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by rpifreeze
Sat May 07, 2016 12:25 am
Forum: Beginners
Topic: Monitor self voltage (ADC)
Replies: 13
Views: 3034

Re: Monitor self voltage (ADC)

I think I solved the problem, but please watch this thread for few weeks still :) First of all, I took a simple PCF8591P module. It's only 8-bit and Vref is pretty high (5.17V). I put a low pass filter to all inputs. First one measured came from power supply (USB and to 5V rail of RPI) and differs (...
by rpifreeze
Fri May 06, 2016 11:17 pm
Forum: Beginners
Topic: Monitor self voltage (ADC)
Replies: 13
Views: 3034

Re: Monitor self voltage (ADC)

Thank you All for suggestions. I will provide my schematic shortly, but for now, let me tell you that I suppose some problem with wiring, because when I connect a separate power source (battery bank, pins directly from battery), and put +/- to IN1 and GND to PCF8591P, and merge grounds (ground of Pi...
by rpifreeze
Wed Apr 27, 2016 10:30 pm
Forum: Beginners
Topic: Monitor self voltage (ADC)
Replies: 13
Views: 3034

Re: Monitor self voltage (ADC)

I guess mz ADS1015 got damaged due to...testing, but I've read a little about ground loops and I think this is the root cause, because when I connect AAA battery to IN0+ IN0- on my MCP3424 module it shows correct voltage. There might be also a problem with voltage divider (~10k and 18k), but I don't...
by rpifreeze
Mon Apr 25, 2016 9:10 am
Forum: Beginners
Topic: Monitor self voltage (ADC)
Replies: 13
Views: 3034

Re: Monitor self voltage (ADC)

I cannot average readings, as ALL of them are inaccurate and too low compared to real voltage (-20..50mV). I suppose this is also not an issue with regulator as ADC chips mentioned previously are powered by a 5V regulator. ADC use soooo less miliamps that regulator power doesn't even change a 0.001 ...
by rpifreeze
Mon Apr 25, 2016 2:08 am
Forum: Beginners
Topic: Monitor self voltage (ADC)
Replies: 13
Views: 3034

Monitor self voltage (ADC)

Hello, My plan is to monitor RPI own 5 and 3.3V voltage lines, but faced small problem. My results are always inaccurate and differ about 20-50mV compared to my multimeters that are not so cheap (~60$). It's not about VREF, because I used Pololu small step-up converters (3.3, 5V). They are really go...
by rpifreeze
Thu Apr 21, 2016 10:49 am
Forum: Automation, sensing and robotics
Topic: PCF8591P and 50-70mV difference
Replies: 3
Views: 743

PCF8591P and 50-70mV difference

Hello all, I'm having a problem with inaccurate reading from PCF8591P. I attached self made Li-ion UPS to RPI and wanted to measure battery voltage, but it always differs. PCF module is connected properly, Vin and Vref set to stablized 5.01 volts that doesn't even change a little. When I connect a s...
by rpifreeze
Sun Apr 17, 2016 7:02 pm
Forum: HATs and other add-ons
Topic: Battery bank - charge and serve at a time
Replies: 80
Views: 101565

Re: Battery bank - charge and serve at a time

@usonic - did you manage to set up such ups ? I wish to avoid ready-made components and do it by myself, so I'm searching for some working and simple schematic, or, designing something by myself. Two ideas came to my mind and one of them almost worked. First one, was to use two schottky diodes, li-i...
by rpifreeze
Thu Mar 24, 2016 10:23 pm
Forum: Troubleshooting
Topic: (UPDATE) Drivers for TL-WN725N V2 - 3.6.11+ -> 4.xx.xx+
Replies: 1399
Views: 1294707

Re: (UPDATE) Drivers for TL-WN725N V2 - 3.6.11+ -> 4.1.xx+

Hi Mr E, can you build for your modules for 4.4.5-v7+ #856. Thanks. Bit of a pain as I'm trying to update the compiled drivers for the commits that appeared while I was away and this is cause me real headache. MrEngman Could we know how you compile these modules, or is it your secret ? I'm asking b...
by rpifreeze
Sat Nov 28, 2015 1:06 am
Forum: HATs and other add-ons
Topic: Battery bank - charge and serve at a time
Replies: 80
Views: 101565

