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by davidcoton
Mon Jul 16, 2018 9:14 pm
Forum: Troubleshooting
Topic: Pi 3B+ / Shorting 3.3V to GND
Replies: 14
Views: 302

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

But the chip’s “delicate internal” must have a melting threshold, right ? If the fuse’s rating is below, couldn’t it work ? Long ago when discrete transistors were "state of the art", they were known as "three legged fuses". Semiconductors will fail long before a fuse or circuit breaker even begins...
by davidcoton
Mon Jul 16, 2018 8:48 am
Forum: Beginners
Topic: Can I using wi-fi connect two pi's together without a hotspot?
Replies: 13
Views: 257

Re: Can I using wi-fi connect two pi's together without a hotspot?

hamilc wrote:
Mon Jul 16, 2018 3:19 am
Can I program two pi so listen to a specific (but different) 168.100.???.??? adresss
Note that the address range should be 192.168.???.???
168.100.???.??? will be allocated to someone else
by davidcoton
Sun Jul 15, 2018 10:50 pm
Forum: General discussion
Topic: Power Cable with switch
Replies: 16
Views: 408

Re: Power Cable with switch

Must be a country specific thing then because in Australia, the official power supply only has two prongs. It is. The UK standard required a shutter over the live socket holes, the earth (ground) pin is used to open the shutter. So the earth pin must be present. On moulded "Wall Wart" PSUs that are...
by davidcoton
Sun Jul 15, 2018 11:25 am
Forum: Troubleshooting
Topic: Raspberry pi 3 b+ won't boot with multiple SD cards
Replies: 7
Views: 147

Re: Raspberry pi 3 b+ won't boot with multiple SD cards

It did get very hot before it stopped working. If it does get very hot (that is, too hot to touch comfortably) then it is probably dead. It can be difficult to determine why -- short circuits on the GPIO or metal objects contacting the board are likely causes, but that doesn't mean it was the probl...
by davidcoton
Sat Jul 14, 2018 9:52 am
Forum: Beginners
Topic: Need to provide network/internet access via wireless connection
Replies: 4
Views: 114

Re: Need to provide network/internet access via wireless connection

I assume you mean you want to add WiFi to your Pi, to use the existing wireless network from your router. Which model Pi? Pi0W, Pi0WH, Pi3B and Pi3B+ all have wireless built in. Other consumer Pis can have a wireless dongle plugged into USB, on some models an extra USB hub is required. Some dongles ...
by davidcoton
Fri Jul 13, 2018 7:16 pm
Forum: Beginners
Topic: Send Command from Raspberry Pi Zero to USB C
Replies: 6
Views: 144

Re: Send Command from Raspberry Pi Zero to USB C

So how do you recommend to proceed? Checking whether linux recognizes the GH5, then trying to send the commands from a linux machine? And as soon as i got this working trying to implement these commands with the raspberry? The Raspberry (running Raspbian) IS a Linux machine. So that's one extra ste...
by davidcoton
Fri Jul 13, 2018 7:09 pm
Forum: Beginners
Topic: Serial connection troubleshooting
Replies: 10
Views: 267

Re: Serial connection troubleshooting

lmarmisa wrote:
Fri Jul 13, 2018 1:06 pm
This python 2 script should work...
No, it won't.
nosoup wrote:The serial interface (RS232) settings are 9600 N 8 1.
So you have the wrong baudrate in your code.
Sorry if that is pedantic and obvious to everyone.
by davidcoton
Wed Jul 11, 2018 11:10 pm
Forum: Troubleshooting
Topic: Git clone and apt not working.
Replies: 15
Views: 384

Re: Git clone and apt not working.

