Archive for the ‘Uncategorized’ Category

“H-Series” Security camera

This post is mostly a note for myself, but might prove useful for other also. A while back I bought a security camera to my home from Dealextreme. It was typical Chinese quality with strange translations and weird software but worked nevertheless. I decided to buy another for my company and chose this model again from Dealextreme and thought that it’s the same camera with updated resolution. I was very wrong, this time the cameras internal software was so buggy that it almost made it unusable. The camera has no brand or name or anything, but the manufacturer is probably Wansview.

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16/06/2014 2 comments
PebbleMondo beta

PebbleMondo beta

I recently switched from Sports Tracker to Runkeeper, because the latter one offers integration with the Pebble smart watch. However both of those refused to work with my Polar heart rate sensor so I ended up with Endomondo. I wanted to keep the Pebble integration, but apparently even though that there are few threads in the interwebs requesting this feature, it does not seem to be in the list for now.

Endomondo does not offer any API to query information, but I noticed that when it’s not the active application it posts a notification with some very useful information. Since I heard that it’s possible for Android application to catch the notification messages posted by other programs, I decided to write my own adapter for Pebble.

Example notification

Example notification

It proved to be quite difficult to extract the sent information since it’s wrapped into RemoteView object, which does not provide any useful way to tinker with its contents. Finally I found an example from the Stack Overflow which gives an example how do this. Unfortunately the only way seems to be using introspection which is never recommended but seems to work.

The application gets the following information:

  • Duration of exercise
  • Calories burned
  • Heart rate
  • Distance

The information is sent to Pebble’s built-in sports application, so no extra application slot is used from the watch. Unfortunately the watch app is not customizable. It has a display for pace and speed and neither of those is available from Endomondo, so I’m reusing those fields for calories and pulse. User can toggle between these numbers by pressing the middle button on the watch.

The watch application will start automatically when Endomondo starts pushing notifications. The included Android app only displays some instructions and is required by the Play store. The actual program runs as a service on the phone and it needs to be given access to application notifications from the settings menu.

Application source code is available here:

Installable application is available from the Play store against small support fee:

Disclaimer: This application is not associated with Endomondo® or Pebble®

Categories: Uncategorized

DIY Remote shutter release for Samsung NX-series cameras

30/04/2013 210 comments

I’m using Samsung NX1000 for aerial photography. The camera has a nifty feature of using smartphone as a remote viewfinder and shutter release but unfortunately the good idea is watered by buggy and limited program and the feature freezes the whole camera all too often. Fortunately there is a simple way of triggering the shutter via cameras usb-port. The trick is to have 68K resistor between ID and GND pins. After this USB data lines can be used to trigger camera focus and shutter.



Tip: If you have spare micro-usb cables, it’s easy to source a connector from the cable that came with the camera. Just squeeze black plastic around the connector with a pliers and the plastic casing will crack open exposing the connector. The connector on the cable has a small pcb, which makes it easy to solder the required resistor in place. If you use smd resistor, the casing can even be reassembled.

The cable described above works fine for manual use, but to use the camera for aerial photography some interface for rc receiver is needed. Fortunately this is easily achieved with a small arduino program, which reads pwm value from receiver servo port and then pulls either shutter or focus line low based on channel value. The compiled code size is under two kilobytes, so it’s possible to use small and inexpensive microcontroller like AtTiny2313.


RC interface for camera

The schematics and sources can be found at:

Compatible with (at least) following models: NX20, NX210, NX1000, NX1100 and NX2000

Update: If you don’t want to make your own, I’m selling these ready made. Just drop me a message.

Shutter PCB's

Shutter PCB’s