Tag Archives: DIY

Temperature/Humidity Logger

Recently, a need arose to take humidity readings of a crawlspace, over an extended period of time. An Arduino clone called the Bare Bones Board (BBB) is used in this project, mainly for its ability to be mounted to a breadboard.

Using a commercial-off-the-shelf sensor and microSD card, the logger takes temperature and humidity readings at a predefined time interval and writes the readings to a text file on the card. An Octave/MATLAB script is shown that plots the results.

All source code can be found on GitHub.

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Arduino Mega 2560 R3, ICSP Programming and Bootloader Reload using AVRDUDE

Using an off-board programming tool, it’s possible to program the Arduino Mega 2560 directly through the ICSP pins.

I have a Sparkfun Pocket AVR Programmer at my desk, but according to their documentation as of 04.12.2015, the ATmega2560 is unsupported. Pololu has an inexpensive USB AVR Programmer that is up to task.

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2005 Jeep TJ 4.0 Liter Belts/Hoses Service

Servicing the belts and hose on the four liter Jeep Wrangler. Not a difficult chore, and can be done well with inexpensive materials and tools. This job will take a couple hours if all goes well, the time consuming part of the job is getting the materials together.

This is an easy job for the home mechanic, and should be done regularly to prevent catastrophic breakdowns. I’ve owned the Jeep for three years, and the top radiator hose had been ‘soggy’ for a few months. With summer coming up, there’s a high chance of long trips, hot weather and four wheeling. Simple preventative maintenance will go a long way.

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Freestanding Pull-Up Bar

I currently live in an old California Victorian, and am unable to use COTS pull-up bars. Thus, a freestanding pull-up bar made out of wood/pipe/carriage bolts.

The pull-up bar that was made here can be duplicated exactly, or modified to one’s needs. A reader can make their set-up bigger/smaller. I’m 6’2″, and this size was comfortable for me. Also make sure to have plenty of room to put it together, as well as a rather permanent place to put it, moving it will take time.

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Indoor Car Stereo

I’ve never previously had a stereo/speaker problem, for the past seven years I’ve had two iterations of Logitech’s Subwoofer/4+ Speaker combination. One set is currently with my Brother at school, the other set is 3500 miles away in Virginia.

I’ve been in California for the last seven months, thumping along with the laptop speakers. Not bad, tinny, can’t get too loud, can’t rock a party, but okay. This project started when my office-mate came in to work with brand new speakers from some store bought system that he didn’t need.

When I lived in D.C. I used to have an old Cobra C.B. radio strapped to a throw-out computer power supply, so getting a stereo together was the natural response to receiving these speakers. Continue reading