Hacked Gadgets Forum

May 25, 2015

Meter Clock using a DS1307 RTC and Trinket Microcontroller

at 3:33 pm. Filed under Cool Gadgets

Meter Clock using a DS1307 RTC and Trinket Microcontroller_2

 

This Meter Clock uses a DS1307 RTC and Trinket Microcontroller to show the current time in style. The meters are PWMed into position directly from a few pins of the Trinket. The meters are ammeters that have had their scale replaced by Hour and Minute scales. You can see the scale adjustment calculated below, another alternative would be to do it in code as I did with the Multimeter Clock

“For a 5 volt Trinket and 50 microamp meters, for full scale deflection we need a series resistor on each meter to keep the current less than or equal to the maximum current the meter can handle. Using Ohm’s law, R = V / I = 5 / .00005 = 100,000 ohms (100 K). You will need two of these resistors, preferably 5% or better tolerance. These are commonly available from electronics suppliers. If you want precision in calibrating the meter, you may want to substitute each resistor with a 100K potentiometer with a series resistor, perhaps 10 to 47 K. This allows for tuning the resistance. When I designed the project, the 100K resistors gave accurate enough time without needing potentiometers.”

 

Meter Clock using a <a target=

May 24, 2015

Gesture Control iphone Dock

at 11:11 pm. Filed under Complex Hacks

 Gesture Control iphone Dock

 

Zhiyuan Teo and Mohit Yogesh Modi made this iPhone Gesture Control for their ECE 5760 Final Project. Their system uses a camera to look for certain gestures to control the docked iPhone.  The current version uses a green square as the item that is being tracked and there are 4 video regions that are being watched. With a bit more work a hand could be tracked instead of the marker cap.

“A video camera captures gestures that are then translated into commands to be issued to the iPod/iPhone (which for simplicity we will subsequently refer to generically as ‘iPhone’). For our project, we used the Altera DE2 FPGA board to process the video and communicate with the iPhone. There are three principal components in our design: an iPhone controller module, a VGA controller and a camera input system. The iPhone controller is responsible for the I/O with the iPhone via a TTL serial interface. The VGA controller outputs a video containing a composite of the input camera image, iPhone metadata and gesture tracking information. “

 


May 22, 2015

Bug in Code Requires Boeing 787 Dreamliner to Reboot at least every 248 days to stay Flying

at 11:35 pm. Filed under Insane Equipment

 

The Dreamliner is a great looking plane and is full of the latest technology but like any other piece of sophisticated technology there is a lot of code behind the scenes keeping things working. Bug in Code Requires Boeing Dreamliner to Reboot at least every 248 days to stay Flying! If you have ever taken even an introductory programming class you will have probably seen the effect of integer math overflow. If you increment an integer one more time past the largest value it can hold it will overflow. This results in the new value being smaller than the previous value. This can result in strange scenarios that can cause issues if not checked for. There are many systems that had roll over issues 15 years ago (Y2K) when systems with 2 digit year representations reverted to the year 1900. Even the loved Unix time base is based on the number of seconds that have elapsed since January 1st 1970. This means that every day the Unix time increased by a count of 86400 since January 1st 1970. This also means that the 32 bit signed int will overflow in 2038.

I can understand how this type of bug got slipped into the plane code, I am just not sure how it remained uncaught. I would hope there would be very strict line by line code review where bound checks would have been tested. At least it was caught before it caused an accident and it will now be a reminder how important every bit of code it. At least if there is an issue in the air with the backdoor a skilled hacker might be able to hack into the system and bring things back online. :)

 

Bug in Code Requires Boeing 787 Dreamliner to Reboot at least every 248 days to stay Flying_2


May 21, 2015

Shrink Paper Money

at 11:51 pm. Filed under Complex Hacks

 

We have seen methods of shrinking coins before. In the video above Ben Krasnow shows us how to shrink paper money using liquid anhydrous ammonia. Ben dips the money into the ammonia, lets it dry and repeats the process. Each time this process is repeated the bill shrinks slightly. Sure makes for an interesting looking bill but be prepared to have a conversation piece that you won’t be able to spend.

 

May 20, 2015

Cheap PCB Isolation Milling

at 2:05 pm. Filed under Complex Hacks, Educational

Cheap PCB Isolation Milling

 

If you like making your own printed circuit boards and have a CNC machine wouldn’t it be nice to do some Cheap PCB Isolation Milling? Well how is free, that’s right  has put together an Instructable that goes through the process using only free software.  Below will show you all the things you need.

“Things you need:

  • computer with internet connection
  • cnc mill/router, the more accurate the better
  • 45°/20° V-Bit
  • 0.8mm drill bit
  • 3mm endmill
  • copper clad board
  • double-sided adhesive tape

You need the following software:


May 19, 2015

RC Airboat Rescue

at 11:55 am. Filed under Cool Gadgets

 

TraxxAlu has a nice RC Airboat and Truck.  Watch this cool video where the RC Airboat gets stranded and needs to be rescued. Best of all it is all done remotely using FPV. I can see this working full scale quite well also! 

 

May 17, 2015

Name the Thing Contest – 281

at 2:33 pm. Filed under Contests

 guess_this_281

 

The prize this week is a HMC5883L Triple Axis Compass Magnetometer Sensor so you can add some directionality to your next project. This contest will run for one week (May 17 – May 22, 2015). Ending time is based on central standard time. To enter, identify the item above and what it can be used for.

Please do not give the answer in the comments.

Send an email to contest @ hackedgadgets.com with “Name the Thing Contest” as the subject, and the message body consisting of:

  • The name of the item in the above picture
  • An example of what the item pictured above can be used for

The winner will be chosen at random from all of the correct entries.

Below is a picture of the prize.

 

electronic_compass_2

 

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