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by klricks
Wed Feb 20, 2019 2:05 pm
Forum: Beginners
Topic: Power Outage
Replies: 16
Views: 212

Re: Power Outage

Power to the HDMI monitor must be present before powering the RPi. When power is restored after a power outage that does not happen. They come on at the same time. The RPi is probably booted but into composite mode so nothing is displayed on HDMI monitor until reboot. I've never had any issues turn...
by klricks
Wed Feb 20, 2019 1:48 pm
Forum: Beginners
Topic: Power Outage
Replies: 16
Views: 212

Re: Power Outage

Power to the HDMI monitor must be present before powering the RPi.
When power is restored after a power outage that does not happen. They come on at the same time.
The RPi is probably booted but into composite mode so nothing is displayed on HDMI monitor until reboot.
by klricks
Wed Feb 20, 2019 2:01 am
Forum: Troubleshooting
Topic: Raspberry Pi Zero W gets really hot but does not turn on.
Replies: 3
Views: 57

Re: Raspberry Pi Zero W gets really hot but does not turn on.

Any RPi that rapidly gets hot has been destroyed.
Damage is not always.... in fact seldom visible.
by klricks
Wed Feb 20, 2019 1:38 am
Forum: General discussion
Topic: synaptic package manager gone?
Replies: 5
Views: 244

Re: synaptic package manager gone?

so, its now optional. what was it replaced with? The Synaptic P ackage M anager never was included in any Raspbian release. It must be installed: sudo apt update sudo apt install synaptic The Aptitude PM has always been included: sudo aptitude As mentioned the Add / Remove Software PM is available ...
by klricks
Tue Feb 19, 2019 6:09 pm
Forum: Beginners
Topic: Would like to Boot to command prompt and then switch to desktop
Replies: 2
Views: 49

Re: Would like to Boot to command prompt and then switch to desktop

I installed Raspbian Stretch to a spare desktop computer and it loads great. Is there a way to install Raspbian on to the computer and it be on the Command prompt. Once I am done tinkering at that level I would like to start the desktop. Thanks Buddy Use sudo raspi-config to configure boot to CLI. ...
by klricks
Tue Feb 19, 2019 1:20 am
Forum: Beginners
Topic: asking for a password?
Replies: 1
Views: 64

Re: asking for a password?

The default password for Raspbian is: raspberry
You should change the password.
by klricks
Mon Feb 18, 2019 1:55 pm
Forum: Advanced users
Topic: transfering files from RPi Zero over serial
Replies: 4
Views: 91

Re: transfering files from RPi Zero over serial

I'd like to get some files from a Raspberry Pi Zero W using the serial con... ... What is a way to reverse the direction using screen or any other common utility and copy a file from the Zero to the notebook over the serial connection? Sending files over serial hasn't changed in decades. You can us...
by klricks
Sun Feb 17, 2019 3:18 am
Forum: Beginners
Topic: Running python from rc.local / systemd service - files
Replies: 10
Views: 185

Re: Running python from rc.local / systemd service - files

If your RPi is set to boot to desktop (GUI) then IMO much better to use the autostart method. /etc/xdg/lxsession/LXDE-pi/autostart In either case: - Make sure your script file is made executable. - Make sure your script file has a proper 'shebang' as first line: #! /usr/bin/python - When starting yo...
by klricks
Sat Feb 16, 2019 9:29 pm
Forum: Beginners
Topic: How can I reinstall Raspbien Lite?
Replies: 7
Views: 165

Re: How can I reinstall Raspbien Lite?

Spode wrote:
Sat Feb 16, 2019 9:22 pm
..

So I could just reinstall Raspebian LIte on the card using the Win32DiskImager without having to reformat the card?

That sort of makes things simpler.
Yes but it is even simpler to use Etcher. Unlike W32DI, with Etcher you don't even need to unzip the downloaded image.
by klricks
Sat Feb 16, 2019 3:42 pm
Forum: Networking and servers
Topic: High performance remote connection to a windows 10 machine
Replies: 10
Views: 280

Re: High performance remote connection to a windows 10 machine

...... I have assigned more RAM to the GPU and checked the resource usage of the RPi. .... I am not sure this is going to help you but... I think that is going the wrong way. You need to decrease RAM to the GPU which will increase RAM available to the CPU. As I understand it the GPU is mainly used ...
by klricks
Sat Feb 16, 2019 12:49 am
Forum: Beginners
Topic: Raspberry PI 3 ADC of 1.3 AC signal
Replies: 2
Views: 102

Re: Raspberry PI ADC of 1.3 AC signal

Hello, I'm trying to use the Raspberry Pi zero to detect a 1.3V AC signal, I know that the Pi is not set up to receive analog signals directly, this is why I have purchased the MCP3002 ADC chip. I have been able to detect DC signals, but AC signals are posing an entirely different problem. Also, I ...
by klricks
Fri Feb 15, 2019 1:41 pm
Forum: General discussion
Topic: Stretch lite console autologin doesn't work after apt-get upgrade
Replies: 4
Views: 199

Re: Stretch lite console autologin doesn't work after apt-get upgrade

raspi-config is a script that you can look and see what was done.

Code: Select all

nano /usr/bin/raspi-config
by klricks
Thu Feb 14, 2019 1:41 pm
Forum: General discussion
Topic: Weather station in freezing weather: questions
Replies: 17
Views: 433

Re: Weather station in freezing weather: questions

The company I work for makes sonic anemometers with built in heaters to melt snow and ice. We have many customers from Northern States, Alaska and Canada who use them.
Not a cheap option however.... ~$3K USD.
https://metone.com/wp-content/uploads/p ... sensor.pdf
by klricks
Tue Feb 12, 2019 10:41 pm
Forum: General discussion
Topic: How can I open a webpage in kiosk mode on startup and disable the "chrome didnt shut down correctly" popup?
Replies: 4
Views: 108

Re: How can I open a webpage in kiosk mode on startup and disable the "chrome didnt shut down correctly" popup?

