28th Jan 2012

How to: A TriggerTrap GH1 Cable…

The above schematic illustrates how to wire the Panasonic GH1 to the TriggerTrap universal camera trigger.  The TriggerTrap uses an opto couple wired common cathode to isolate and protect the...

28th Jan 2012

Supply Droop: Internal Resistance is Futile…

What causes a battery supply voltage to drop when the load increases? Internal resistance does, and while it’s normally around 0.2 ohms per alkaline cell, here is a bit of...

28th Jan 2012

ADC Battery Voltage: Divide, Match and Measure…

While the stock Arduino isn’t particularly well geared to running from a battery source, there are times it will be useful to know the status of our battery voltage. Using...

26th Jan 2012

RGB LEDs: Onstar Characterization…

Though incorrectly marked as common cathode, these common anode high power tri-color LEDs are standard fare across most discount parts websites, eBay included. They are sold with a 3W designation,...

19th Jan 2012

LAVA Rainbow LED kit

¬†Assembly Instructions for LAVA LED Soldering Kit…

18th Jan 2012

Magnetic Copper: Resistance is High…

Just kidding, we all know copper isn’t magnetic, mild steel on the other hand is most certainly magnetic and has the fun property of a much higher resistance than copper....

31st Dec 2011

DC Servo: In a State of Motion…

Software and hardware development have converged into a practical test platform. The encoder processing loop has been converted to fast inline assembly and released under GPL.  And in the following...

15th Dec 2011

Catching some ZZZs, Part 1: Interrupted Sleep

So you finished your lastest Arduino project, hooked up a 9volt battery to the VIN and stuck the whole thing into a project box. You come back a few hours...