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by wh7qq
Tue Nov 21, 2017 4:56 pm
Forum: Other
Topic: Chromium OS on RPi Zero
Replies: 4
Views: 67

Re: Chromium OS on RPi Zero

If you search on google or duck duck go for "Chrome OS Raspberry Pi" there are quite a few posts on this topic. I can't speak for any of them, if they are real or complete or are a simple "download, burn and run" process. BTW, Chromium OS or Chrome OS are not the same thing as Chromium which is simp...
by wh7qq
Sat Nov 11, 2017 7:47 pm
Forum: General discussion
Topic: I'm a beginner to raspberry pi
Replies: 2
Views: 157

Re: I'm a beginner to raspberry pi

Sorry, but it would be too time consuming to go through your list of possibles but short of that, this is what you need: It is possible to set the RPi up headless, that is with no support from monitor, keyboard or mouse, so potentially you need nothing but a power supply, an ethernet or wireless con...
by wh7qq
Sat Nov 11, 2017 6:53 pm
Forum: Troubleshooting
Topic: Slow internet on Pi
Replies: 4
Views: 161

Re: Slow internet on Pi

As you don't have problems with other downloads, web pages, etc. , the RPi is performing normally. The problem may be with web or repository congestion and you might find that another mirror gives better results. I don't know how to find/select other sites for Raspbian but I seem to recall seeing po...
by wh7qq
Sat Nov 11, 2017 6:41 pm
Forum: AIY Projects
Topic: No password change recommended?
Replies: 2
Views: 186

Re: No password change recommended?

You are absolutely correct, that changing the default password is the safest approach . I don't use google AIY or any other so it is possible that it may be effected b y the change but there should be a way to fix that in the Google app or support literature.
by wh7qq
Wed Nov 08, 2017 3:33 am
Forum: Troubleshooting
Topic: heart rate monitor help needed
Replies: 3
Views: 175

Re: heart rate monitor help needed

I bought a cheap one from an Amazon vendor, a "ZacUrate 400B" The accuracy of the oximetry may be off a bit but the HR is right on with my manual measurements on my wrist and my temporal artery and very repeatable. I built one years ago using a sensor from a manufactured galvanometric recorder and u...
by wh7qq
Tue Nov 07, 2017 7:16 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Modified rear view display wont turn on anymore
Replies: 1
Views: 195

Re: Modified rear view display wont turn on anymore

Gotta give you credit for raw courage to tackle such a task with the experience/tools you have. I doubt there is any way you can salvage the boards so I would say to start from scratch, buy new boards and confine your future work to modifying the cases to fit or buying cases that will, without modif...
by wh7qq
Fri Nov 03, 2017 9:03 pm
Forum: Troubleshooting
Topic: heart rate monitor help needed
Replies: 3
Views: 175

Re: heart rate monitor help needed

Others are better qualified to comment on the display aspects, but there are several ways to calculate HR: counting beats over time, or calculating from the beat-to-beat interval. The beat to beat calculation can be faster and more responsive but can get confused with an irregular heart beat such as...
by wh7qq
Fri Nov 03, 2017 8:35 pm
Forum: Nederlands
Topic: ssh says at password all the time: "permission denied, please try later"
Replies: 14
Views: 514

Re: ssh says at password all the time: "permission denied, please try later"

Several possibilities come to mind: Check your network connection...does your RPi show up on your router's device list? The default keyboard layout and language setting for the Raspbian OS is for the "UK" (or "GB"). Check that in /etc/default/keyboard, being sure that your settings are appropriate f...
by wh7qq
Fri Nov 03, 2017 8:14 pm
Forum: Troubleshooting
Topic: Installed packages disappear after reboot
Replies: 5
Views: 222

Re: Installed packages disappear after reboot

rpdom's reply is an interesting take on the SD card problem. There are several free -to-download-and -use utilities for checking the SD card: H2testw for windows and mac and f3write/read for Linux systems. They can reveal fake or otherwise defective SD cards. but they overwrite any prior data on the...
by wh7qq
Fri Nov 03, 2017 5:23 am
Forum: Troubleshooting
Topic: Installed packages disappear after reboot
Replies: 5
Views: 222

Re: Installed packages disappear after reboot

Can you tell us exactly what commands you are using to "install" and where are you searching for them once installed? Also, what is your uSD card capacity? Who made it and what class is it? Your installation of jessie is a bit out of date as well. You might try a fresh install of 'stretch" on a diff...
by wh7qq
Tue Oct 31, 2017 6:23 am
Forum: Troubleshooting
Topic: RPi2 SD card holder repair/part number?
Replies: 4
Views: 243

Re: RPi2 SD card holder repair/part number?

There are at least several posts on various tricks to hold card in place (use google or another web search engine...not the search on this forum). The best fix I have found is to obtain a uSD extender card and hot glue it in place. Several are available on Amazon and likely eBay as well. The RPi 2 w...
by wh7qq
Sat Oct 28, 2017 7:12 pm
Forum: General discussion
Topic: Power bank to run the pi 3
Replies: 8
Views: 586

Re: Power bank to run the pi 3

The RPi 3b is much more power thirsty than earlier models. You might get away with this when totally idle but not if the RPi is doing much, particularly graphics intensive browsing or games. On the other hand, earlier models and the current RPi zero could operate on the lower current output but of c...
by wh7qq
Thu Oct 26, 2017 4:08 am
Forum: Beginners
Topic: Troubles with basic installation
Replies: 2
Views: 115

Re: Troubles with basic installation

KLL is exactly on target. Read the ...instructions first. The procedure I follow is to download the image file from the above download site. Check the sha256sum published on the download page. Put your uSD card in the computer using a USB adapter or your computer's native uSD card slot. Use Etcher t...
by wh7qq
Wed Oct 25, 2017 8:25 pm
Forum: Beginners
Topic: any manual or instruction set to get raspbian stretch to be readonly and using X11?
Replies: 1
Views: 133

Re: any manual or instruction set to get raspbian stretch to be readonly and using X11?

