14.12.2014 - Low power camera
So, low power time lapse camera.
The sensor is a JPEG camera common on Ebay, modded for 3.3V.
It's 640x480, with 1/3" sensor - good performance at night compared to cell phone ones or OV7670.
Averaging 48Kb per frame at max quality.
Storage on an microSD card.
An RF module to get status or download an odd frame.
With some design changes from the RF one i can make a camera that does 1 frame every 10 minutes for just under a year, on 8 alkaline D cells.
The limit is actually the 2 GB microSD card (if i won't bother with FAT32 support).
Big issue was the camera module, which used up 50mA even in power save mode.
With a P-FET above it, i can do a frame&write to microSD for 15 joules, or 90 joules per hour.
Add 1 joule/hour to ping the radio every 10 minutes and round off, that's 100 joules per hour.
A D cell stores about 60000 joules, and i need 4 of them to get the voltage.
So, 2 strings of 4 will give me about 200 days of runtime, in pessimistic estimate.
With that in mind, i built a new board and tried it out.
It writes a picture to an SD card without problems.
Power, however, does not want to play nice - the theory and practice diverged a bit in what is being considered "sleep mode" by various parts.
Namely, the RF module does not want to play ball and go below 2mA, and microsd card sucks lots of current from MOSI line when it's VCC is out.
A redesign incoming, but the basic idea seem to work.
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28.01.2017 23:49 - JosephExinc
|what is the value of capicitors C4 and C5 thank you|
14.09.2016 22:43 - noah
|Hey Nelson, you \\\\\\\"have been trying\\\\\\\" and yet want \\\\\\\"exactly the parts used\\\\\\\". That doesn\\\\\\\'t sound like trying but rather cloning aka mass production clone attempt.
I wouldn\'t see any reason as to why you would need the exact parts provided if you really would have tried that yourself.
04.05.2016 13:08 - not_nelson
|I have been trying to do the same thing that your doing for a while now can you please provide exactly the parts you use|
27.04.2016 00:57 - Nelson
|It's on the download page since a while ago. I guess i should have mentioned it in some visible place.|
26.02.2015 02:26 - Artlav
|Any news on when the firmware will be ready to download? I have a building project at work (a new school) that I'd like to film with a year long time lapse...|
25.02.2015 02:13 - Darren Jones
|Нет, не коммерческий. Прошивка скоро будет выложена - ещё нужна доработка.|
24.12.2014 23:48 - Artlav
|Очень интересный проект 5+, это коммерческий? или возможно увидеть файл прошивки. |
24.12.2014 23:10 - Alex
|Certainly, once i'm sure it is working reliably.|
23.12.2014 12:35 - Artlav
|will you make the code available?|
23.12.2014 03:26 - erik
|That would be "Ether" from Youtube audio library.|
22.12.2014 19:50 - Artlav
|Cool project -- whats the music on the Moscow time-lapse? Fits very well with the video.
22.12.2014 19:25 - Bob
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