Hong Kong trip postponed.

Aside

I was supposed to travel to Hong Kong on Saturday 11th October to attend HKTDC, but I had to pull out due to a foot injury. Now it looks as though that might have been a provident decision, given the current unrest in the area.  Continue reading

Sep 22

Stay safe from high quality phishing email scams.

Today I received an email on my BT Internet email account which looked bona fide, but it was a phishing scam. Here I describe how to spot the few clues, to make sure you don’t get caught out. Continue reading

Sep 18

Solder paste under the microscope.

In electronics we regularly use solder paste in the assembly of printed circuit boards (PCBs).
This paste comes in a variety of packages, styles, types and so on. Today I look at one small tub of solder paster under the microscope. Quite literally.  Continue reading

SanDisk Extreme PRO® SDHC/SDXC™ UHS-3 Memory Card

Aside

512 GB SD Card anyone? SanDisk have pushed the boundaries with this new ½ Terabyte SDXC Card. It has 90 MB/s write speed too. Big. And Fast.

SanDisk Extreme PRO® SDHC/SDXC™ UHS-3 Memory Card.

Sep 11

mDNS / Bonjour tool for OS X Now Available in App Store.

My new mDNS Tool for Mac OS X is now available in the Mac App Store.
View it on the App Store or search the Mac App Store for “mDNS Tool”.

Screen Shot 2014-09-11 at 09.23.57

The tool allows you to browse and find all the mDNS / Bonjour services and devices on your network. Bonjour is Apple’s name for their implementation of mDNS, which is used to advertise and locate devices and services on the network.

  • List all mDNS / Bonjour devices on your network.
  • Find the address of devices and services.
  • See all the device details, not normally shown in network browsers.
  • Find IPv4 and IPv6 Addresses for devices.
  • Copy details to the clipboard.
  • Simple to use.
  • No drivers or libraries required.

 

 

Sep 05

Moto 360 Smartwatch on sale today.

Motorolla’s new “moto 360” goes on sale today at 11:00am Central Time (USA)
More details are available here.

Screen Shot 2014-09-05 at 11.37.02

See the launch video here.

The difference between the UK, England and Great Britain explained.

Aside

Ever wondered what is the difference between the terms “Great Britain”, “the United Kingdom” and even “England”? Well here’s the answer…

 

Aug 27

Windows ™ versus Linux on intel Galileo

Here is a really quick and dirty, non scientific comparison of a Galileo GEN1 board running Windows ™ against the same board running linux.
SPI Flash version is 1.0.2.

Login to windows is via telnet.
Login to linux is via ssh.

 Time taken from power-on to login:

Linux  48 Seconds
Windows 68 Seconds

Time taken to power off:

Linux    3.25 Seconds 
Windows  12.54 Seconds

Next I wrote a simple ‘blink’ executable thats sets up Pin 13 for GPIO and then turns it on/off in a tight loop. Source code for both is below. Both are built in ‘release’ mode.

To write the app for Windows on Galileo you need an external PC running Windows 7 or later, and Visual Studio 2013 or later, with the Microsoft IoT dev kit extensions installed.

To write the app for Linux, you need any PC or Terminal capable of attaching via telnet or RS232.

Size of simple ‘blink’ executable

Linux  10080 Bytes
Windows 19456 Bytes

Speed of executing GPIO Writes
The simple app after setting up the GPIO runs in a tight loop just switching the GPIO Pin to 1 and 0 continuously.

The Linux loop:

while(1)
{
    write(fd,"1",1);
    write(fd,"0",1);
}

The windows loop:

while(1){
    digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
    digitalWrite(led, HIGH);  // turn the LED on by making the voltage HIGH
}

These gave the following results:

The Linux version gave a steady 223.9 Hz square wave with a 50% duty cycle. Pulse width is about 2.24 ms.

Screen Shot 2014-08-27 at 15.00.42

The Windows version gave a jittery 42.72 Hz wave with a 35% Duty cycle. Pulse width is about 14.97 ms, but there were occasional gaps in the wave form where it paused for 10 ms or so.

Screen Shot 2014-08-27 at 14.36.39

And finally, the full source code for each of the test apps.

