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by sparkyhall
Wed Jan 01, 2020 2:25 pm
Forum: Troubleshooting
Topic: RPi4 poweroff - still on?
Replies: 11
Views: 462

Re: RPi4 poweroff - still on?

The default boot loader config was changed some time ago so that the 3V3 now remains on after a system halt because some hats did not like having a 5V supply without 3V3. You can change back to the previous behaviour by changing the defaults for "WAKE_ON_GPIO" and "POWER_OFF_ON_HALT", for details se...
by sparkyhall
Tue Dec 31, 2019 4:28 pm
Forum: Troubleshooting
Topic: what would happen if wire a 5V battery to the 5VDC gpio pins of a rasbary pi 4
Replies: 12
Views: 390

Re: what would happen if wire a 5V battery to the 5VDC gpio pins of a rasbary pi 4

Are there extra procedures to prevent the pi from shorting You can use a Fuse or a Polyfuse for protection if you feed Power into GPIO. This need a Step-Down or a Step-Up Converter cause the floating voltage of batterys. You can for example use 6x 1.2V and feed this into XL4015 then into the Raspbe...
by sparkyhall
Wed Dec 25, 2019 5:28 pm
Forum: Troubleshooting
Topic: RPi 4 doesn't shutdown completely
Replies: 4
Views: 177

Re: RPi 4 doesn't shutdown completely

The default boot loader config was changed some time ago so that the 3V3 now remains on after a system halt because some hats did not like having a 5V supply without 3V3. See "WAKE_ON_GPIO" and "POWER_OFF_ON_HALT" in the following link: https://www.raspberrypi.org/documentation/hardware/raspberrypi/...
by sparkyhall
Mon Dec 16, 2019 9:03 pm
Forum: General discussion
Topic: Device not detected using i2c-detect y 1
Replies: 13
Views: 509

Re: Device not detected using i2c-detect y 1

3V3 pin to HDMI_metal shell = 3.3V is Correct 3v3 pin to Gnd = -1.79 suggests that your gnd is connected to 5V 5v0 pin to HDMI_metal shell = 0v suggests that your gnd is connected to 5V 5v0 pin to Gnd = 5v is correct and contradicts the readings above? It think it is time to check the continuity bet...
by sparkyhall
Sun Dec 15, 2019 9:03 am
Forum: General discussion
Topic: Doesn't the Raspberry case disturb the wifi signal?
Replies: 3
Views: 265

Re: Doesn't the Raspberry case disturb the wifi signal?

Yes, a metal case can have a negative impact on the WiFi signal. Given the number of variables (distance from router/AP, number of nearby routers in your area etc) it's not possible to say if this will be a problem for you. To give you an idea here is a link to a review of the Argon Neo with WiFi re...
by sparkyhall
Sun Dec 08, 2019 8:29 am
Forum: General discussion
Topic: Device not detected using i2c-detect y 1
Replies: 13
Views: 509

Re: Device not detected using i2c-detect y 1

With the sensor unplugged, the voltage measurement is 3.36v. When wired as shown below the voltage is 0.57v It's not going to work if the 3V3 measures 0.57V at the BME280, this is the area we need to focus on. What supplies the 3V3, is the Raspberry Pi or something else? What happens to the Raspber...
by sparkyhall
Mon Nov 25, 2019 9:45 am
Forum: General discussion
Topic: GPIO connection with ATmega328p
Replies: 9
Views: 300

Re: GPIO connection with ATmega328p

It'll be fine, just keep connecting cables as short as possible, I would go for < 150mm.
by sparkyhall
Mon Nov 25, 2019 8:48 am
Forum: General discussion
Topic: GPIO connection with ATmega328p
Replies: 9
Views: 300

Re: GPIO connection with ATmega328p

If you have configured the GPIO for internal pull-down then there is no need for the external pull-down resistors. The only thing you need to consider is is the internal 50k(ish) pull-down is enough for your use case.
by sparkyhall
Sun Nov 24, 2019 10:34 pm
Forum: Advanced users
Topic: DVFS Firmware
Replies: 71
Views: 8102

Re: DVFS Firmware

I just had a hard lock on mine after just over 2 hours of use., never done this before and I have been using this a few hours a day since July. This was with CPU overclock = 1800MHz and overvolt=2.

Will drop to default clock and overvolt and see how it goes.
by sparkyhall
Sun Nov 24, 2019 8:39 pm
Forum: Advanced users
Topic: DVFS Firmware
Replies: 71
Views: 8102

Re: DVFS Firmware

DVFS firmware working fine here. I normally run with a CPU overclock of 1800MHz and overvolt=2, this works fine with DVFS although I get 5 frequency steps (600, 720, 900, 1200 & 1800) I assume this is correct? The idle power consumption at the mains plug is now 3.0W instead of 3.3W, that's a 10% red...
by sparkyhall
Wed Nov 20, 2019 8:21 pm
Forum: General discussion
Topic: Thunder activated
Replies: 5
Views: 373

Re: Thunder activated

As others have suggested, detecting lightning may be the way to go. You can buy ready made break out boards for this, such as this one: http://www.embeddedadventures.com/as3935_lightning_sensor_module_mod-1016.html I have had one these for about a year and I plan to attach this to my Pi based weathe...
by sparkyhall
Sun Nov 10, 2019 9:00 am
Forum: General discussion
Topic: What is the maximum temperature of the CPU before it gets demaged ?
Replies: 21
Views: 1332

Re: What is the maximum temperature of the CPU before it gets demaged ?

