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by wolf.z
Thu Aug 23, 2018 2:39 pm
Forum: Automation, sensing and robotics
Topic: wind speed protocol for reed anemometer
Replies: 9
Views: 1111

Re: wind speed protocol for reed anemometer

Thinking of reusability of your design, you should consider windspeed in a NMEA or APRS sentence. With the latter being an amateur's quasi standrard format, the former being an industrial standard. See:
$WIMWV http://www.oceandatarat.org/?page_id=723 end of page
http://aprs.org/doc/APRS101.PDF page 27
by wolf.z
Tue Aug 21, 2018 7:54 pm
Forum: Automation, sensing and robotics
Topic: Calculate distance traveled with a variable time and speed (Odometer)
Replies: 20
Views: 3246

Re: Calculate distance traveled with a variable time and speed

... I am writing this with Python 2.7,... I guess, that I need to check first if the current new lat and long are the same as the last lat and long, in order to know when to calculate the new distance, right? Think twice. You better check, whether lat OR lon changed rather than AND, since moving al...
by wolf.z
Tue Aug 21, 2018 7:43 pm
Forum: Automation, sensing and robotics
Topic: Calculate distance traveled with a variable time and speed (Odometer)
Replies: 20
Views: 3246

Re: Calculate distance traveled with a variable time and speed

... My variables are: - ... - race_time: Race time starts to increase from 0 and it is actually measured by the GPS UTC time and converted to seconds. Currently this is what I am doing right now: ... if race_started == True: # if race is started dist_miles = mps * race_time # calculating distance w...
by wolf.z
Thu Aug 16, 2018 9:32 am
Forum: Off topic discussion
Topic: Nomenclature of the Future
Replies: 9
Views: 3616

Re: Nomenclature of the Future

...It's the Raspberry Pi Foundations baby, they get to name it. Hmmm, WHHeydt just made a suggestion on how to take care for clarification by name in an ever growing Pi family. So what's the problem with that suggestion? I see no contradiction in supposing nomenclature by users an naming things by ...
by wolf.z
Thu Aug 16, 2018 9:27 am
Forum: Other projects
Topic: what to do with an old police scanner.
Replies: 11
Views: 2716

Re: Not sure where else to ask this....

Considering what a radio scanner is intended for you might build an analogue to streaming-for-whatever setup. However, I am neither aware, whether the police radio communication in your country is already digitized nor it is legal to scan this kind of communication. Assuming, you reside in the US: T...
by wolf.z
Tue Aug 14, 2018 10:46 am
Forum: Troubleshooting
Topic: Wired Ethernet upload faster than download
Replies: 29
Views: 2459

Re: Wired Ethernet upload faster than download

... I might have thought that the problem.... But it still perplexes me that when I connect the pi directly to the FIOS router I get 250 Mbit/sec download and upload speeds. I don't see too much of a problem since 250Mbit/s is stunning fast considering a physical USB2 speed of about 480MBit/s. What...
by wolf.z
Wed Aug 08, 2018 6:16 am
Forum: Off topic discussion
Topic: Definition of ironic
Replies: 32
Views: 7374

Re: Definition of ironic

Stop google from claiming common words. This was just the beginning. If they'd succeed, they will claim even more generic words, just like "generic". I dare to assume, google will not kill the raspberry foundation. Screwing up property rights of common property with an educational foundation as a mo...
by wolf.z
Wed Jul 18, 2018 3:33 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: using Uart Pi 3 b+
Replies: 1
Views: 1988

Re: using Uart Pi 3 b+

Probably you have to disable the login shell? Make sure: /boot/cmdline.txt should contain no more „console=ttyAMA0,115200“, whereas your /boot/config.txt should contain an „enable_uart=1“. Check with commands sudo nano /boot/cmdline.txt sudo nano /boot/config.txt Exit editor with ctrl x Or use raspi...
by wolf.z
Tue Jul 10, 2018 4:36 pm
Forum: General discussion
Topic: Thinking of writing a technical FAQ
Replies: 53
Views: 3911

Re: Thinking of writing a technical FAQ

hippy wrote:
Tue Jul 10, 2018 2:22 pm
Not sure if these would all be considered 'tech questions' but are some of the things which seem to come up time after time, in no particular order ...

Which Pi variant should I buy ?
...
How do I run my .exe program ?
Great collection! Applause.
by wolf.z
Thu Jul 05, 2018 11:10 am
Forum: Beginners
Topic: Power on / off button for Pi
Replies: 19
Views: 24136

Re: Power on / off button for Pi

This issue has been discussed many times. The "off" functionality is easily moved to anther GPIO pin. It is controlled by a script as from linked example. The wakeup functionality is controlled by a binary system file. So pin5 appears to carry a hardwired function in means of wakeup (unless someone ...
by wolf.z
Tue Jul 03, 2018 6:02 pm
Forum: Troubleshooting
Topic: Strange Failure: Missing files on several of my devices
Replies: 2
Views: 254

Re: Strange Failure: Missing files on several of my devices

Just a guess: Either your image or image clone process or the SD card hardware is crap. Since your 4 Pis use the very same clone:
how did you clone?
did you format the SD cards prior to cloning? If so with what tool?
by wolf.z
Wed Jun 27, 2018 7:54 pm
Forum: Beginners
Topic: can i cool my raspberry pi 3 b+ with a 9v motor with an external 9v battery
Replies: 14
Views: 1367

Re: can i cool my raspberry pi 3 b+ with a 9v motor with an external 9v battery

OK. Since your fan motor is not connected to the Pi by any means a radio interference is most probable. Solder three capacitors to your motor's power terminals. One in between the terminals, two at each terminal to ground, say, the motor housing, see schematic C1 through C3. album_pic.php.gif If tha...
by wolf.z
Tue Jun 26, 2018 11:23 pm
Forum: Beginners
Topic: can i cool my raspberry pi 3 b+ with a 9v motor with an external 9v battery
Replies: 14
Views: 1367

Re: can i cool my raspberry pi 3 b+ with a 9v motor with an external 9v battery

As pcmanbob said, please give more details.

