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TI-89 program to do a time lapse photography on Canon SLR

I wrote a program for my ti-89 + rebel XTi to do a time lapse:
Prompt time
1->i
time*65 -> time
while 1=1
if mod(i,time)=0 then
disp i/time
try
Send list1 ### you have to make this and save it in main, I don't think the value's important
Else
EndTry
EndIf
i+1->1
EndWhile

it asks you for an interval in (approximate) seconds, then will have the camera take a shot on that interval.
now someone just needs to write a timer for bulb exposures.

Gabe
Sun, 30 Sep 2007 08:13:23 +0000

That's awesome, Gabe. Thanks!

Chieh Cheng
Mon, 01 Oct 2007 04:35:03 +0000

wah?! how would a calculator connect to a camera? im confused here! can someone enlighten me? cheers

Nathan Barlow
Thu, 04 Oct 2007 14:49:58 +0000

Canon's Rebel series has a E3 connector for focus and shutter trigger. The E3 connector is simply a sub-mini stereo audio connector (search for E3 and RS60-E3 on this site). The TI-85 scientific calculator (and many others like it, such as my Casio CFX-9850G) are programmable and have an external interface that also uses the sub-mini-stereo audio connector form-factor for communication with the PC.

Chieh Cheng
Thu, 04 Oct 2007 17:29:48 +0000

can you please attach the file apps of the TI 89, I cannot make this program to run on mine! I am so into time lapse photography, I have a quit error! I hqve been looking for that kind of program for month! (yeah, I am not into coding at all)

canaanproject at gmail dot com

Canaan
Sun, 28 Oct 2007 07:41:23 +0000

what do you mean by: "Send list1 ### you have to make this and save it in main, I don't think the value's important"

_> == "sto" right?

what does "if mod(i,time)=0 then" mean?

what is the difference between "try" and "EndTry", I cannot find them in the catalog, does "time" is the one in the catalog?

How can I make this thing work??? I am so looking forward to fix that problem, and I have a TI 84 silver edition by the way...
canaanproject at gmail dot com

Canaan
Sun, 28 Oct 2007 07:44:25 +0000

hi, I got this working on my ti89.
I use "starttmr()->timer" and "checktmr(timer)" to have a reliable time count.

Canaan, here are answers to your questions :
>what do you mean by: "Send list1 ### you have to make this and save it in main, I don't think the value's important"
He means you just need to provide a list, i.e a sequence of numbers between curly braces :
[code]
Send {0}
[/code]

-> == "sto" right?
yes.

>what does "if mod(i,time)=0 then" mean?
"time" is the period between two shots.
in other words, mod(i,time)=0 is true when i=k*time (with k an interger)

>what is the difference between "try" and "EndTry"
"try" intercepts errors. If you don't use them, the calculator will generate a "link transmission" error which will crash your program. EndTry is simply the end marker of the "try" method.

>does "time" is the one in the catalog?
huh?
cheers

Baptiste Lagarde
Sun, 06 Jan 2008 18:24:13 +0000

any chance you can send your ti-89 program to my email as well, zryder94 at gmail dot com?
thanks much!

Mike Thompson
Fri, 13 Jun 2008 03:08:02 +0000

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