Go to advanced search

by davidcoton
Thu Jan 17, 2019 1:21 pm
Forum: Troubleshooting
Topic: Pi Zero W built in wifi doesn't work , wifi dongle does
Replies: 5
Views: 50

Re: Pi Zero W built in wifi doesn't work , wifi dongle does

DirkS wrote:
Thu Jan 17, 2019 12:19 pm
And your wpa_supplicant (as @davidcoton requested)?
It's embedded within the quote of my post :evil:
However it looks correct, unless the SSID is hidden by the router.
by davidcoton
Thu Jan 17, 2019 1:17 pm
Forum: Troubleshooting
Topic: Raspberyy Pi 3 B+: not booting and no green light!
Replies: 5
Views: 85

Re: Raspberyy Pi 3 B+: not booting and no green light!

If you are measuring correctly, you have no 3V3. What about the 5V?
by davidcoton
Thu Jan 17, 2019 11:23 am
Forum: General programming discussion
Topic: What am I doing wrong?
Replies: 1
Views: 33

Re: What am I doing wrong?

  1. Edit your post to put [code]...[/code] tags round your program. Then the indentation shows and the program will make sense. 8-)
  2. Tell us exactly what error messages you are getting. No-one here can use a crystal ball. :o
by davidcoton
Thu Jan 17, 2019 11:08 am
Forum: Troubleshooting
Topic: Raspberyy Pi 3 B+: not booting and no green light!
Replies: 5
Views: 85

Re: Raspberyy Pi 3 B+: not booting and no green light!

Two possibilities: The PSU cannot supply enough current while maintaining 5V. That would account for the red LED going out. The board is faulty (google PMIC on this site). In either case, if you have a multimeter, measure carefully the voltage on Pin 2 on the GPIO header. Do NOT short any pins -- if...
by davidcoton
Thu Jan 17, 2019 10:56 am
Forum: Troubleshooting
Topic: Pi Zero W built in wifi doesn't work , wifi dongle does
Replies: 5
Views: 50

Re: Pi Zero W built in wifi doesn't work , wifi dongle does

stromberg wrote:My wpa_supplicant.conf file has correct information
You may be right, but post it here (edit out the passphrase) just in case.

Also, what does

Code: Select all

cat /proc/device-tree/model
return? (Some Pis have excaped production with the wrong hardware version programmed.)
by davidcoton
Wed Jan 16, 2019 11:11 pm
Forum: Troubleshooting
Topic: Soild Red light on boot and rainbow screen PI3 A+
Replies: 1
Views: 36

Re: Soild Red light on boot and rainbow screen PI3 A+

What OS are you trying to use? And when was it downloaded? You need an image that is more recent than the Pi3A+ release.

Try downloading the latest aspbian (Desktop with s/w, desktop, or lite), use Etcher to copy it to the SDCard, and test again.

See also the Boot Problems Sticky thread.
by davidcoton
Wed Jan 16, 2019 9:52 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2174

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

What can you recommend that is comparable to RPi in size, capabilities, reasonable price and especially stability? Nothing, because: This is a Pi forum, run bu RPF/T, so discussion of rival products is discouraged. Security costs money (haven't you got that message yet?) and therefore products at t...
by davidcoton
Wed Jan 16, 2019 6:29 pm
Forum: Troubleshooting
Topic: Pi 3B+ stops working
Replies: 24
Views: 847

Re: Pi 3B+ stops working

Well, I guess I am gonna have to buy a new one. Just in case, could it be a manufacture deffect? If you are sure you did not short anything, especially 3V3 to 5V, but could just be GPIO to a supply rail, then it is probably a defect covered by warranty. Talk to your supplier. RPT have said there is...
by davidcoton
Wed Jan 16, 2019 6:09 pm
Forum: General discussion
Topic: Pi 3b+ lost Capacitor on PCB
Replies: 16
Views: 853

Re: Pi 3b+ lost Capacitor on PCB

... they're just small decoupling caps that were found to be unnecessary and therefore removed from the BOM. There are also at least four around the PMIC also removed. I wonder how it's determined that they're unnecessary. Does someone take a representative sample of boards - say, a thousand - and ...
by davidcoton
Tue Jan 15, 2019 3:43 pm
Forum: General discussion
Topic: what charger from this two?
Replies: 7
Views: 491

Re: what charger from this two?

ok i will buy the original charger. But do you think is safe (for the PI), if i try it with one of these chargers to see if it works or not? Probably, the higher voltage outputs should only be active if the device requests it, and the Pi won't (can't). But I can't (won't) guarantee that! :shock:
by davidcoton
Tue Jan 15, 2019 3:11 pm
Forum: General discussion
Topic: what charger from this two?
Replies: 7
Views: 491

Re: what charger from this two?

