My own burn down chart

chartLike many software developers loving development, I spend a large part of my personal time on development projects. Some of them originate from relatives' or friends' requests. When they ask me for a delivery date, I try to commit to the date I give them. Name this pride or simply good project management Wink. But in any case I have the need of a (simple) tool for project planning and tracking.

IoT device development kits

boardA running list of IoT development kits, mostly for devices and device connectivity

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Lightning shutter trigger 2.0 - another picture

flashYesterday, we got a thunderstorm. Usually, when people are on vacation, they prefer a nice weather. This is not the case for us Smile. We took the car, and drove to a place a few kilometers southwest of Ancelle, the small village where we are staying for a week, in south of french Alps.

Our flash detector triggered several times, but we got only two pictures. Only one displays a flash. The other one was triggered by a distant intra-cloud lightning, and it's hardly visible on the picture. Other detections came from flashes in our back (yes!) or on our sides. Conclusion: I'm happy with sensitivity of this version of the trigger Smile.

Playing with Play - 2

playMain concepts (for Scala)

Keypoints of Main concepts for Scala page.

HTTP programming

An Action handles a Request and generates a Result.

A Controller is an object that generates Action values.

The built-in router translates each incoming request to an Action. Routes are defined in conf/routes. Each route is defined by three parts:

  • HTTP method
  • URI pattern
  • call definition

Lightning shutter trigger 2.0 - first pictures

flashToday, with my youngest son, we were able to test in real conditions the new version of the lightning shutter trigger, thanks to a thunderstorm which appeared in the beginning of the afternoon.

The idea was not to spend time on picture quality, but just to check trigger sensitivity. And the results are good: every lightning flash was detected, even two ones that happened in our back and one that we did not see! Additionally, I realized that there is no need for an opamp in the circuit: for every picture, the trigger sets itself in non amplified mode (I implemented an automatic switch between amplified and non amplified mode).


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