Raspberry Pi – Experiment 2 | raspberry pi wifi batteries AA experiment duration

Raspberry Pi Power Experiment 2raspberry_pi_logo-svg

Raspberry Pi

Going on from my first experiment, this one will be slightly different.

I will be using a 12v to 5v USB converter and a 12v AA battery caddy. This caddy stores 8 x AA 1.5v rechargeable batteries. This design will closely simulate my end design which will include a charge controller and a 60w Solar panel.

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I did not commit to this design by soldering the wiring and connecting permanently as its a quick dry run test. I simply want to test the duration in which it will power a raspberry pi with a wifi dongle.

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Unfortunetly the results sucked! Taking into account that the batteries are not new, the raspberry pi ran for 4 hours and 37 minutes.

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This is a poor a result and is sending me back to the drawing board in regards to my design. I need to think about getting a sealed lead acid battery with some decent capacity.

Tracking

Experiment 1

Oneplus 3 Dash Charge Review | oneplus 3 three dash charge review example fast charging

I recently posted a Oneplus 3 review, which I forgot to mention one of the most important features of the Oneplus 3… Dash Charge.

Dash charge is the feature which enables fast charging of your mobile phone.

Im quite a heavy mobile phone user so this feature is very important to me, and my feedback so far is very possitive.

Basically charging for 34 minutes gave me 64% charge, see screenshots below.

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How to take offline copy of websites with wget | wget extensions scraping way back machine linux curl

wget

When your going away on leave and need to get copies of you favourite websites use wget! Its available on all linux distros.

You can also build a web archive line way back machine which saves websites at a moment of time.

You need to be a little sneaky with the command you use as most larger websites these days will detect you trying to copy them and try to stop you. You will need to include extensions with your command to fool the site you are a real user.

Here is a command that works for me.

 

Howto resize full disk partitions with LVM | lvm vgs pvs lvs redhat resize2fs centos filesystem

One of the most common tasks that I have been performing lately is disk resize, especially in environment which have not been planned well and taking the application into account.

This was the procedure I performed the other day when an incident was raised.

 

Find the problem.

 

Find out if LVM and the volume group has available space.

Confirm the logical volume name.

Issue the command to extend.

Issue the command to resize the file system.

Confirmation it has taken affect.

 

Raspberry Pi – Experiment 1 | raspberry pi b powerbank wifi usb dongle power test how long it will last

raspberry_piIm currently working on a personal project to have a raspberry pi operating remotely without mains power on a 24/7 basis.

This has raised a lot of questions about whats required to achieve this task, mainly around solar panels and batteries.

wp-1473652945655.jpgI have found a couple articles around raspberry pi power consumption vs raspberry model. I found working with the theoretical max’s always leads to disappointment.

So this is the first of a series of experiments which will step by step lead us to the figures we need to achieve our objective.

In this first experiment we are connecting a Raspberry Pi B with a USB Wifi dongle purchased on eBay. We are finally using a USB power bank (30,000mha).wp-1473652836299.jpg

I have connected these devices together and written a script on my desktop which will poll the raspberry pi on the network and log the results. I will attached the command used to achieve this, just in case you want to conduct come tests yourself.

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After charging the power bank fully, running the raspberry pi lasted for 11hours and 51minutes. So  short of the required 24 hours. Ill be testing different power banks to get an understanding about quality.

Oneplus 3 | Oneplus 3 Mobile Phone flagship killer

oneplus-3

Product Review.

Oneplus 3

From the company with the simplest naming convention, Oneplus. The model is Three and released in 2016, as usual it was released as a flagship killer!

Admittedly I bought the Oneplus 3 because I dropped and broke my Oneplus 2. Actually at this point I’m pleased with the outcome as the Oneplus 3 has turned out to be a great phone.

I don’t want to write a ten thousand word post on the phone, ill mention key points.

First point is the comment about the “Flagship Killer”, its not. I have read many reviews comparing it to the new Samsung s7 , its like comparing a Ferrari with a BMW. Both are sports cars but completely different.

Screen, awesome display. Rich and colorful.

Speed, to date its been like a sports car. Nothing slows it down. All the applications run well, no crashes.

Looks and feels nice, too nice. The new back is very slippery, until I bought a new case for it I feared for its life judging from my track record.

Connectivity it awesome too, I have not had any calls drop out or bad reception. The 4G coverage is good too.

