Sx40 motion detection - General Help and Assistance on using CHDK stable releases - CHDK Forum
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Sx40 motion detection

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Offline Gixxerk4600

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Sx40 motion detection
« on: 26 / December / 2012, 10:34:30 »
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Hi everyone, tried doing a search but was t able to find what I was looking for. Basically I want to use the motion detection to take one picture when there is motion. But at the moment the two scripts already on, seem to constantly take photos once it has detected motion!

Can anyone explain why and how to resolve?!

Thanks very much,

Matt
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Offline waterwingz

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Re: Sx40 motion detection
« Reply #1 on: 26 / December / 2012, 11:09:17 »
Quote from: Gixxerk4600 on 26 / December / 2012, 10:34:30
Can anyone explain why and how to resolve?!
That's a fairly simple script,  intended as an example rather than a fully functional shooting script.

Documentation for the motion detect function can be found here :

http://chdk.wikia.com/wiki/Motion_Detection

Typically,  to solve your problem you want to increase the threshold value (f) and start delay (p).   This will respectively change the amount of image change necessary to trigger a shot and add a small delay for the camera to "settle" before looking for motion after each shot.

Try f=40 and p=1000 as a starting point.  You will need to edit the script file.  It might be better to convert the script to set those as user parameter like this :

Code: [Select]
@title Motion Detect
@param f = sensitivity
@default f 40
@param p = interval (msec)
@default p 1000

a=6
b=6
c=1
d=300000
e=200
g=1
h=0
i=0 
j=0
k=0
l=0
m=0
n=0
o=2

do

md_detect_motion a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p

if( h > 0 ) then
shoot
endif

until (0)


HTH

« Last Edit: 26 / December / 2012, 11:13:47 by waterwingz »
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