If you wish to use a fixed IP address for your Pi (which is often a good idea), have the router assign it (based on the Pi's MAC address, which the router can usually display). Fixing the IP address at the device level is a recipe for (at best) confusion. +1. There are three possibilities as to wha...
by davidcoton
Wed Jul 11, 2018 10:58 pm
Forum: Advanced users
Topic: QT3 for Raspbian Stretch
Replies: 5
Views: 164

Re: QT3 for Raspbian Stretch

Raspbian Jessie will run on a 3B+ if it is fully updated first on a previous model RPi ! I don't think that is entirely so. Make a backup copy of your Jessie SDCard. On an older Pi, try: sudo apt update sudo apt full-upgrade rpi-update That should (possibly) be bootable on an Pi3B+, but there might...
by davidcoton
Wed Jul 11, 2018 5:18 pm
Forum: Beginners
Topic: Only 0.01V on the 3.3V pin and fails to boot
Replies: 6
Views: 233

Re: Only 0.01V on the 3.3V pin and fails to boot

Many voltages for AC mains are specified as a range for many power supplies, I would then expect any DC voltage from a DC power supply, unless regulated, to generate the DC voltage within some range. The range that the PSU will tolerate on its input is not connected to the output voltage, because a...
by davidcoton
Tue Jul 10, 2018 8:30 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 Model B+ - Under-voltage warnings [SOLVED]
Replies: 14
Views: 3308

Re: Raspberry Pi 3 Model B+ - Under-voltage warnings [SOLVED]

So are you running Raspbian Jessie on a Pi3b+? How, Jessie is not supported, you require at least the march/april release of Raspbian Stretch for your Pi3b+ to boot. A Pi3B+ will boot Jessie with the appropriate previous "treatment" -- IIRC a sufficiently recent kernel update from rpi-update. Not s...
by davidcoton
Tue Jul 10, 2018 8:15 pm
Forum: General discussion
Topic: Thinking of writing a technical FAQ
Replies: 53
Views: 1249

Re: Thinking of writing a technical FAQ

Top of the list: Why won't my Pi boot?
Just needs links to the three standard (much linked) resources.
by davidcoton
Mon Jul 09, 2018 9:30 pm
Forum: Troubleshooting
Topic: Moving SDCard from PI2 to PI 3 B+
Replies: 4
Views: 133

Re: Moving SDCard from PI2 to PI 3 B+

The PI 3 B+ boots and works fine off a newly created Jessie image, so I know the hardware is fine. Really? The Jessie image is usually too old for a Pi3B+, unless (IIRC) you jump through the rpi-update hoop. The current image is Stretch, is that what you actually have? That would be expected to wor...
by davidcoton
Mon Jul 09, 2018 8:44 am
Forum: General discussion
Topic: Setting a static IP address from SD card before boot
Replies: 17
Views: 503

Re: Setting a static IP address from SD card before boot

Although directly setting static IP numbers in each device doesn't scale well beyond about 50 devices, learning something simple before attempting a more complicated setup may lead to a gentler learning curve from an educational point of view. I disagree entirely. In my experience setting static IP...
by davidcoton
Sun Jul 08, 2018 7:58 pm
Forum: General discussion
Topic: booting up Raspberry Pi 3 from and external USB HDD
Replies: 16
Views: 527

Re: booting up Raspberry Pi 3 from and external USB HDD

The LED light does stay on. I'm surprised. The USB spec only requires 0A5 maximum current, which is not always enough for a Pi alone. Your laptop obviously does better. The USB HDD does not have a power supply. Its like any other USB HDD which you simply plugin directly to the machine. Many USB HDD...
by davidcoton
Sun Jul 08, 2018 7:48 pm
Forum: Beginners
Topic: Stretch: clean-up after package upgrade or remove
Replies: 5
Views: 171

Re: Stretch: clean-up after package upgrade or remove

AIUI the recommendation for command-line (interactive) use is that apt should replace apt-get in all(?) commands. The apt versions are optimised for that.
There may be some advantage (particularly compatibility) in retaining apt-get in scripts.
by davidcoton
Sun Jul 08, 2018 7:39 pm
Forum: General discussion
Topic: IP6x case highish temperature ambient
Replies: 9
Views: 237

Re: IP6x case highish temperature ambient

Would it be possible to use one Pi to collect data, send it by Ethernet or WiFi to a second Pi in a cooler location to be stored on the HDD?
by davidcoton
Sun Jul 08, 2018 10:48 am
Forum: Beginners
Topic: Can i use this phone charger as power adapter?
Replies: 3
Views: 142

Re: Can i use this phone charger as power adapter?