There are a number of posts online (use a real search engine, not this one) on setting up a read-only /boot. The /root partition is an ext4 partition that features journaling and is much harder to break than the FAT32 partition /boot. Of course, it is always best to avoid powering off or removing th...
by wh7qq
Mon Oct 23, 2017 2:08 am
Forum: General discussion
Topic: Trouble installing Gimp on raspberry pi 3
Replies: 6
Views: 311

Re: Trouble installing Gimp on raspberry pi 3

I just installed it on my RPi 3B and it went ok. Running Gimp after installation yielded a large number of warnings but it loaded up ok. I did not try to do any thing with it. From the errors you posted, you may have encountered a temporary repo problem...they do happen once in a while...and you sho...
by wh7qq
Fri Oct 20, 2017 7:34 pm
Forum: Raspbian
Topic: Default Date/Time on Raspbian Stretch
Replies: 3
Views: 324

Re: Default Date/Time on Raspbian Stretch

The RPi has no built in code and no built in RTC. My guess: any date/time that it has is probably programmed into the software. In any case, it is meaningless data that gets replaced right away by the current time/date as soon as it is available.
by wh7qq
Fri Oct 13, 2017 7:36 pm
Forum: Python
Topic: GUI python
Replies: 1
Views: 161

Re: GUI python

Just run your python script from the command line...do not load the desktop.
by wh7qq
Mon Oct 09, 2017 8:29 pm
Forum: Troubleshooting
Topic: 2 Raspberry Pi 3 with same Image => one wlan0 found, one no wlan0 found
Replies: 6
Views: 274

Re: 2 Raspberry Pi 3 with same Image => one wlan0 found, one no wlan0 found

I have not had the chance to test all of my Pi's yet, but the problem seems to have magically vanished when I dug up an "old" (4.9.41+ #1023 Tue Aug 8 15:47:12 BST 2017 armv6l GNU/Linux) uSD card and plugged it into one of my zero's. Oddly, images downloaded from earlier Jessie and Wheezy releases d...
by wh7qq
Sun Oct 08, 2017 6:47 pm
Forum: Troubleshooting
Topic: 2 Raspberry Pi 3 with same Image => one wlan0 found, one no wlan0 found
Replies: 6
Views: 274

Re: 2 Raspberry Pi 3 with same Image => one wlan0 found, one no wlan0 found

I am seriously beating my head against this or a closely related issue without resolution to date. I think the RPF has gotten itself into a mess with too many or too frequent upgrade cycles....like every month? The result seems to be software testing, particularly where backward compatibility and co...
by wh7qq
Sun Oct 08, 2017 6:23 pm
Forum: Beginners
Topic: Humidity and temp sensors for long use in industry...???
Replies: 2
Views: 207

Re: Humidity and temp sensors for long use in industry...???

I can't speak to the longevity or ruggedness of the humidity sensors but the DS18B20 temp sensors, particularly the ones that are in a stainless case. are quite dependable and look to be pretty robust. Half an answer anyway :)
by wh7qq
Fri Oct 06, 2017 7:19 pm
Forum: Troubleshooting
Topic: [Solved] Stuck in loop asking for password before desktop. Check your .profile
Replies: 4
Views: 214

Re: Help please - can't log in to desktop as Pi after reboot! Again?

I can't really see why your system should have changed overnight like that. Did you do any updates or other changes? I have seen some weirdness in the login/password process pretty much ever since RPF got security conscious about ssh logins (basically a good thing to do but confusing in the implemen...
by wh7qq
Tue Oct 03, 2017 7:46 pm
Forum: General discussion
Topic: Why no enthusiast Raspberry Pi products?
Replies: 53
Views: 3241

Re: Why no enthusiast Raspberry Pi products?

I have no statistical basis for my observations but it seems like there is a multitude of Pi-hacker products out there. Just looking through the web pages of Adafruit, PiMoroni, PiHut, UUgear, SainSmart, on and on, you see all sorts of products that are either Pi specific or easily adaptable to the ...
by wh7qq
Mon Oct 02, 2017 3:22 am
Forum: Raspbian
Topic: can not login
Replies: 3
Views: 618

Re: can not login

I've never done this so you got my curiosity going...it takes root privileges to log in to the new user: sudo login "new user" . To log out, simply type exit The new user has no groups so these must be added. See https://www.howtogeek.com/50787/add-a-user-to-a-group-or-second-group-on-linux/ for ins...
by wh7qq
Fri Sep 29, 2017 5:11 am
Forum: Other projects
Topic: How to measure temperature of a Rasberry pi?
Replies: 10
Views: 744

Re: How to measure temperature of a Rasberry pi?

Code: Select all

vcgencmd measure_temp
by wh7qq
Fri Sep 29, 2017 2:20 am
Forum: Troubleshooting
Topic: Raspberry Pi Configuration window not opening
Replies: 1
Views: 168

Re: Raspberry Pi Configuration window not opening

I just tried this on my B+ both from the LXDE desktop and the command line and both ways worked. You may have a bad download. Get a fresh download of Raspbian-latest and be sure to check the sha256sum of your download against the published sha256sum on the Download page above. Etcher is probably the...

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