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by davef
Mon Apr 24, 2017 10:13 pm
Forum: Off topic discussion
Topic: wifi signal in wavemon raspberry pi
Replies: 5
Views: 1708

Re: wifi signal in wavemon raspberry pi

Any RSSI implementation will probably show variations. Try walking between the Raspberry Pi and your WiFi router and watch your readings. I think there are some time issues to consider when doing this, ie how long it takes to update the RSSI reading. Variation might be reduced by taking several read...
by davef
Mon Apr 24, 2017 8:46 am
Forum: Off topic discussion
Topic: wifi signal in wavemon raspberry pi
Replies: 5
Views: 1708

Re: wifi signal in wavemon raspberry pi

https://en.wikipedia.org/wiki/Received_signal_strength_indication There is no standardized relationship of any particular physical parameter to the RSSI reading. The 802.11 standard does not define any relationship between RSSI value and power level in milliwatts or decibels referenced to one milli...
by davef
Mon Apr 24, 2017 8:27 am
Forum: Off topic discussion
Topic: wifi signal in wavemon raspberry pi
Replies: 5
Views: 1708

Re: wifi signal in wavemon raspberry pi

10 to19dBm is more like a transmitter power level. I don't understand how it could measure that unless antenna gains and path loss it known.

Check again that it is setup correctly.
by davef
Tue Apr 11, 2017 8:46 pm
Forum: Beginners
Topic: Crontab help
Replies: 7
Views: 1730

Re: Crontab help

To answer your question:

Code: Select all

sudo find -name mono -print
by davef
Tue Apr 11, 2017 6:57 pm
Forum: Beginners
Topic: Crontab help
Replies: 7
Views: 1730

Re: Crontab help

#!/bin/bash PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin: and add a path to your mono following this format Also you can tweak your environment variables. Do printenv on the command line. I forget how it is edited then do a saveenv I recall the process is: - stop the boot proce...
by davef
Tue Apr 11, 2017 6:43 pm
Forum: Beginners
Topic: Crontab help
Replies: 7
Views: 1730

Re: Crontab help

Thought a bash script was suppose to start with a shebang.
by davef
Tue Apr 11, 2017 10:17 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C - Small percentage of corrupted data
Replies: 10
Views: 2911

Re: I2C - Small percentage of corrupted data

As it appeared quite "layout" sensitive I re-wired the I2C lines to the ADS1015. The SDA and SCL lines are about 25mm long and I now use a dedicated 3V3 (pin 1) and ground (pin 6) wires to the breakout board. I can now poke my fingers around and hook up 'scope probes to the I2C breakout board with n...
by davef
Tue Apr 11, 2017 8:09 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C - Small percentage of corrupted data
Replies: 10
Views: 2911

Re: I2C - Small percentage of corrupted data

One of the main reasons I moved to the Raspberry Pi was flaky I2C on another Linux hardware platform. I have run I2C on the AVR ATmega series without any problems for years. Running the latest Jessie Lite and trying to talk to a ADS1015 breakout board. I modified code by Lewis Loflin lewis@bvu.net t...
by davef
Fri Apr 07, 2017 7:31 pm
Forum: Other
Topic: Operative System for IoT application
Replies: 4
Views: 1309

Re: Operative System for IoT application

From the Wikipedia page:

Reliability and stability needed for critical machine-to-machine communication (M2M), including very short and stable latency times

I would suggest investigating what they mean by "very short and stable latency times"
by davef
Tue Apr 04, 2017 9:50 pm
Forum: HATs and other add-ons
Topic: Amplify onboard wireless adapter
Replies: 7
Views: 1413

Re: Amplify onboard wireless adapter

Or put an external antenna on the unit instead of the chip antenna. Would require some careful soldering work but looks doable to me.
by davef
Mon Mar 13, 2017 7:13 pm
Forum: General discussion
Topic: Real-time graphing
Replies: 10
Views: 13989

Re: Real-time graphing

Search for rrdtool. There are some RaspberryPi tutorials using it.
by davef
Wed Mar 08, 2017 10:35 pm
Forum: Troubleshooting
Topic: problem with extra wifi dongle
Replies: 12
Views: 2135

Re: problem with extra wifi dongle

r8712u is the same driver that I was using for the ASUS N10.

http://www.linuxquestions.org/questions ... 175596869/

was the solution that I was given. It was easier to buy another WiFi dongle :(
by davef
Wed Mar 08, 2017 9:43 pm
Forum: Troubleshooting
Topic: 3g Dongle connected and working but....
Replies: 4
Views: 1098

Re: 3g Dongle connected and working but....

Boot up without the module connected.

Code: Select all

dmesg
Plug module in and do

Code: Select all

dmesg
again and post the last 10 or so lines
by davef
Wed Mar 08, 2017 9:40 pm
Forum: Troubleshooting
Topic: problem with extra wifi dongle
Replies: 12
Views: 2135

Re: problem with extra wifi dongle

Show us what you have in /lib/firmware/ and /lib/firmware/realtek

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