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Harri Ohra-aho
Works at Solita Oy
Attended Tampere University of Technology
Lives in Tampere
87 followers|601,144 views
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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.
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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. 
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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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Harri Ohra-aho

Work in Progress  - 
 
Testing the ESP8266 for reliability. Around 6000 successful HTTP requests in 24 hours and going strong. I guess it's safe to embed in a project. 
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+Peter Scargill Fortunately the HTTP client library I'm using ( https://github.com/McOffsky/Arduino_ESP8266_HTTP_Client ) handles these situations beautifully and reconnects automatically so I didn't have to do anything. Tried killing the router and disconnecting its network cable and after a brief period of failed attempts the connection was always restored. 
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Harri Ohra-aho

➥ Arduino  - 
 
Since the Arduino inside the cat feeder had free memory and pins I decided to go for a little Pavlovian experiment and play a jingle before serving. A valuable contribution to science! 
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Do you know already which music your cats like best?
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Have him in circles
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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.
11
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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. 
24
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Let's just hope the cats don't find a way in :D
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Harri Ohra-aho

Work in Progress  - 
 
Retrofitted my cat feeder's brain with the ESP8266 and took out the need for a Bluetooth middleman. A bit of a tight fit with the new power arrangement but squeezed everything in place.

Brain now polls the central Clojure cloud server directly for feeding times. 
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+Ishben Owan There is. Not much to see though, as it's just a box spewing out pellets: https://www.youtube.com/watch?v=4xZQNI6BJuc
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Harri Ohra-aho

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Have him in circles
87 people
Hannu “Niki” Henriksson's profile photo
Ilkka Hartikainen's profile photo
Alan Alvarado's profile photo
Jouni Sonninen's profile photo
Pietari Kettunen's profile photo
Marcin Jabrzyk's profile photo
Eero Mäkelä's profile photo
Suvi Peltomäki's profile photo
Lauri Pekkala's profile photo
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10 communities
Education
  • Tampere University of Technology
    Software Engineering, 1995 - 2003
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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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