Re: Battery bank - charge and serve at a time

this might be of interest to you i worked this one out as i had the same issue as soon as you pluged charger in the pi restarted because of a brown out in the circuit Thank you for details. I think I came to very interesting idea, very similar to yours. Look, I have USB charger that has one 18650 i...
by rpifreeze
Mon May 18, 2015 11:22 pm
Forum: Troubleshooting
Topic: CRON process name in UPPERCASE
Replies: 1
Views: 1294

CRON process name in UPPERCASE

Hi, I boot my fully updated RPI2 and in "ps" command I see cron PID with cron binary in UPPERCASE. [email protected]:~# pidof cron [email protected]:~# pidof CRON 2256 [email protected]:~# cat /proc/2256/cmdline /USR/SBIN/[email protected]:~# stat /USR/SBIN/CRON stat: cannot stat `/USR/SBIN/CRON': No such file or direc...
by rpifreeze
Thu Apr 02, 2015 7:35 pm
Forum: HATs and other add-ons
Topic: Battery bank - charge and serve at a time
Replies: 80
Views: 101565

Re: Battery bank - charge and serve at a time

Guys, I finally found something ! It's not a battery bank, but module that switches automatically power source from battery (12v lead acid) and AC source. I've connected 230V adapter and feed it with 24V/4.6A. Also connected 12Ah 12V battery and after one hour tries, it seems to solve my all searche...
by rpifreeze
Wed Mar 11, 2015 12:44 am
Forum: HATs and other add-ons
Topic: Battery bank - charge and serve at a time
Replies: 80
Views: 101565

Re: Battery bank - charge and serve at a time

@Bababaguns - there are plenty of these banks on newegg, so what model do you have ? Honestly, I doubt it will charge and sever at the same time, because...it's nowhere written so. The only exception they write "simultaneously" is when it comes to charging phones and when the bank has two USB ports....
by rpifreeze
Sun Mar 08, 2015 3:16 am
Forum: HATs and other add-ons
Topic: Battery bank - charge and serve at a time
Replies: 80
Views: 101565

Re: Battery bank - charge and serve at a time

Some time passed, to refreshing question - has anyone seen/used ready-made battery bank, than can be charged and being charged at the same time ? I'm interested in 7-10 Ah and 5V with (as much as possible) low voltage drop when draining ~1 Amp. I just wished to leave it unattended and not care about...
by rpifreeze
Fri Jan 17, 2014 9:34 pm
Forum: Networking and servers
Topic: NAT and high IRQ load
Replies: 7
Views: 3551

Re: NAT and high IRQ load

I see you have different load - "sy" means system or some core services but in my case, it's about "si" - system interrupt. I'm testing it now and downloaading some free game via torrent (War of warplanes). conntrack has 257 connections established. Download or traffic throught RPI is about 4500 kB/...
by rpifreeze
Wed Dec 04, 2013 10:20 pm
Forum: Networking and servers
Topic: NAT and high IRQ load
Replies: 7
Views: 3551

NAT and high IRQ load

Hello, Colleague asked me to determine what is the weakest part in RPI when it comes to forwarding packets using NAT. Currently, there are two network cards used mcs7830 through active usb3.0 Modecom hub. My question is about performance - what is the forwarding speed You get ? NIC1 - dynamic IP fro...
by rpifreeze
Sun Sep 15, 2013 6:18 pm
Forum: General discussion
Topic: NSA spying and Raspberry Pi
Replies: 56
Views: 15766

Re: NSA spying and Raspberry Pi

@jamesh, unless some agencies forces to use weaker algs or we use some NSA/NIST recommended algorithms/hashes.... http://arstechnica.com/security/2013/09/government-standards-agency-strongly-suggests-dropping-its-own-encryption-standard/ ...and more recent ones on arstechnica https://www.schneier.co...
by rpifreeze
Sun Sep 15, 2013 5:41 pm
Forum: Networking and servers
Topic: security issue - kernel for router
Replies: 7
Views: 1916