I have added the necessary code to sudo nano /etc/xdg/lxsession/LXDE/autostart but it seems that the script is not running. What am I doing wrong? The code in there is as follows: ... Wrong path..... Use this one: /etc/xdg/lxsession/LXDE-pi/autostart Note that the above address is new after a recen...
by klricks
Tue Feb 12, 2019 3:31 am
Forum: Automation, sensing and robotics
Topic: driving SSR
Replies: 2
Views: 100

Re: driving SSR

I have a 240v outlet that I am automating with a RPI, I am using a SSR to switch the AC current. The RPI supply's the bare minimum voltage to the SSR so I would like to use an optocoupler to switch 12v to drive my ssr. In this configuration would I need a flyback diode in-between the optocoupler an...
by klricks
Tue Feb 12, 2019 1:59 am
Forum: Troubleshooting
Topic: Do we have a way to invert the logic of the GPIO serial port?
Replies: 17
Views: 404

Re: Do we have a way to invert the logic of the GPIO serial port?

rin67630 wrote:
Mon Feb 11, 2019 11:43 pm
......
The GPIO uses negative logic...
No.....
On the RPi the UART data stream:
A logic level 1 (High) is 3V3
A logic level 0 (Low) is 0V
Start bit is Low.
Idle is High.
by klricks
Tue Feb 12, 2019 12:17 am
Forum: Troubleshooting
Topic: Cannot Install Packages
Replies: 1
Views: 56

Re: Cannot Install Packages

What package are you installing? Not all packages will create an entry in the menu. Sometimes you have to search all the menus to find it. Installing something on one OS does not install it on any others. IMO synaptic is a much better package manager: sudo apt update sudo apt install synaptic The st...
by klricks
Mon Feb 11, 2019 10:41 pm
Forum: Troubleshooting
Topic: Do we have a way to invert the logic of the GPIO serial port?
Replies: 17
Views: 404

Re: Do we have a way to invert the logic of the GPIO serial port?

Hi, I am trying to interface a serial device to the GPIO. As I have seen the Serial GPIo works with negative logic: the signal is normally high and the serial bits are lows. My device outputs the signal in positive logic. I would like to avoid having to wire a hardware inverter. Do we have a way to...
by klricks
Mon Feb 11, 2019 10:33 pm
Forum: Beginners
Topic: Deleting unwanted apps
Replies: 19
Views: 7584

Re: Deleting unwanted apps

When I search for 'Arduino' (the name of both the old and the new app) using Synaptic, it finds only the new version. Hence I cannot choose the old one for deletion. I know that the new one lies directly below the old one in the main menu, so I can readily choose that one when I want to play with m...
by klricks
Mon Feb 11, 2019 2:14 pm
Forum: Raspbian
Topic: How to disable a small data window in the upper right corner?
Replies: 2
Views: 130

Re: How to disable a small data window in the upper right corner?

Please, how can I get rid of this little window that appears every time a key is pressed? I do not want anyone to enter or execute a command through it. Thank you in advance. The box appears to be a keyboard shortcut way to select and execute only icons shown on the desktop. For example press t and...
by klricks
Sun Feb 10, 2019 4:03 am
Forum: Troubleshooting
Topic: RPi 3b+ 3v3 pin shows 0v
Replies: 5
Views: 133

Re: RPi 3b+ 3v3 pin shows 0v

1andr1andr wrote:
Fri Feb 08, 2019 1:45 pm
........ ..but suddenly first rpi died and now the second one.
Some people said, that i can wait for couple of days, until fuse recovered. Should i wait, or bercome crying?
Is your RPi in a case to protect it from coming into contact with any conductive or metal objects?
by klricks
Sun Feb 10, 2019 3:56 am
Forum: HATs and other add-ons
Topic: RS232 without using GPiO help please?
Replies: 10
Views: 260

Re: RS232 without using GPiO help please?

...... Firstly will this work safely with the pi using USB at the pi end and 9 way pins for the other device to be communicated with? Secondly if the answer to the first question is yes, would that cable be seen as another TTY port by the pi so that the gpio does not need to be disabled? According ...
by klricks
Sat Feb 09, 2019 6:31 pm
Forum: Troubleshooting
Topic: MicroSD-card has become readonly
Replies: 9
Views: 203

Re: MicroSD-card has become readonly

mob-i-l wrote:
Sat Feb 09, 2019 6:10 pm
OK, that's too bad. I discovered you could get a new one on warranty, but I think it will be hard to find my receipt: https://kb-eu.sandisk.com/app/rmaform
I believe most manufactures will not warranty the card if they find out it was used in a computer device, IP camera or dashcam etc.
by klricks
Sat Feb 09, 2019 5:54 pm
Forum: Troubleshooting
Topic: MicroSD-card has become readonly
Replies: 9
Views: 203

Re: MicroSD-card has become readonly

If the SD card has set itself to readonly then there is no fixing it. Time to get a new SD card.
You can copy what you need or even duplicate the bad card onto a new card.

Note that hotlinks in signature is disabled on this forum.
by klricks
Sat Feb 09, 2019 3:16 pm
Forum: Troubleshooting
Topic: SOLVED (sort of) LED flickers and fades
Replies: 8
Views: 202

Re: LED flickers and fades

Give a link to the LED datasheet or sellers web site. Different LED colours have different voltage requirements so you would likely need different value resistors for each colour. Typically a blue LED can't be used on a 3.3V GPIO because the voltage needed is >3V3. If that is the case then you would...

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