replies: 34
Views: 652

Re: wlan0: Not associated

ps -A | grep 'wpa' 502 ? 00:00:00 wpa_supplicant [email protected]:~ $ 379 ? 00:00:00 wpa_supplicant bash: 379: command not found sudo kill -9 379 Not sure if I should continue with the next command you asked me to put in as I think the second one could be teh problem. If you think I should put in las...
by davidcoton
Wed Jun 12, 2019 9:04 am
Forum: General discussion
Topic: Running an RPI outside?
Replies: 12
Views: 350

Re: Running an RPI outside?

To back up the info above: You MUST use an RCD at the source of an outdoor mains supply. You should look for a commercial IP67 enclosure for all the mains components. With care and a large case you can put the Pi in there too. Don't forget the drain hole -- no bigger than 2mm diameter, though, to st...
by davidcoton
Tue Jun 11, 2019 8:18 pm
Forum: General discussion
Topic: Toggle switch question?
Replies: 4
Views: 159

Re: Toggle switch question?

The diagram you show is a 2 pole 2 way (2P2W) or 2 pole changeover (2PCO) switch, which is extremely common. It can also be referred to as 2 pole "on-on". Edit: as noted by other contributors below, "2" can be "D" for double, and "W" can be "T" for throw, as in DPDT. 4 pole would have a total of 12 ...
by davidcoton
Tue Jun 11, 2019 8:58 am
Forum: Beginners
Topic: Is reboot safe?
Replies: 17
Views: 571

Re: Is reboot safe?

This sort of situation rarely occurs, typically when upgrading from one release to another (jessie to stretch, or stretch to buster), but as the general Raspbian way seems to be "start again with a new download", you'll almost never hit this scenario. While it occurs rarely it depends only on packa...
by davidcoton
Sun Jun 09, 2019 4:33 pm
Forum: General discussion
Topic: Packages installing in wrong folder in Raspberry pi 3
Replies: 5
Views: 237

Re: Packages installing in wrong folder in Raspberry pi 3

How did you install them? What commands did you use?
by davidcoton
Thu Jun 06, 2019 5:04 pm
Forum: Troubleshooting
Topic: Pi Zero W Heating Rapidly and Won't Boot
Replies: 5
Views: 411

Re: Pi Zero W Heating Rapidly and Won't Boot

Jake Scott wrote:
Thu Jun 06, 2019 12:57 pm
Is the heating a common error??
No, but not unheard of either.
Jake Scott wrote:
Thu Jun 06, 2019 12:57 pm
Can bad soldering kill a zero??
Yes, easily.

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