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Maximum Sampling in Software 30 Mar 2013 | 09:10 am
When sampling at the maximum software rate, the signal itself may affect the software, resulting in inaccurate readings. Here is an example of how I debugged an issue and doubled the rate.
Copper Connection PCB Layout Editor 1 Feb 2013 | 12:26 pm
Easy-to-use free PCB software from Robot Room. Hobbyist and student friendly, but with powerful features. All of the standard drawing tools, plus continuity tester, board flip, dynamic fills, notes, a...
Yummy Candy Tin Robot 25 May 2012 | 02:11 pm
Yummy is a line-following robot made from an m&m's candy tin, in homage of Sweet. Yummy features a light sensor for detecting when the candy tin has been closed, to delay starting the motors as long a...
Cleaning a Mouse Scroll Wheel 29 Jan 2012 | 05:09 pm
The scroll wheel on the Microsoft Wireless Mouse 5000 can stop working over time. As you'll see, the scroll wheel is a classic interrupter encoder wheel that can be fixed by cleaning. The difficult pa...
Removing Solder from PCB Holes 29 Jan 2012 | 11:04 am
Excess solder can clog circuit board holes due to overzealous soldering or when desoldering to remove a part. It can be annoying to try to get the solder out of the hole, but these methods and tools c...
Sturdy Attachment of a Lego Wheel to a Gearmotor 13 Jan 2012 | 06:06 pm
Nothing is more pathetic than a robot that has lost a wheel. Couplings based on the standard mating cross axle have a habit of sliding off. But, the peg holes present in larger wheels provide opportun...
Replacement Battery Pack from AAA Cells 11 Jan 2012 | 04:54 pm
When a consumer appliance stops working because of a built-in battery or proprietary battery pack, you may be able to repair it by replacing the batteries with off-the-shelf rechargeables. If necessar...
Afterthought Cake Robot 3 Jan 2012 | 07:02 pm
A pleasant robot that doesn't do much consists of a collection of interesting parts assembled together because they didn't fit any other robots. The robot is a successful experiment in making couplers...
Replacement for PNA4602M 26 Dec 2011 | 08:18 pm
The Panasonic PNA4602M 38-kHz infrared detector was a very popular electronic part for obstacle and wall detection. Unfortunately, the PNA4602M is discontinued and similar modules can't handle continu...
Serial Communication 18 Dec 2011 | 06:44 am
A very popular method of sending and receiving data between devices and computers is good old asynchronous serial communication. See traces of characters being transmitted. Learn how far timing can be...
