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by KLL
Tue May 01, 2018 12:27 pm
Forum: Beginners
Topic: Electrical Resistance Calculation Help
Replies: 61
Views: 4058

Re: Electrical Resistance Calculation Help

mahjongg wrote:
Tue May 01, 2018 11:45 am
Also spamming isn't allowed here, so I removed your spam link.
clarify spam link pls
by KLL
Tue May 01, 2018 8:06 am
Forum: Beginners
Topic: Headless, Raspberry Pi 3 Model B V1.2 2015
Replies: 22
Views: 3514

Re: Headless, Raspberry Pi 3 Model B V1.2 2015

sorry, do you want to know all about your board and config? try this
by KLL
Tue May 01, 2018 5:02 am
Forum: Beginners
Topic: Headless, Raspberry Pi 3 Model B V1.2 2015
Replies: 22
Views: 3514

Re: Headless, Raspberry Pi 3 Model B V1.2 2015

-a- so how about a ethernet cable to router and check the ifconfig if ok can do a update upgrade first does the ifconfig command show a wlan0 device at all? -b- i remember that there was a situation where a BAD wpa_supplicant.conf file conflicted with try to use the desktop wifi setup? so i needed t...
by KLL
Tue May 01, 2018 12:49 am
Forum: Beginners
Topic: Electrical Resistance Calculation Help
Replies: 61
Views: 4058

Re: Electrical Resistance Calculation Help

Finding the resistance is just implementing ohms law R=V/I where R=Resistance in Ohm, V = voltage in volt, I = current in Ampere. place some voltage over electrodes dipped in water, and measure the current flow, and you can calculate the resistance between the electrodes. unless your measurement st...
by KLL
Mon Apr 30, 2018 6:57 pm
Forum: Beginners
Topic: connections: SSH not working headless.
Replies: 41
Views: 2316

Re: connections: SSH not working headless.

and also check if the [Caps Lock] LED is NOT ON
when you type the password
by KLL
Mon Apr 30, 2018 6:48 pm
Forum: Beginners
Topic: Run (Camera) Script on bootup
Replies: 4
Views: 471

Re: Run (Camera) Script on bootup

possibly need + 2 more " && " and - 2 less " enter " so try @reboot sleep 60 && export LD_LIBRARY_PATH=/home/pi/projects/mjpg-streamer/mjpg-streamer-experimental/ && cd /home/pi/projects/mjpg-streamer/mjpg-streamer-experimental && mjpg_streamer -o "output_http.so -w ./www" -i "input_raspicam.so" but...
by KLL
Mon Apr 30, 2018 9:46 am
Forum: Beginners
Topic: Acclerometer, Processing and Python
Replies: 6
Views: 535

Re: Acclerometer, Processing and Python

with the acclerometer is tilted left it would play video 1 and of it was titled right it would play video 2. I have tested the acclerometer in Python , made the videos, and I an idea of what kind of code I could use the get this feature running possibly you look for this kind of code #!/usr/bin/env...
by KLL
Mon Apr 30, 2018 7:38 am
Forum: Beginners
Topic: Error: No webcams found
Replies: 1
Views: 205

Re: Error: No webcams found

i think for MOTION there are 2 ways, you go the USB CAM way and that not work with the RPI CAM . so pls search for the tutorial about RPI CAM plus MOTION like https://elinux.org/RPi-Cam-Web-Interface or connect a USB CAM ( sometimes called ?web? cam ) to check your current software installation.
by KLL
Mon Apr 30, 2018 7:28 am
Forum: Beginners
Topic: ADS1115 sensor Interfacing with Raspberry Pi
Replies: 3
Views: 919

Re: ADS1115 sensor Interfacing with Raspberry Pi

i have a bad feeling, with I2C based current loop receiver but you link to 4 single ended / 2 differential input with max ±4.096VDC you must go back to step -1- and verify that the 0..4?8?V ADC and your code works ( without the sensor hardware ) and verify that 0 and 3v3 volt is shown correctly if y...
by KLL
Sun Apr 29, 2018 4:10 pm
Forum: Beginners
Topic: Incorrect password for root terminal?
Replies: 8
Views: 1163

Re: Incorrect password for root terminal?

You should be aware that there was no password set for the root user in order to prevent any hacker form guessing the password and acting as root. After you are through playing "root" disable the password. Also you should change the default password for user pi. You might want to review the RPF doc...
by KLL
Sun Apr 29, 2018 2:51 pm
Forum: Beginners
Topic: Incorrect password for root terminal?
Replies: 8
Views: 1163

Re: Incorrect password for root terminal?

usually can in a normal terminal ( or putty ssh) type pi@RPI2:~ $ sudo su root@RPI2:/home/pi# root@RPI2:/home/pi# exit exit pi@RPI2:~ $ Also... is root terminal application, the same as terminal? I ask because I see the same user and hostname when I access terninal as I do when I access root termina...
by KLL
Sun Apr 29, 2018 2:37 pm
Forum: Beginners
Topic: Incorrect password for root terminal?
Replies: 8
Views: 1163

Re: Incorrect password for root terminal?

Hi All So just having a play around with the new Pi3B+, and wanted to see what the application root terminal looked like. Appreciate it's root access, and I am at risk of knackering up the Pi if I did anything silly, but when I launch the app it asks for the root password, which I was given to unde...
by KLL
Sun Apr 29, 2018 2:07 pm
Forum: Beginners
Topic: defaul ssh user dont work?
Replies: 4
Views: 573

Re: defaul ssh user dont work?