Battery life, not good. But better than the One and Two phones. I’m a pretty heavy user, and usually phones don’t last the day for me…. But the Oneplus Three does.

Camera, really pleased. I actually went to the Tulip Festival over the weekend. Have a look at the phones I took.

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Suunto Traverse Alpha Stealth | Suunto Traverse Alpha Stealth

Product review.SS022469000_Suunto_Traverse_Alpha_Stealth_Front_View_Route_with_POI_POSITIVE

Suunto Traverse Alpha Stealth

www.suunto.com.au

I bought a Suunto several months ago, I have been using it every day since. Very impressed. This specific model is designed for Hunting (shooting), Fishing and sports activities. I didnt even know this brand existed until I saw an ad for them on the internet, I did some research and decided to give it a go. During my research I noticed its not very easily available in Australia, so it was a ebay purchase from England for around $620.00 AUD

First Impressions

When the watch first arrived it was in a rather small box, after opening you will find the watch, and USB charger but no adapter. You will need to use a phone charger or PC to charge it. The watch itself was a little big, but doesn’t feel like it when your wearing it. The built quality and construction looks very good, very high quality.  You feel like an SAS trooper!

Interface

The interface is easy to use, an effort to customize. I spend several hours working out the functions and changing the look and feel of the watch. You can use some assistance from the Android app or the Web interface which makes it easier. After a while you simply get it, using it is not an effort at all.

GPS

Arguably the best feature this watch has to offer. Simply love it. I went hiking in the snow when I first got it, found myself in the middle of a snow capped forrest with nothing but the Suunto to guide me. Thinking about it now it now it sounds like a pretty stupid idea but it guided me through a 5 km hike and brought me back home safely. Having this feature gives you a piece of mind that no matter where you are, you’ll always find your way home.

Some of the functions are POI (Points of interest) this allows you to enter locations into memory like your home, afterwards you can select your home as your destination. This will guide you there using your homes direction, there is no navigation via street maps. It tracks your location and maps it when you finish, you can also set laps for your standard running locations and lets you time it.

Compass

Not much to report here, it works! It will be a very useful tool if you loose GPS reception, more of a backup to the GPS. I have tested the compass several times against a conventional  compass and its always been accurate.

Applications

I am a Mac user, so there is an application for that here.  There’s an app for the iPhone here and the Android here. The application in all cases is called Movescount, its pretty good in logging your GPS info, settings, and overall activity.

Battery and charging

Ideally you don’t want to be charging your phone and watch on a daily basis, you want your watch battery to last years. Although its not the case with the Suunto i was surprised that its not actually such an effort. I have it connected to my phone all the time, so all my calls come through the watch as alerts and sms’s, emails, application notifications etc. Taking this into account, I will use around 10% per day of battery power. I usually charge it once a week and it charges very quickly (1-2 hours) on my PC. BUT, GPS kills it, it will use around 10% an hour depending on the settings you choose for your tracking, you don’t use that function all the time so it wont kill you. That said, in the months i have had the watch it has never gone flat.

Connection with mobile phone

Connection with your phone is possible through bluetooth pairing. I have connected my phone to the Suunto, and its awesome. All the alerts come through, although its NOT a Apple watch its functionally really good. You cannot trigger any phone functions, cannot make calls. I work in an office environment and cannot have my phone ringing and beeping all day long, so its on silence all day. The Suunto vibrates and makes a small beep when an alert comes through, which is perfect for me.

Frustrations / Improvements 

Like anything in life, its not perfect! A few things that could get some more R and D.

  • The buttons, I keep on hitting them while moving my wrist. Its a pain because when I look for the time, i always been in a different menu and need to change back to time.
  • Steps. Although the steps are recorded and displayed very well on the screen with averages and bar graphs I would like to see more information. Something similar to the Fitbit like calories burnt and allows you to compete with other friends in regards to step count. Also the apps don’t really record/display your daily steps.
  • The ability to customize the display and watch, like for example if I wanted an analog or digital display for the time.
  • A good to have would be a heart beat monitor, at this stage its an additional extra which you wear around your chest and pair it.

Conclusion

Im pleased and addicted! As mentioned the watch could use with some improvements, but overall I’m really pleased. Highly recommended.

Puppet filling up /var

Puppet has a directory called reports under /var which will fill disk space constantly, quick way to free up space.

To quickly archive what you have in the reports directory.

Then nuke everything except the last day of reports

Check again afterwards

 

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