Posted on 2016/03/12


I have had parts for this for a long time, but finally it is assembled and flying…

3D printer

Posted on 2016/03/02


3D printing stuff.. :-)

Water boiler temperature measurement system

Posted on 2015/12/19

Here is my simple IOT-device to measure temperature of hot water boiler and smoke gas of wood-burning stove. It has STM32F103 micro controller running software. Hot water boiler measurements are made by two DS1820 sensors. Smoke gasses are measured by MAX6674 and K-type thermocouple. ENC28J60 module connects this to Ethernet and temperatures are served by really simple HTTP server. I have Linux server reading values once a minute and store them on MySQL database for later use. There is simple web page to view current values and history of one day. This is useful for seeing status of system without actually going to boiler room. Heating of my house is all done by burning wood on that stove so on cold winter that means starting fire once a day and adding wood when that fire starts to go out. Now while coding (working) I can just check my web UI to know, did my starting of fire succeeded and when to add more wood. There are plans of adding some alerts, but that is for later time.


Stuff in picture: Green board on center is my general purpose STM32F103 board(just some voltage regulators, capacitors and USB-connector, that is not used in this project). Under that is programmer board. It is for flashing MCU and is removed when development cycle is over. Under that is main board that basically connects all things together. Bottom blue board is Ethernet module, connected to main board. Metal tube on right is K-type sensor and under that is LCD display for displaying values in boiler room.

Chimney cowl for summer cottage

Posted on 2015/07/21


I have been doing some welding lately. Here is one project.


Posted on 2015/06/19


Bye bye Google code, welcome Github.

Posted on 2015/03/15

Google announced that Google code service is ending so moved my project to Github:




AngularJS course

Posted on 2014/10/24

Just visited AngularJS course on Sovelto. http://www.sovelto.fi/Kurssit/Kurssivalikoima/Pages/Kurssihaku.aspx?kurssiID=4453

Web development experiments

Posted on 2014/10/17

So, I wanted to experiment with Mono, Entity Framework, JSON, HTML5, TypeScript and AngularJS. It is still bit open what my site will actually do once finished, but my idea here is create template that allows rapid development of ‘forms’ based applications. I also plan on doing some offline app with PhoneGap. Stay tuned for more. :-)

You can find project at Github code: https://github.com/OH1TR/mobile-invoicing



Posted on 2014/08/24


New storage silo

Posted on 2014/08/08

I have been really busy on constructing new silo this summer. I uploaded some photos under projects menu. Take a look.

FPGA development board

Posted on 2014/03/05

I been building FPGA development board for SDR experiments. And decided to publish it on Hackaday.io. So there it is, please check it out: http://hackaday.io/project/291-FPGA-development-board.

Site ported to WordPress

Posted on 2013/05/21

So, this site moved again. This time one relative of mine set up couple of web servers and I did some configuration on them. I don’t know was that payment or good will, but he let me put this site to those servers. So I am free riding now. :-) I tried to pull Typo3 to new servers but it got complicated when I should have upgraded and moved site at the same time. Also I had some trouble with typo3 previously so, decided to do some extra work and convert all to WordPress. So here we are. If you can read this conversion was success.

I have plans to upgrade layout to something better, but lets see about that one. Year go by so quickly…

New call OH1TR

Posted on 2011/08/24

I bought new call OH1TR. Maybe dropping that OH1FNJ at some point..

Radio tower

Posted on 2009/12/26

I bought small radio tower at fall. I have been busy with other things, but now I finally got time to pull it up.

RC helicopter

Posted on 2009/06/26

I finally give up to temptation and bought one of these: http://www.esky-heli.com/esky-beltcp-v2-green-6ch-rtf-kit-p-4340.html. I did know it is hard to fly, but it really did come to little surprise how hard it really is. Tried it twice, broke it twice.. :-) Well practice goes on…