Let's Make Robots!
It flips an double hourglass every 3 minutes
I made this little silly build because I got my hands on a business gift at work. It's a double hourglass where one glass is regular but the other side lacks the … Read more
Make the shoutbox wide, a super productivety killer
Today I did what I'm best at, getting others to work for me. And todays victim were basile. First a little lure: 2013-10-29 09:12:00| |mogul| |@basile you are … Read more
This is the next iteration of my way to a maze solver. Frame and motors is the same at seen in Wood and Glue roller http://letsmakerobots.com/node/29816 As seen in … Read more
Allows me to program my Arduino via bluetooth, USB not needed any more
I finally figured out how to program my Arduino controlled "Start Here Robot" clone without leaving my chair using bluetooth. Unfortunately it still only works when … Read more
Videos: http://www.youtube.com/watch?v=Pbb9GOWaL4g and http://www.youtube.com/watch?v=mPakG8p3MHE Update: Added schematic for the vacuum system Code word were: … Read more
Beeps then the dog's water bowl is empty
For a friend of mine I made this small alarm that goes off then the dog's water bowl is empty. We set the following design goals: cheapbattery poweredmaintenance … Read more
Enables you to upload code to an ATmega chip Arduino style without a FTDI board
When uploading code to a home brew Arduino clone, one of the magic tricks are to the the target chip to reset at the right moment. Usually the challenge is to … Read more
Program standalone ATtiny / ATmega chips through an Arduino
Using a
1 Program standalone ATtiny / ATmega chips through an Arduino   Read more

Wake-On-Radio when Wake-On-Lan is not an option, and something on saving power

As some of you might already know, I have been working on a Wake-On-Radio system. Some of you will find it boring since it's not about robot building, but on the other hand a few of the sub systems could be useful in a robot... You decide!

I am a grumpy old UNIX sysadmin. I have a few Linux machines running as servers, and a bunch more if we count in friend's machines. I hate to loose systems or data when disks fails. Backups! Daily!

Regulated Joule thief, how?

Many of you have seen or read about a Joule thief, and for the rest of you: http://en.wikipedia.org/wiki/Joule_thief. They come in a great varieties, google easily finds them. One thing that I like about the Joule thief is that it is so forgiving about the applied transformer, the circuit simply adapts to that ever you throw after it. No need for calculations or anything.