Board orientation makes a difference, vertical seems best for cooling and I recall jahboater saying his was vertically mounted.
by sparkyhall
Thu Oct 24, 2019 5:37 pm
Forum: General discussion
Topic: Resource Monitor?
Replies: 3
Views: 507

Re: Resource Monitor?

Looks like Conky to me. You will need to spend time editing the config file to get it the way you want.You can find plenty of examples with a quick google search.
by sparkyhall
Sun Oct 20, 2019 7:50 am
Forum: General discussion
Topic: How to use an RPI 3B or 3B+ SD card in a RPI 4B?
Replies: 7
Views: 746

Re: How to use an RPI 3B or 3B+ SD card in a RPI 4B?

Record what you copied in case something goes wrong!! That way, if you need to re-flash the new SD card, you don't lose that time twice. Or better still place your commands in a Bash script, you can then re-run them all with a single command. I've not tried upgrading, as Raspian is based on Debian ...
by sparkyhall
Tue Oct 15, 2019 6:34 pm
Forum: Advanced users
Topic: Encrypted swap crashes all system
Replies: 31
Views: 1890

Re: Encrypted swap crashes all system

I wouldn't expect a full reboot, feels more like a hardware/power issue to me.

Or are you saying it crashes or locks up?
by sparkyhall
Mon Oct 07, 2019 7:24 pm
Forum: General discussion
Topic: Raspberry Pi in Grid Down situations
Replies: 8
Views: 527

Re: Raspberry Pi in Grid Down situations

You do know that you use alt+left mouse click and drag anywhere in a window to move it on most linux desktops?
by sparkyhall
Mon Oct 07, 2019 7:11 pm
Forum: General discussion
Topic: passive heatsink shell case
Replies: 15
Views: 872

Re: passive heatsink shell case

Hi Here is the link to the report I made to the seller. https://www.dropbox.com/s/xk4yxoqlid2ri79/RPi4_shell_case.pdf?dl=0 He didn't even reply, but fully refunded me, so I really think the case I got is faulty ! I see why you returned yours now. The one I bought has two separate raised profiles in...
by sparkyhall
Sun Oct 06, 2019 8:01 pm
Forum: General discussion
Topic: piRoot: A way to run x86 Debian apps on Raspbian
Replies: 89
Views: 7633

Re: piRoot: A way to run x86_64 Debian apps on Raspbian

Maybe ReactOS would be an alternative to Windows XP, I've never tried or used ReactOS though.

https://reactos.org/
by sparkyhall
Sat Oct 05, 2019 9:55 am
Forum: General discussion
Topic: Lost GUI after installing MHS35 3.5" tft screen
Replies: 6
Views: 383

Re: Lost GUI after installing MHS35 3.5" tft screen

Have you followed the instructions for switching back to hdmi on page 8 of the MHS35 user manual?

http://www.lcdwiki.com/res/MHS3528/MHS- ... ual_EN.pdf
by sparkyhall
Fri Oct 04, 2019 11:19 am
Forum: General discussion
Topic: passive heatsink shell case
Replies: 15
Views: 872

Re: passive heatsink shell case

Since people keep posting about that subject, I'm posting a "reviiew" of a passive heatsink shell case the "Passive Chinese" i had to do to explain the seller that its device can't work correctly. Here is the item https://www.ebay.fr/itm/For-Raspberry-Pi-4B-Protect-Box-CNC-Aluminum-Alloy-Case-Enclo...
by sparkyhall
Sun Sep 22, 2019 3:40 pm
Forum: General discussion
Topic: Backlight blanking
Replies: 9
Views: 445

Re: Backlight blanking

I found that I could turn my display backlight on/off using "tvservice -o" and "tvservice -p" on the pi4. You can then install xscreensaver to run the tvservice command at the appropriate times. sudo apt install xscreensaver xscreensaver includes the hook “xscreensaver-command -watch”, this reports ...
by sparkyhall
Sun Sep 22, 2019 2:23 pm
Forum: General discussion
Topic: RPI4 SD boot system on usb3stick slower then a sloth
Replies: 6
Views: 382

Re: RPI4 SD boot system on usb3stick slower then a sloth

Have you remembered to update the PARTUUID in both /boot/cmdline.txt and /etc/fstab to the PARTUUID for your USB stick?

I seem to remember similar behaviour when I forgot to update one or the other.
by sparkyhall
Thu Sep 19, 2019 6:05 pm
Forum: General discussion
Topic: Armor case question
Replies: 10
Views: 495

Re: Armor case question

I have an Amor style case I bought on ebay, the gap between the CPU and the raised part of the cased measured just under 1.2mm and the pads that came with it were 1.3mm. I used a 1.2mm piece of aluminium and thermal paste on mine. Having said that I'm sure mine had a gap between the two raised parts...
by sparkyhall
Wed Sep 18, 2019 7:16 pm
Forum: General discussion
Topic: latest rpi-update 2.5ghz with 4B 4g
Replies: 44
Views: 5635

Re: latest rpi-update 2.5ghz with 4B 4g

pi-tastic wrote:
Wed Sep 18, 2019 3:20 pm
we should do an energy consumption test @ those numbers how much extra is it eating?
i have the official psu and i notice at 1.9/2ghz it gets hotter!.
On my Pi4 the 5V supply current at default clock is 1A at 100% CPU load, at 2GHz it is 1.5A, an increase of 2.5W.

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