MudAndSnow
Posts: 5
Joined: Tue Oct 17, 2017 10:23 pm

Low power pictures

Tue Oct 17, 2017 11:15 pm

This is my first PI project so please excuse my noobness.

Project: Motion activated battery powered camera with long battery life.
Speed: Take picture within 1 second of motion trigger.
Problem: PI draws too much power while on so it must be powered off until motion trigger but it doesn't look like it can boot in less than 1 second.

Is there any way I can hack an image sensor to take and store a picture quickly while the PI boots up and then once the PI is booted, it reads the picture?

Thanks for any suggestions.

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Gavinmc42
Posts: 1512
Joined: Wed Aug 28, 2013 3:31 am

Re: Low power pictures

Wed Oct 18, 2017 7:47 am

Not within 1 second low power on a Pi.

This can do it and has long battery life.
http://www.digilant.com.au/products/catch-em-cam

However if 3 seconds is ok it can be done with a Pi.
Camera software on Ultibo will boot is 3sec but for low power you will need some that can detect motion and then turn the Pi on.

Something like this controlling a power switch IC/transistor/power supply
http://au.element14.com/panasonic-elect ... dp/2095731
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges

MudAndSnow
Posts: 5
Joined: Tue Oct 17, 2017 10:23 pm

Re: Low power pictures

Wed Oct 18, 2017 4:38 pm

Thanks Gavin. I have a PIR motion sensor sourced already and am looking for a device where an MCU or PI can have access to the images to process them. I do like the external trigger feature on that camera though.

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Gavinmc42
Posts: 1512
Joined: Wed Aug 28, 2013 3:31 am

Re: Low power pictures

Thu Oct 19, 2017 1:50 am

PIR triggered for game camera, RTC triggered for timelapse.
Someone should make a hat.
Unless the Pi is on all the time no per trigger images can be done, but 3 seconds is ok for time lapse.

Battery life is dependent on duty cycle.
Pi Zero with camera 300ma? ~= 10hours with 3000mahr battery.
turned on 300ma for 5 seconds every minute ~= 120hours
The trick to to make the movement sensor the lowest power possible
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges

MudAndSnow
Posts: 5
Joined: Tue Oct 17, 2017 10:23 pm

Re: Low power pictures

Thu Oct 19, 2017 3:58 pm

I am looking for about 3 months battery life with about 30 pictures a day. I am hoping the motion sensor is the only thing normally on but I am not sure if cameras exist that can turn on or wake up and take a picture in less than 1 second.

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