I got the problem with Stretch and Stretch Lite. Putty 192.168.0.26 port 22 runs the access but Stretch substitutes SSH with LXTerminal. And then loses pwd. SSH becomes impossible. After some days of trials, I decided to go back to Jessie available here: downloads.raspberry.org rev 2017-07-05 Then ...
by KLL
Sun Apr 29, 2018 6:11 am
Forum: Troubleshooting
Topic: libsdl1.2-dev won't install
Replies: 4
Views: 689

Re: libsdl1.2-dev won't install

just for info: here i see it is installed??
dpkg -l libsdl1.2debian
ii libsdl1.2debian:armhf 1.2.15+dfsg1-4 armhf Simple DirectMedia Layer
by KLL
Sun Apr 29, 2018 4:17 am
Forum: Beginners
Topic: Average measurement reading in python
Replies: 2
Views: 600

Re: Average measurement reading in python

_A_______________________________________________ I have noticed variation between the first few readings well, you could ignore the first 5 readings. _B_______________________________________________ also it might be good to use a easy filter: https://www.raspberrypi.org/forums/viewtopic.php?f=91&t...
by KLL
Sat Apr 28, 2018 4:30 pm
Forum: Beginners
Topic: Raspi powered by car battery
Replies: 8
Views: 660

Re: Raspi powered by car battery

no idea, but i just read here
LM1084
Vin 7V ( max ratings )


even if i not find the correct datasheet,
but with your 13V battery you want burn 8V*3A in that little thing ( ? without cooler? )

you need a dc/dc switching supply
how about a "usb car charger"
by KLL
Sat Apr 28, 2018 10:46 am
Forum: Beginners
Topic: Electrical Resistance Calculation Help
Replies: 61
Views: 4058

Re: Electrical Resistance Calculation Help

If you really want to work in units of conductance, the one you is the "Mho". (And, yes, that is correct. The unit of measure of conductance is Ohm spelled backwards.) how old are you? see here The mho was officially renamed to the siemens, replacing the old meaning of the "siemens unit", at a conf...
by KLL
Sat Apr 28, 2018 4:37 am
Forum: Beginners
Topic: Headless, Raspberry Pi 3 Model B V1.2 2015
Replies: 22
Views: 3514

Re: Headless, Raspberry Pi 3 Model B V1.2 2015

psk="14720234" that must be the password and not the by Separate tool, wpa_passphrase, can be used to generate 256-bit keys from ASCII passphrase generated passcode, that would be psk=14720234 no "" ___________________________________________________ key_mgmt=WPA 2 PSK + AES key_mg tm =NONE from he...
by KLL
Sat Apr 28, 2018 2:22 am
Forum: Troubleshooting
Topic: 3B+ Keybinding
Replies: 1
Views: 190

Re: 3B+ Keybinding

viewtopic.php?f=91&t=211769&p=1306503#p1306503

looks like (C-A-M) is not used, can do with a script ( see the example).
by KLL
Fri Apr 27, 2018 9:00 am
Forum: Beginners
Topic: Jessie: how to create a desktop shortcut to a USB storage drv?
Replies: 17
Views: 1852

Re: Jessie: how to create a desktop shortcut to a USB storage drv?

very good find! i try to follow in terminal it would be like: cd ~/Desktop ln -s /media/pi/USBDRV and yes, that one is not a .desktop file, ( and no link to a .desktop file ), it is a symlink / softlink until now i not find a way to EDIT that link, but there must be a way, because from MC filemanage...
by KLL
Fri Apr 27, 2018 7:43 am
Forum: Beginners
Topic: automating writing sd cards and USB drives with a PI computer only.
Replies: 12
Views: 841

Re: automating writing sd cards and USB drives with a PI computer only.

and as it is a command line tool a next step could be to learn/use this
by KLL
Fri Apr 27, 2018 7:11 am
Forum: Beginners
Topic: automating writing sd cards and USB drives with a PI computer only.
Replies: 12
Views: 841

Re: automating writing sd cards and USB drives with a PI computer only.

hi @kmabry2007 -A- i understand that there is need for RPI internal tools, what not need a external PC. -1-the SD card copier tool was a real HIT -2-but it miss the creation of .img or .img.zip files. -3- the @RonR backup tool might help out here. -4- the new setup from .img .img.zip like you did is...
by KLL
Thu Apr 26, 2018 10:13 pm
Forum: Beginners
Topic: Jessie: how to create a desktop shortcut to a USB storage drv?
Replies: 17
Views: 1852

Re: Jessie: how to create a desktop shortcut to a USB storage drv?

tbh, it's not about just the shortcut (the LINK!) to the mounted drive, it's actually about a certain directory on the mounted drive (called "programs") . it's still about a shortcut, which of course (@KLL) is a link, not a file But is it honestly not possible by Linux to create a shortcut link to ...
by KLL
Thu Apr 26, 2018 3:41 pm
Forum: Beginners
Topic: COMPLETE BEGINNER with using raspberry pi3 , flask , usb rs485 and r414a01 temperature sensor
Replies: 1
Views: 356

Re: COMPLETE BEGINNER with using raspberry pi3 , flask , usb rs485 and r414a01 temperature sensor

I have to develop a web page to monitor humidity and temperature for my school project. ....then make everything appear online through local web server created using python and flask you should learn python flask in detail, it is very powerful, and fun, but possibly your time is short. in the last ...
by KLL
Thu Apr 26, 2018 2:10 pm
Forum: Beginners
Topic: ADS1115 sensor Interfacing with Raspberry Pi
Replies: 3
Views: 919

Re: ADS1115 sensor Interfacing with Raspberry Pi

-1a- how you connect the ADC to the raspberry? -1b- did you get it running, work on range 0..4 V testing with some voltage signal in that range? whats your code -2- the 2 wire 4 ..20mA sensor how you want connect it? what resistor you used? with the official 250ohm it would be (0) 1 .. 5 V signal. w...

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