Re: security issue - kernel for router

More enigmatic cant be you :) Nevermind, I've got enough of RPI. Too much time wasted, too much "cant be done yet" and too slow as of current needs (slowe than typical phone) I waited a lot of time in hope for some change to better, however, each time, I suffer some issue that costs me much. Unexpla...
by rpifreeze
Sun Sep 15, 2013 1:33 pm
Forum: Networking and servers
Topic: security issue - kernel for router
Replies: 7
Views: 1916

Re: security issue - kernel for router

Quote from first link "How nice. Those links do not answer anything, the last two are old and the first only mentions the issue "as an issue", without any hint on _when_ or _if_ it might get solved. They are shipping unsupported and insecure software and no one seems to bother?" Something smells me ...
by rpifreeze
Fri Sep 13, 2013 4:01 pm
Forum: Networking and servers
Topic: security issue - kernel for router
Replies: 7
Views: 1916

Re: security issue - kernel for router

no response ?
I'm starting to believe that lack of answer is...acceptance for those assumptions.
Come on, get me out of (false?) assumption.
by rpifreeze
Mon Sep 09, 2013 11:01 pm
Forum: Networking and servers
Topic: security issue - kernel for router
Replies: 7
Views: 1916

security issue - kernel for router

Hello all, I'm using RPI as a router (ppp client). There are some issues with my provider of ppp package inside Debian, don't know yet, but my question is: My question - Is someone monitoring kernel security in RPI ? Native Debian stable doesn't have such kernel like 3.6.11+ and as I remember, it re...
by rpifreeze
Sun Aug 18, 2013 11:54 pm
Forum: Troubleshooting
Topic: squid crashing PI
Replies: 4
Views: 1340

Re: squid crashing PI

Possibly solved. Not sure whether this is really a solution, but my machine was possibly damaged somehow. No errors on disk, but I have strange feeling that something is wrong with it... :) For now, I saw that my loopback interface was not up during boot despite proper entried in interfaces configur...
by rpifreeze
Thu Aug 15, 2013 3:02 pm
Forum: Troubleshooting
Topic: squid crashing PI
Replies: 4
Views: 1340

Re: squid crashing PI

Thanls for reply. Squid works as filter only, doesnt save anything to disk. Just a 20 MB of filters (domains/IPs), cache_mem set to 64 MB if that's what you asked for. Free mem stays at 350 MB (rest for kernel, services, buffer), swap disabled, dphys-swap package uninstalled. lsof stays at ca. 3500 ...
by rpifreeze
Thu Aug 15, 2013 2:13 pm
Forum: Troubleshooting
Topic: squid crashing PI
Replies: 4
Views: 1340

squid crashing PI

Hello, Pi is working as a pppoe client (shares internet) and has some services running, like dns server, squid3 with filtering only. It shares also internet via WiFi Asus USB-N53. What's happening recently is that Pi suddenly freezes (heh, look at my 1 year nick ;) and become inaccessible so only re...
by rpifreeze
Fri Jun 28, 2013 12:24 am
Forum: HATs and other add-ons
Topic: Battery bank - charge and serve at a time
Replies: 80
Views: 101565

Re: Battery bank - charge and serve at a time

if this larger one can serve DC while being served DC, then I'm ready to buy it to test it. I think it will work for very short blackouts since batteries also need some time to recharge (haven't rad documentation yet), but it looks very promising. One bad thing is that we have no control over power ...
by rpifreeze
Sun Jun 16, 2013 8:10 pm
Forum: HATs and other add-ons
Topic: Battery bank - charge and serve at a time
Replies: 80
Views: 101565

Re: Battery bank - charge and serve at a time

@mrteach - I also bought something similar (Omega brand?) and I read that it cannot do two things at once. Damn poor toys and description hidden from user as it was clearly stated, but only inside package Anyway, I'm going to create a small ups by myself. Despite having poor knowledge, I'm going to ...

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