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by rpdom
Thu Sep 19, 2019 9:16 pm
Forum: General discussion
Topic: Code issue
Replies: 3
Views: 102

Re: Code issue

thomaseharrison wrote:
Thu Sep 19, 2019 7:16 pm
I know the gpio pins are configured different but I’ve got them wired up right I’m pretty sure!
The GPIO pins on the Pi 3 are exactly the same as on the Zero. The only thing that has changed is the base address in memory, and unless you are doing very low-level stuff that shouldn't affect you.
by rpdom
Thu Sep 19, 2019 7:18 pm
Forum: Troubleshooting
Topic: Unable to view the desktop
Replies: 4
Views: 83

Re: Unable to view the desktop

You do not need to format the card prior to using Etcher to write Raspbian to the card.

Also, ignore what Windows or you phone may say about the second drive. It is not corrupted and does not need formatting. That is the Linux partition where all the main OS files are stored.
by rpdom
Thu Sep 19, 2019 10:32 am
Forum: Other
Topic: [ubuntu] Getting CPU tempature on Ubuntu
Replies: 8
Views: 182

Re: Getting CPU tempature on Ubuntu

Pimaxin wrote:
Thu Sep 19, 2019 9:17 am
mallets wrote:
Thu Sep 19, 2019 4:02 am

Code: Select all

cat /sys/class/thermal/thermal_zone0/temp
works for me. I'm still searching for the CPU freq value though.
What’s 38459 supposed to mean?
If that is the value returned from that command for you, it means your CPU temperature is currently 38.459°C
by rpdom
Thu Sep 19, 2019 7:57 am
Forum: Other projects
Topic: Idea for an led strip shirt
Replies: 5
Views: 110

Re: Idea for an led strip shirt

Imperf3kt wrote:
Thu Sep 19, 2019 7:50 am
Despite being powered by two AA batteries, the shock was very painful.
Not surprising. EL stuff tends to be high-voltage high-frequency low-current. The high pitched noise is from the inverter circuit that bumps the 3V output from the batteries to the 90-120V AC that the EL wires need.
by rpdom
Thu Sep 19, 2019 7:41 am
Forum: Troubleshooting
Topic: Can fstab be adjusted for time delay when spin-up of disk takes longer ?
Replies: 4
Views: 125

Re: Can fstab be adjusted for time delay when spin-up of disk takes longer ?

Unless you plan to use the external disk with a Windows or similar system, it would be better to reformat the partition as ext4. That will give you full Linux control over the permissions on the files and will be much faster than NTFS. If you are going to use NTFS format, don't use "ntfs" in fstab. ...
by rpdom
Thu Sep 19, 2019 6:39 am
Forum: Other projects
Topic: Idea for an led strip shirt
Replies: 5
Views: 110

Re: Idea for an led strip shirt

Some random thoughts that may help you: The heaviest thing will be batteries. You'll need quite a lot of power to drive all of those LEDs. A Pi Zero might be able to handle the driving part and will be light and low power. If it is a Zero W it could be updated or controlled remotely. How long do you...
by rpdom
Thu Sep 19, 2019 6:23 am
Forum: Troubleshooting
Topic: Pi rejects to reboot and always needs 3-30s cooldown
Replies: 5
Views: 160

Re: Pi rejects to reboot and always needs 3-30s cooldown

Are you switching off at the wall socket, or unplugging the power supply from the Pi? The PSU will have capacitors that hold a voltage for a few seconds and that may be enough to confuse the power management chip on the Pi. Generally with any electronic equipment you should always completely remove ...
by rpdom
Wed Sep 18, 2019 4:42 pm
Forum: Advanced users
Topic: Moving the microSD Card between RPi Zero W and RPi Zero
Replies: 7
Views: 132

Re: Moving the microSD Card between RPi Zero W and RPi Zero

Indeed. Many's the time I've take the hard drive out of one Linux PC and dropped it into another Linux PC with no work needed at all. Even laptop to desktop.
by rpdom
Wed Sep 18, 2019 12:02 pm
Forum: Troubleshooting
Topic: USB Blown is there any USB output on GP10.
Replies: 14
Views: 287

Re: USB Blown is there any USB output on GP10.

No, the USB bus is not available on the GPIO.
by rpdom
Tue Sep 17, 2019 9:50 pm
Forum: Beginners
Topic: GPIO pin to trigger 555 astable circuit
Replies: 4
Views: 99

Re: GPIO pin to trigger 555 astable circuit

Regarding the flashing LED, my thoughts are that hardware will be better that software in this case. To do it in software I will need to spawn a separate thread with its own loop, turning the LED on and off The RPi is not exactly a powerful device. I will already have 2 threads running - one for th...
by rpdom
Mon Sep 16, 2019 4:40 pm
Forum: Advanced users
Topic: Image File Utilities
Replies: 22
Views: 1651

Re: Image File Utilities

Fix the Forum so that posts can be deleted. Never done this personally, but I think you can flag your own post and tell the moderator you want it deleted. Hmmm... I've never had any issues deleting my own posts! That's what the garbage can icon does... You can delete them until someone makes anothe...
by rpdom
Mon Sep 16, 2019 6:08 am
Forum: Troubleshooting
Topic: Endless Wifi / WPA_Supplicant reconnect loop
Replies: 5
Views: 194

Re: Endless Wifi / WPA_Supplicant reconnect loop

Seems I solved it... dhclient was interfering with interfaces config. I thought, dhclient would ignore interfaces when configured as dhcp but it ignores everything if any interface is flagged as dhcp in interfaces config. I removed all dhcp config from interfaces and that it worked... Strange thoug...
by rpdom
Mon Sep 16, 2019 5:59 am
Forum: General discussion
Topic: use LDR in IR lamp
Replies: 1
Views: 63