Is the motor connected to the Pi's USB, any other Pi port, or to a 9V battery?
How do you switch the motor?
To what is the monitor - powerwise - connected?
by wolf.z
Thu Jun 21, 2018 11:56 am
Forum: Networking and servers
Topic: Can't see my AP on other devices
Replies: 15
Views: 3516

Re: Can't see my AP on other devices

I see 3 possible sources of error. 1. Make sure, your WIFI hardware is AP enabled. To do so iw list | grep AP should return something with "AP" in it. Otherwise your hardware does not support AP mode. 2. Are you sure, you need the driver statement in hostapd.conf? This line wasted 40h of my lifetime...
by wolf.z
Mon Jun 11, 2018 6:24 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi communication over radio
Replies: 5
Views: 881

Re: Raspberry Pi communication over radio

The most challenging task may be the rigth place for barometric measurement.With all the aerodynamics around the rocket's body.. If you would succeed, you may use it as a source for deploying the parachute. Consult an aerodynamics knowledgable person for finding the right place for your pressure pro...
by wolf.z
Mon Jun 11, 2018 6:15 pm
Forum: Beginners
Topic: "Webserver controlling gpio: Is this possible?
Replies: 7
Views: 788

Re: Is this possible?

Yes, all seems possible. Read about basic GPIO handling, read about script languages, preferably python, and after that read about creating commands via html. How to set up a web server will be an effort for you but straightforward. After:
You'll discover beauty.
by wolf.z
Mon Jun 11, 2018 6:08 pm
Forum: General discussion
Topic: Suggesstions For An Innovative Science Project
Replies: 16
Views: 1276

Re: Suggesstions For An Innovative Science Project

...wishing to take part in a Science Exhibition which is going to be held in my school two weeks later. 1. fact: two weeks left. I want innovative stuff, something beneficial for the society... So I request you experienced readers to provide me with something really new and worth building, I am not...
by wolf.z
Sun Mar 26, 2017 8:58 pm
Forum: Troubleshooting
Topic: How to rule iptables best?
Replies: 4
Views: 1359

Re: How to rule iptables best?

Oh great, thank you all. Ample stuff to burn some more time. Will try iptables-persistent with gufw - and for reason of sportsmanship the exit-hook method.

Thanks a lot,
Wolfram

(offline this week)
by wolf.z
Sun Mar 26, 2017 8:39 pm
Forum: Troubleshooting
Topic: dnsmaq, ntpd related problem?
Replies: 2
Views: 497

Re: dnsmaq, ntpd related problem?

Thanks, will try, but next week. Offline this week...
by wolf.z
Thu Mar 23, 2017 10:19 am
Forum: Troubleshooting
Topic: How to rule iptables best?
Replies: 4
Views: 1359

How to rule iptables best?

Dear community, I run a WIFI to WIFI bridge with dnsmasq as the server, and engaged some few simple iptables rules. That setup works except for dnsmasq has to be restarted manually after boot, see other post. How to engage iptables rules at boot best? I found three ways to do so: Ruling all in /etc/...
by wolf.z
Thu Mar 23, 2017 10:11 am
Forum: Troubleshooting
Topic: dnsmaq, ntpd related problem?
Replies: 2
Views: 497

dnsmaq, ntpd related problem?

Dear community, as a dummy it took some more time to finally get a WIFI to WIFI routing setup running. I need that to let the Pi get WIFI access in an outdoor location, 300m far from WIFI hotspot with internet access. For sure I need an AP at that location to get acces to that Pi with a Client. Stat...
by wolf.z
Mon Jan 25, 2016 8:35 pm
Forum: General discussion
Topic: /etc/network/interfaces changed,weird 2 LAN IPs instead of 1
Replies: 71
Views: 114506

Re: /etc/network/interfaces changed,weird 2 LAN IPs instead

well, let me first state, I also spent hours of lifetime struggling with configuring static IP adresses. All three methods, either network or dhcpcd or whatever failed, unless using this strange "inform" term. However, the more important thing is, I do not like people steadily stating, a static IP c...
by wolf.z
Mon Jan 25, 2016 3:38 pm
Forum: Beginners
Topic: Wireless Keyboard and Mouse vs individual plug in
Replies: 3
Views: 925

Re: Wireless Keyboard and Mouse vs individual plug in

I use Logitech K400 keyboard (integrated touchpad). Perfectly done, even for no brainers. Just plug in and go.
by wolf.z
Thu Jan 21, 2016 9:37 am
Forum: General discussion
Topic: External disk ?
Replies: 5
Views: 718

Re: External disk ?

In case, the power supply of your pi delivers sufficient current for even feeding a harddrive, try adding

max_usb_current=1

to your Pi's config.txt (/boot/config.txt) This will tell the USB controller to spend more juice to USB slaves (more than 600mA)
by wolf.z
Sun Jan 10, 2016 12:32 am
Forum: General discussion
Topic: 2 node raspberry pi supercomputer
Replies: 71
Views: 16304

Re: 2 node raspberry pi supercomputer

I am wondering, why nobody is speaking of networking Zeros with an enc28j60 SPI2ETH chip, making use of GPIO (SPI) pins as demanded by the thread starter Ben_is_best? He asked for networking a Pi2 and a zero only. As this thread https://www.raspberrypi.org/forums/viewtopic.php?f=91&t=131145&p=874936...

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