Linux source code:

#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>

void setGPIOPin(char* pin, char* dir, char* drive, char* val)
{
  char buf[256];
  int fd;

  // Open the GPIO Export file
  fd = open("/sys/class/gpio/export",O_WRONLY);
  if(fd == -1)
    exit(-1);

// Export chosen pin
 write(fd, pin, strlen(pin)); // Export GPIO pin
  close(fd);

  // Open exported pin DIRECTION file
  sprintf(buf,"/sys/class/gpio/gpio%s/direction",pin);
  fd = open(buf,O_WRONLY); // open GPIOxx direction file

  if(fd==-1)
  exit(-1);

  // write out the direction
  write(fd,dir,strlen(dir)); // set GPIOxx direction to out
  close(fd);

  // open the drive file
  sprintf(buf,"/sys/class/gpio/gpio%s/drive",pin);
  fd = open(buf,O_WRONLY); // open GPIO drive strength file
  if(fd==-1)
    exit(-1);

 write(fd,drive,strlen(drive)); // set GPIO drive
  close(fd);

  sprintf(buf,"/sys/class/gpio/gpio%s/value",pin);
  fd = open(buf,O_WRONLY);
  if(fd==-1)
  exit(-1);

  write(fd,val,strlen(val)); // set GPIO value
  close(fd);
}

void setMux(void)
{
  // Switch all the SPI1 pins through to the header pins. And enable level shifter.
  setGPIOPin("55","out","pullup","1"); // mux
  setGPIOPin("39","out","pullup","1"); // Pin 13
  setGPIOPin("4","out","pullup","1"); // Level shifter
}

int main(int argc, char *argv[])
{
  int fd;
  setMux();

  fd = open("/sys/class/gpio/gpio39/value",O_WRONLY);
  if(fd==-1)
  {
    printf("Failed to open GPIO On pin 13\n");
    exit(-1);
  }

  while(1)
  {
    write(fd,"1",1);
    write(fd,"0",1);
  }

  return 0;
}

Windows Source code:

#include "stdafx.h"
#include "arduino.h"

int _tmain(int argc, _TCHAR* argv[])
{
    return RunArduinoSketch();
}

int led = 13;  // This is the pin the LED is attached to.
void setup()
{
    pinMode(led, OUTPUT);      // Configure the pin for OUTPUT so you can turn on the LED.
}

// the loop routine runs over and over again forever:
void loop()
{
    digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
    digitalWrite(led, HIGH);  // turn the LED on by making the voltage HIGH
}

Aug 27

How To spot a fake or phishing email.

Here is our cut-out-and-keep guide on how to spot a fake or “phising” email.

A ‘phishing’ email is one that purports to be from someone you do business with, like your bank, Apple, a high-street store or online store, but is in fact a fake email trying to get you to hand over your identity, passwords and/or debit & credit card details.

As an example, take a look at this email which is doing the rounds at the moment: (this is a picture of the email, not the email itself, so it’s safe!).

Screen Shot 2014-08-27 at 16.02.36If you had received this email, would you have clicked on the “Update Now” link?

It looks genuine enough, and if you click on the “Update Now” link in the email it would have taken you to this website: (again, this is a picture of the web site, not the site itself).

Screen Shot 2014-08-27 at 16.16.52

It all looks genuine enough, but if you were to fill in this form, your Apple ID would be taken over, and you bank account cleaned out within minutes. I won’t publish the link that was embedded in that email, that would just be silly, but it took you to an address very similar to this “www.udumy.ru/themes/Similitude07_div/forum/appel/” – which should raise alarm bells, because it looks nothing like the usual web addresses for Apple – and they even spell ‘Apple’ wrong in the link.

So how can you tell if an email is genuine? Well, lets take a look at the clues in the original email.

Here is our cut-out-and-keep guide to spotting the fakes:

howto

The simple rule is this:
Never trust any email that asks you to verify your identity or payment details. If you think it might actually be genuine, because you are (for example) expecting an account to expire, then instead of following the links in the email, use your normal routes for contacting the company. Don’t use any email addresses or phone numbers on the email, they might be fake too!