Tag Archives: pi

Raspberry Pi 3 A+ VS 3 B+ | compare the raspberry pi 3 a + to the 3 B +

The new Raspberry Pi 3 A+ was just released, basically its a cut down version of the 3 B+.

Here is a comparison between the two.

 

  RPi3A+ RPi3B+ Difference
CPU BCM2837B0 1.4GHz BCM2837B0 1.4GHz Same
Memory 512MB 1GB -512MB
Network Wifi, Bluetooth Ethernet, Wifi, Bluetooth -Ethernet
Size 65mm x 56mm 85mm X 56mm -20mm Shorter
USB Ports 4 1 -3

 

Failed to unzip Raspberry Pi Zero image on OSX | failed to unzip raspberry pi zero zip on osx

I downloaded the latest image for my Raspberry Pi Zero and it started causing problems when trying to unzip it, its happened to me before but I thought Id make a post about it to avoid other search the net for hours before finding a solution.

I downloaded the following image.

When I tried to unzip it, it was renamed to this

Then I tried to double click on that and it was renamed to this.

So I realized I was going nowhere. The fix for this problem is listed below, fire up the terminal and execute the following command.

 

 

Done, enjoy.

The best Raspberry Pi Case Ever! | single unit raspberry pi case includes power

I have looked at a number of Raspberry Pi cases, they all have one thing in common. They have a box (the raspberry pi itself), a USB cable, and an adapter at a minimum.

I wanted to create a unit which will improve these shortcomings for three main reasons.

  1. To look cleaner, neater,  and safety.
  2. Can be installed on sites where you are completing a security audit, the unit will not come under suspicion because of it looks.
  3. Cooling, performance and the ability to expand hardware inside the unit itself.

I used FreeCAD to design the 3D printable design and a Dremel 3D20 printer to print it.

I have made around three designs which I improved on each time, landing on the one published here.

The print contains a space for a Samsung USB power plug and a section for the USB connector, it contains a grove to allow it to sit firmly in place.

The Raspberry Pi sits on four poles which hold it firmly in place, and also allows you to connect the cat5 connected and four USB ports at the bottom.

I have build three slits on the bottom of the cover and three at the top, this is a clever wait to passively cool the Raspberry Pi. The air inside will heat up and rise, then exit from this top slits. This will then create a suction from the bottom, taking in the cool air. No need for a fan! Test proved to be promising.

I am really pleased with the design and use it at home.

I have plans to make it alot smaller, as you can see from the photos the biggest problems are the size of the adapter and the plug into the Pi itself. I have ordered smaller and cheaper power plugs and some L shaped USB connectors. This will allow me to design the casing to be alot smaller, ill keep you posted.

To make this project happen you need the following

Enjoy!

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.

img_20160927_180639

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

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.

Flashing an SD card for a Raspberry PI on OSX

This how to shows how to flash an OS image onto an SD card to use on a Raspberry PI, using a Mac (OSX)

First shows you the mount point

Second unmounts the storage

Third disk dumps it onto the SD card