Hacked Gadgets Forum

August 27, 2014

Spray Chalk Machine

at 9:38 pm. Filed under Crazy Hacks, Electronic Hacks

Spray Chalk Machine

 

Wanting to make an impact on the sidewalk quickly? This Spray Chalk Machine is sure to get that done.

“This device is controlled by two Arduino Duemilanove boards, which apparently base the chalk “dot” timing on encoders sensing movement in the two wheels that the cart rides on. ”

 


August 19, 2014

Binary Wrist Watch

at 9:31 pm. Filed under Cool Gadgets, DIY Hacks, Electronic Hacks

 Binary Wrist Watch

 

Check out this great Binary Wrist Watch. It’s a true watch for the geek since most won’t be able to read it!

Via: Dangerous Prototypes

“The time setting mode can be entered by holding the left button for two seconds. After that the display is blanked and the time can be set bit by bit by switching through the bits by pressing the left button. If the bit is to be set, the right button has to be held down for one second. The watch automatically enters normal display mode after the last bit has been set (once you’ve gone through all the bits).”


August 12, 2014

Dummy Load Build

at 10:29 pm. Filed under DIY Hacks, Electronic Hacks

 Dummy Load Build

 

Wigman27 on the EEVblog has built a great looking Dummy Load. The nice and bright 4 line LCD display shows us voltage, current, resistance and power. This gives some great detail at a glance. The large lugs on the front and simple adjustment knob interface make this a great addition to your bench. The thread is interesting, he discusses the circuit design and shows some nice pictures of the bare PCB that was custom made for the project.

 

Dummy Load Build_2


August 7, 2014

Voltmeter Clock Project

at 10:02 pm. Filed under Cool Gadgets, DIY Hacks, Electronic Hacks

Voltmeter Clock Project

 

If you are into cool clocks have a look at this Voltmeter Clock Project. It is based on the version that I built but has been enhanced with a ton of features such as master clock sync.

“I have used three voltmeters and mounted them on a wooden plinth with a clear Perspex cover to give the clock an industrial look.

I have modified Alan’s code to run on PICBasic Pro version 3. I have also added the following.

Switched display On and Off (keeping battery backup as per Alan’s design) but also allows me to turn meters Off in full power mode.

Synchronization to my Master Clock every 30 seconds

Synchronized LED & Re-Synch LED

Synchronization On & Off

Transistor meter drivers

Separate hourly Chime Circuit

Pulsed “tick tock” seconds sound.”

 

Voltmeter Clock Project_2

July 30, 2014

µVolume USB Volume Control Project

at 7:55 am. Filed under Cool Gadgets, DIY Hacks, Electronic Hacks

µVolume USB Volume Control Project

 

This neat µVolume project by Rupert Hirst of RunAwayBrainz allows you to control your tunes with a nice big knob that uses a rotary encoder to get the user input. You can see the previous version in action below.

Via: Electronics Lab

“Features:

              Arduino Compatible (Atmel Atmega32u4)
              Manual volume adjustment using the rotary encoder
              (IR) Infra red  remote control of volume and multimedia controls.
              Apple remote or user defined
              Visual and audible Feedback
               RGB Lighting Customization’s”

 

 

 

µVolume USB Volume Control Project _2


July 28, 2014

Portable Device for Measuring Hydration and Body Fat

at 9:38 am. Filed under Cool Gadgets, DIY Hacks, Educational, Electronic Hacks

 

 

Cornell ECE 5030 students Uma Mohan, Sarvesh Sukhatme and Priyanka Venkatesh have designed a Portable Device for Measuring Hydration and Body Fat. The project passes a small current through the body to measure the amount of hydration in the person. A 940 nm LED is used to detect the amount of fat the person has by shining it through a part of the body, the amount of light that passes through allows them to calculate the body fat of the person.

“We used a LM358 Opamp to make a voltage dependent constant current source. Setting the resistor connected to pin2 as 200 ohms sets the current as the (voltage magnitude/200) A.  The voltage source used was a square wave with magnitude 0.2V and frequency 2Hz.”

 

July 13, 2014

How to Quickly Trace PCB Tracks

at 7:07 pm. Filed under Electronic Hacks

 

If you are trying to troubleshoot a PCB you probably don’t have the schematic and can just guess where PCB traces go, if you try to follow them manually it can be tedious as you follow vias from one side of the board to the other just to loose the trace under a chip. Sure you can probe around to try to find where the trace goes but with any substantial sized board that can take forever. The technique demonstrated above uses a large finger tip size piece of aluminum foil to quickly dab around the board covering a dozen or more points at a press looking for a common pin. When an area has been found you then just need to probe around and see where the connection was. If the board you are working on is mainly through hole you are probably best off probing around on the rear of the board since items such as electrolytic caps won’t be testable from the component side. 

I have never seen this technique used before, I wonder if a wand type probe tip could be made that would work a bit better than the foil finger. I am imagining a tip that looks something like a brush that girls use to apply blush, if the puffy thin strands of the brush were conductive this might be the ideal tool.

Via: Electronics Foru

 

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