From a look at the web page, it seems the default output is 5V at up to 2A -- while this might work, the recommended supply for a Pi3B+ is 2A5. They seem to claim that the supply is a stable 5V at 2A, this is not always the case for chargers, many will drop voltage when supplying maximum current. Th...
by davidcoton
Sun Jul 08, 2018 8:16 am
Forum: General discussion
Topic: IP6x case highish temperature ambient
Replies: 9
Views: 237

Re: IP6x case highish temperature ambient

Look at the FLIRC metal Pi case as a starting point (I'm not sure if it works with Pi B rather than the Pi2 and Pi3 models), bolt that to the inside of a metal case with a heatsink on the outside. I thought about that, though it would definitely need a new Pi - Pi B has a different set of connector...
by davidcoton
Sun Jul 08, 2018 8:12 am
Forum: General discussion
Topic: booting up Raspberry Pi 3 from and external USB HDD
Replies: 16
Views: 527

Re: booting up Raspberry Pi 3 from and external USB HDD

Power supply (coming from a laptop) I see a red light and the fan running (so it has started up) but i don't see any output on the monitor. Is microSD mandatory to boot? I was hoping to boot (and install OS) on the external USB HDD. Does the red LED stay on? It should not flicker at all. If not, th...
by davidcoton
Sat Jul 07, 2018 9:51 pm
Forum: Beginners
Topic: DIY Pi Laptop Screen and Pi Power Supply
Replies: 7
Views: 176

Re: DIY Pi Laptop Screen and Pi Power Supply

The powerbank i was planning to use (with 2 usb outputs) says : "outputs : both 5V 3,1A (Max)". That is open to interpretation. If you are lucky it means "Both outputs 5V. Each output 3.1A Max". That will work, just, with a 5V to 7V converter. More likely it means "Both outputs 5V, combined total 3...
by davidcoton
Sat Jul 07, 2018 9:37 pm
Forum: General discussion
Topic: IP6x case highish temperature ambient
Replies: 9
Views: 237

Re: IP6x case highish temperature ambient

The critical temperature is that inside the SOC, which you want to keep below 80°C to avoid throttling. With an ambient temperature of 50°C, that is quite a difficult task. Ideally use a Pi3B+ because of its improved thermal performance. Ideally you need metal all the way from the SOC to an external...
by davidcoton
Sat Jul 07, 2018 9:11 pm
Forum: General discussion
Topic: Relay Module KY-019 5V
Replies: 192
Views: 8670

Re: Relay Module KY-019 5V

What you might consider, particularly if your project is portable, is a mains plug incorporating an RCD.
An additional MCB is a bit over the top, you have plenty of fuses everywhere and they fail safe (never heard of problems caused by fuse failure when the proper fuse has been used).
by davidcoton
Wed Jul 04, 2018 11:01 pm
Forum: Troubleshooting
Topic: I locked myself out of the GUI
Replies: 11
Views: 237

Re: I locked myself out of the GUI

If you can read and write the boot partition of your SDCard on another compuiter (even Windows will do), you can provide an updated wpa-supplicant.conf with the new WiFi details. If you have an Ethernet port, you can plug that to your router (most have some Ethernet ports as well as WiFi), which wil...
by davidcoton
Wed Jul 04, 2018 10:00 pm
Forum: Troubleshooting
Topic: RPI2 temperature going haywire (past 100c)
Replies: 5
Views: 180

Re: RPI2 temperature going haywire (past 100c)

Imperf3kt wrote:
Wed Jul 04, 2018 9:19 pm
If you use something flammable, like cardboard, as a case, you need to get it to over 400℃ before it can ignite.
Sources vary. But generally for paper 218–246℃ (424–475°F), so over 400°F which seems to be misquoted as over 400℃ in other sources
Note Ray Bradbury's "Farenheit 451".

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