Re: use LDR in IR lamp

Not without additional circuitry.
by rpdom
Mon Sep 16, 2019 5:46 am
Forum: HATs and other add-ons
Topic: PoE hat backfeed protection
Replies: 3
Views: 121

Re: PoE hat backfeed protection

I'd wait for confirmation from a Raspberry Pi Engineer, but I'm pretty certain it has been said that the HAT will not have any problems if the Pi receives a 5V supply from somewhere else.
by rpdom
Mon Sep 16, 2019 5:24 am
Forum: Beginners
Topic: Question Powering 4x Raspberry Pi Zeros with 1 power supply
Replies: 1
Views: 72

Re: Question Powering 4x Raspberry Pi Zeros with 1 power supply

All you need is a power supply that will give a steady 5V (or close enough) at up to about 2A (higher would be fine, but there is no need for it. 1A will work with no other peripherals connected) and you should be fine. There are no fuses or other protection circuity on the Zero (to keep the cost do...
by rpdom
Mon Sep 16, 2019 5:12 am
Forum: Beginners
Topic: Soldering
Replies: 22
Views: 478

Re: Soldering

LTolledo wrote:
Mon Sep 16, 2019 12:51 am
its a DIY arduino nano...
Nice work. :)
by rpdom
Sun Sep 15, 2019 7:21 pm
Forum: General discussion
Topic: Tracking sound location and getting there
Replies: 3
Views: 89

Re: Tracking sound location and getting there

The Yellies were just an example, and they do move towards the sound when not doing other things.

There are some simple microphone sensors for the Pi. I don't know how directional they are or can be made, I have one but haven;t got around to trying it yet.
by rpdom
Sun Sep 15, 2019 6:53 pm
Forum: General discussion
Topic: Tracking sound location and getting there
Replies: 3
Views: 89

Re: Tracking sound location and getting there

Probably can be done with a few simple sensors.

There are toy spiders that do a similar thing. Do a web search on "Yellies" ("Bo Dangles" and "Toothy Spooder" are two of the ones available).
by rpdom
Sun Sep 15, 2019 6:48 pm
Forum: Beginners
Topic: Pi 3 Model B GPIO Questions
Replies: 6
Views: 131

Re: Pi 3 Model B GPIO Questions

Is that the only code needed? Yes. I used this article as a bit of bedtime reading, and they use a different method with a lot of code https://howchoo.com/g/mwnlytk3zmm/how-to-add-a-power-button-to-your-raspberry-pi I've no idea why they decided to use their own code instead of the built-in stuff.
by rpdom
Sun Sep 15, 2019 12:30 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 440

Re: SCART RGB output to old TV set

Have you tried wiring an RCA plug to the composite TV header on your Zero? I haven't tried that, it might be an interesting test. But the reason for all the VGA palaver is to get an RGB signal working, which gives a much higher quality picture than composite. Also sound, which isn't available on th...
by rpdom
Sun Sep 15, 2019 11:10 am
Forum: Troubleshooting
Topic: [Not getting my full Gigabit internet speed on RPI 4b 4GB]
Replies: 15
Views: 374

Re: [Not getting my full Gigabit internet speed on RPI 4b 4GB]

DougieLawson wrote:
Sun Sep 15, 2019 9:24 am
Cubuss wrote:
Sun Sep 15, 2019 2:21 am
Bumping this up
You posted at half past eight at night, you bumped at twenty past three in the morning.
At a weekend too.
by rpdom
Sun Sep 15, 2019 10:50 am
Forum: Troubleshooting
Topic: Mount usb drive changes access permission of mount point to root
Replies: 6
Views: 133

Re: Mount usb drive changes access permission of mount point to root

The biggest mystery is why ntfs-3g isn't included in Raspbian by default, that would stop all these NTFS threads appearing on here. I wish I knew where to ask for that. Because the majority of Pi users don't need NTFS support and it would make the downloads bigger. Also, as I understand, the free v...
by rpdom
Sun Sep 15, 2019 7:16 am
Forum: Beginners
Topic: Pi 3 Model B GPIO Questions
Replies: 6
Views: 131

Re: Pi 3 Model B GPIO Questions

Don't use the RUN pins for shutdown/reboot. They are like the Reset button on a PC and will cause an instant reset of the Pi - losing anything that is being written to disk/card at the time and causing corruption of the file system. It is possible to connect a switch to pins 5 and 6 on the GPIO head...
by rpdom
Sun Sep 15, 2019 7:07 am
Forum: Beginners
Topic: Am I running 32 or 64 bit ?
Replies: 9
Views: 347

Re: Am I running 32 or 64 bit ?

Why Raspbian is always "delivered" with an old? / strange version of Arduino (Arduino 2:1.0.5+dfsg2-4.1) instead of the present one Arduino 1.8.10 ? Ask the Debian people. Raspbian is basically the current Debian system recompiled to work on the Pi 1 with a few optimisations, plus some extra Pi spe...
by rpdom
Sun Sep 15, 2019 6:47 am
Forum: General discussion
Topic: Raspberry Pi4 bootloader update package
Replies: 54
Views: 3230

Re: Raspberry Pi4 bootloader update package

I'm left wondering what is this the official Raspberry Pi foundation answer to this issue? They still haven't replied to this issue. Are they going to fix it or not? Did you read the documentation on the link provided? It gives clear instructions on how to read the configuration on the current imag...

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