2 or 3 might work, bur save yourself trouble and pasin. Get the "official" RPi 5V1 2A5 supply, which is known to work well in almost all circumstances.
by davidcoton
Mon Jan 14, 2019 8:16 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2174

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

Can you explain why this little code change for future devices would cost large sums of money? Because it is almost certain that the design of whatever will become the Pi4 is already at an advanced stage, so it would have to be taken back to an earlier stage and reworked. If the Pi4 is based on exi...
by davidcoton
Mon Jan 14, 2019 7:13 pm
Forum: Troubleshooting
Topic: Static shock causing false GPIO detection
Replies: 14
Views: 314

Re: Static shock causing false GPIO detection

With 10nF (try that first) or 100nF it's not essential. But still good practice to put 1K in series with the GPIO input in case of accidental programming as an output. You don't want a resistor directly in series with the capacitor across the switch.
by davidcoton
Mon Jan 14, 2019 7:05 pm
Forum: Beginners
Topic: NoIR v2 interfaced directly to 720P display
Replies: 3
Views: 90

Re: NoIR v2 interfaced directly to 720P display

Phase one, probably fairly straightforward. Phase two, just because the displays have a ribbon cable, does not mean you can connect therm to the Pi's DSI connector. The Pi DSI interface is proprietary, it can only be connected to the RPi 7" touchscreen (and possibly one other screen which may have r...
by davidcoton
Sun Jan 13, 2019 9:40 pm
Forum: Troubleshooting
Topic: Raspbian stuck on screen with cursor+black screen+yellow lightning during boot
Replies: 3
Views: 90

Re: Raspbian stuck on screen with cursor+black screen+yellow lightning during boot

Your PC's USB may be limited to 500mA. The Pi3B+ can draw over twice that. Get a proper 5V-5V2 2A5 PSU (not a repurposed charger), preferably the "official" 5V1 2A5 PSU which is known to be of good quality. Make sure the cable, if separate, is adequate -- at least 22AWG and preferanbly 18AWG wires (...
by davidcoton
Sun Jan 13, 2019 9:33 pm
Forum: Troubleshooting
Topic: Static shock causing false GPIO detection
Replies: 14
Views: 314

Re: Static shock causing false GPIO detection

us3rnotfound wrote:
Sun Jan 13, 2019 2:43 pm
So should I try to solder a 100nF cap to the switch? That would be the easiest for me since the lugs are exposed.
Yes
by davidcoton
Sun Jan 13, 2019 6:27 pm
Forum: General discussion
Topic: PSA(Public Service Announcment) USE APT instead of APT-GET
Replies: 3
Views: 315

Re: PSA(Public Service Announcment) USE APT instead of APT-GET

I dug into this some time ago, when apt was first available. From memory, the differences are deep down, where the default behaviour of apt has been tuned for interactive use. apt-get is tuned for batch use and has been retained to avoid breaking scripts. There are minor syntax changes, for example:...
by davidcoton
Sat Jan 12, 2019 9:24 pm
Forum: Troubleshooting
Topic: Static shock causing false GPIO detection
Replies: 14
Views: 314

Re: Static shock causing false GPIO detection

us3rnotfound wrote:
Sat Jan 12, 2019 6:00 pm
I understand I should try and add a 10nF or 100nF capacitor to stop this quick discharge from turning on the Pi. Where should I add it?
Any capacitor added to remove stray pickup should be in parallel withthe switch contacts.
by davidcoton
Fri Jan 11, 2019 9:25 pm
Forum: General discussion
Topic: raspberry pi 12.75W power supply use
Replies: 8
Views: 259

Re: raspberry pi 12.75W power supply use

See the review tab on the product page linked above. Seller claims "US Official" but it appears not to be linked to RPT at all.
by davidcoton
Thu Jan 10, 2019 5:27 pm
Forum: Troubleshooting
Topic: School Project- Joke Bin: PIR Sensor not responding
Replies: 11
Views: 189

Re: School Project- Joke Bin: PIR Sensor not responding

Check with https://pinout.xyz/#. From the photo I think you are counting pins from the wrong end of the GPIO connector.
Pins 4 (5V), 6 (GND) and 11 (BCM17) are all near the SDCard end.
by davidcoton
Thu Jan 10, 2019 4:16 pm
Forum: General discussion
Topic: house heating system
Replies: 29
Views: 735

Re: house heating system

And are you A professional? Yes, degree in Electrical Engineering and professional electrician's qualifications (registered NICEIC Approved Contractor). Over ten years running my own Electrician's business. What is arcane, complex, or incomprehensible about an on/off thermsotat? Nothing. But keepin...
by davidcoton
Thu Jan 10, 2019 2:34 pm
Forum: General discussion
Topic: house heating system
Replies: 29
Views: 735

Re: house heating system

No-one has made the suggestion that anyone should go ahead with anything when they have "no real idea of what they were doing". Thank you for that clarification. The problem is (was), that your statements about the "simplicity" of heating controls could mislead people into taking on something they ...
by davidcoton
Thu Jan 10, 2019 2:29 pm
Forum: General discussion
Topic: About making GUI
Replies: 12
Views: 336

Re: About making GUI

This is probably the bit that I was missing. Would it then be better to: Start digging straight into databases like MySQL and whatnot? or Making little steps with other methods that add less overhead? Either... Databases have their own language and that you will need to learn. Skills such as writin...
by davidcoton
Thu Jan 10, 2019 10:21 am
Forum: Off topic discussion
Topic: Why Avoid BASIC on RPi?
Replies: 1252
Views: 38559

Re: Why Avoid BASIC on RPi?

Heater wrote:
Thu Jan 10, 2019 12:53 am
Fourteen hours later, after disk full, out of memory and many beers, we have...clang!
...
Now to do same on Raspi...
Just make sure you don't drop a clanger :lol:
by davidcoton
Wed Jan 09, 2019 4:08 pm
Forum: General discussion
Topic: About making GUI
Replies: 12
Views: 336

Re: About making GUI

... So far I can say that I have to understand each element of a LAMP stack for my project to work. However, I've been wondering if each electronic device works like that. Does a printer stores it's settings in a database so it "remembers" the users parameters? I'm at this point where I don't know ...

Go to advanced search