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Harri Ohra-aho
Works at Solita Oy
Attended Tampere University of Technology
Lives in Tampere
91 followers|657,931 views
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Harri Ohra-aho

➥ Internet of Things  - 
 
Luddite cats disrupting ESP8266 PWM tests. Thou shalt not suffer the fly emulating network brain to live! 
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Harri Ohra-aho

➥ Internet of Things  - 
 
Finally got around to trying out a standalone ESP8266 setup on the home sensors. The overkill Arduino + unreliable Bluetooth combo needs to make way for the compact ESP. 
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Harri Ohra-aho

Discussion  - 
 
I needed to verify the dimensions and orientation of an underground oil tank and only had access to it through the filling tube. Attached an Arduino and an ultrasonic sensor to a stick and lowered that into the tank. The readings were all over the place, probably due to the ultrasound bouncing on the tank walls.

Fortunately I also have a LIDAR-Lite module, so I replaced the Ping sensor with it and had very solid results.
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+David Johnson There's actually not much more to it. The LIDAR-Lite communicates through I2C with the Arduino and I just used its default Arduino script to display the distance on the serial monitor.
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Harri Ohra-aho

Work in Progress  - 
 
The Numitron tubes reminded me of an old tube radio, so a retro user interface seemed like the right way to go with the more hi-tech features. ESP8266 and MQTT really is a nice combo.
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i have never seen one before and i have spent some time in diy 2 years
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Harri Ohra-aho

Discussion  - 
 
Updated the DIY web-enabled cat feeder with Pebble control. Client No. 2 seems to realize this all too well. 
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Harri Ohra-aho

Work in Progress  - 
 
Peeking into the cat feeder engine room for a bit of maintenance. 
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Let's just hope the cats don't find a way in :D
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Harri Ohra-aho

Discussion  - 
 
Finally got around to trying out a standalone ESP8266 setup on the home sensors. The overkill Arduino + unreliable Bluetooth combo needs to make way for the compact ESP. 
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Harri Ohra-aho

Discussion  - 
 
Retro meets hi-tech in my prototype Numitron clock with the ESP8266 providing MQTT support.
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Harri Ohra-aho

➥ Arduino  - 
 
The Numitron tubes reminded me of an old tube radio, so a retro user interface seemed like the right way to go with the more hi-tech features. ESP8266 and MQTT really is a nice combo.
5
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Harri Ohra-aho

Work in Progress  - 
 
Numitron working... After sorting through a couple of shoddy Chinese knock-off led drivers. 
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Not the most breadboard-friendly things with their long spindly legs. Maybe I'll need to make some sort of a breakout since I'll be stuffing two more of them on the board.
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Harri Ohra-aho

➥ Arduino  - 
 
Peeking into the cat feeder engine room for a bit of maintenance. 
10
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Harri Ohra-aho

Work in Progress  - 
 
Received a box of Soviet hi-tech display devices; Numitron tubes! Should be interesting wiring up these puppies. As soon as I get some LED drivers, though. 
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Kris S
 
+Roger Tee I think Nixie tubes are a lot cooler though 
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Have him in circles
91 people
Genymotion's profile photo
Marko Ikaheimo's profile photo
Ismael Soumahoro's profile photo
Niklas Collin's profile photo
Janne Gylling's profile photo
Robin Hames's profile photo
Päivi Soikkeli's profile photo
Android Zeitgeist's profile photo
Kashif Hashmi's profile photo
Communities
9 communities
Education
  • Tampere University of Technology
    Software Engineering, 1995 - 2003
Basic Information
Gender
Male
Story
Tagline
Spiral out. Keep going.
Introduction
Software odd-job man
Martial artist (Scandinavian Defendo)
Kettlebell and bodyweight training advocate
Lousy drummer
Sci-fi nerd
Work
Occupation
Senior Software Designer
Employment
  • Solita Oy
    Senior Software Designer, 2001 - present
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Currently
Tampere
Previously
Petäjävesi
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