I think this program actually takes one more picture than is wanted. I fixed that by changing the for loop to:
For i,quantity,1,-1

Thanks for the fix... those boundary conditions always elude me in these quick jobs.

This post is fantastic (in theory) :) i'm making a time-lapse video for a class and was looking for a way to avoid standing in the closet with a stopwatch.

I'm running into trouble with the program though, and i believe it's happening between lines 7-10. Although i coded everything identically to the example, when i run the program, it doesn't display the time as "{0 0 0 50}" but rather as "timecnv(50)", and subsequently gives me an error - "a test did not resolve to TRUE or FALSE"

I'm using a TI-89 and a Canon Rebel XT

Any thoughts?

Without seeing your code, it looks like you typed timecnv(50) instead of timeCnv(50)... note the capitalization of the "C". Thanks for the kind words

Thank you for the feedback.

The capitalization was my instinct as well, buti doublechecked and the command is written correctly in the code. my code says timeCnv, but displays timecnv.

is there any way to simplify?

Also, i'm using a regular TI-89, not the Titanium. Could that be the culprit? perhaps that's a function it doesn't support?

The code in question is only used to help you figure out how long its going to run for in days, hours, minutes and seconds. Try changing lines 8-12 to:

quantity*interval→total
Disp "This will run for…"
Disp total
Disp "Seconds"

Then you can just figure out how long it runs yourself

Thanks for the update to the code. I also have a non-Titanium TI-89, and I'm having similar issues. I had already tried just removing lines 8-12 since it wasn't crucial to me. Now I have another problem though, at line 16. It seems like the checkTmr function might now work right (or at all) on my TI-89. I can use startTmr() out on the home screen, and it returns a value like you would expect. I can even use the startTmr() and store the value to a variable correctly, just not checkTmr. (I get an argument error, without any other details)

Has anyone else had a similar problem? I figured I'd have to write the code in a different way to get around this if I can't get checkTmr to work, but the original design here seemed much cleaner than something I would write...

Bad news... after some guidebook research (here), it seems as though the ti89 does not support the same time based commmands as the ti89 titanium. Perhaps the original instructable article is better for you... you can experiment with the time it takes to get through a while loop. Or maybe pick up a used ti89 from ebay. Sorry

I had read through the manual too, so I knew it wasn't explained very well, but the functions did exist in the catalog, so I kept trying. I got your code to work, exactly as it should too, thanks for writing it and all your help. To get it to work I flashed the OS to the newest version. It didn't make any sense, because I had v2.09 before, and I flashed it to the same (2.09, the newest out for the TI-89, dated 3/27/2003) version using TI-Connect, but whatever it did fixed what was wrong with my calculator.

Be careful when upgrading because it does wipe your memory clean in the process, but I backed up my RAM and Archive beforehand, then restored it back to get this result.

Thanks Colin, you probably just figured out the solution to most peoples problems regarding this post. Kudos

I can't find the cable that came with the TI-89 so I need to get a new one. Are you using a mono or stereo cable? Got any sources??

try this one

I get an "Argument Error" when I input the "number of pictures quantity".

I simply copy and pasted the code you provided into a notefolio file, then copied that info while in the notefolio app, and pasted it into a program. Hit enter, and then opened it up via "camera()".

Any idea what I could have done wrong? I'm not a programmer by any means, so I don't know this calculator very well. Just happened to have it on hand and thought I'd give your tutorial a shot.

Thanks.

@James

I would just manually type in the program in the calculator. I am unfamiliar with notefolio and it might be adding some formatting or something to the text. You need to open the program editor and try there.

I don't undertand how the functions work while programming with the TI-89 Calc. Can someone help me? Here is the erro message I get when I execute the code, "ERROR: A test did not resolve to TRUE or FALSE" It seems to me as my arguments aren't getting passed to the function. Please someone help...

I have the newer version of the TI-89, aka Titanium.

@Didum, on your TI-89, go to HOME -> ProgramEditor -> Open camera(), and send me an email with everything inside (exactly as you typed) by clicking on my pic (top right side of this comment)

Coneybeare, I have emailed you the code. In the email, I had the main program written first and followed by the function, namely, fctn(mach,beta). Both of these programs are written separately. When I execute the program, the same error keeps coming up: A test did not resolved to TRUE or FALSE. Thanks for your time.

@Didum, The code you sent me was for another program... If you are having trouble with the camera() prgram, please email the code for camera(). Otherwise, I suggest getting generic TI89 programming help here

The code I sent you is the one I'm having problems with. I have gotten it to work, but not in the same fashion I had it programmed in MATLAB and that is where I'm trying to get to. When you look the code I sent you, is there anyway you can tell me why I'm getting "A test did not resolved to TRUE or FALSE" even though this program is not same as camera()? Will it be the expression I had in the while loop or what could be a possible explanation?
Thanks for your time.

Hi, First off, Great Code. Second, I keep getting a "syntax error" on line 14 at "-1". Any help will be appreciated. Thanks.

For other applications with the calculator-camera combination I've built a site. It's Dutch and for many other TI calculators. I link to your site (and will use some info of it, translated to Dutch) for the TI-89 PRGM. Thanks!

Doesn't seem to do anything with my SONY R1, does anyone tried it on other than Canon?
I didnt try the whole code
just

Try
Send {1}
Else
ClrErr
EndTry

can anyone help please

If its not working checkTmr() function try to change from approximate to auto mode - then its workingè Thanks for the code! (Tryed on a Voyage 200)

Hi, thanks for this code! I'm very excited to start using it. However, whenever I try to run the program, I get a syntax error. It brings me to Line 15 and puts the cursor between the - and 1. Do you have any suggstions?

Thanks again!

Is it possible that the - you entered in is a dash and not a negative sign?

I feel like an idiot now. I put in a minus sign instead of a dash. Sorry for the confusion and thanks for the response.

I tried this using a TI-92. My camera is currently borked - nothing operates the shutter now, not the button, wireless remote, or the calculator. So don't try it with a TI-92! If anyone has any ideas of how to fix my camera, please let me know.

Make sure that you also clear out your a-z variables, namely "t" before trying to run the program. I think that was Colin's issue. It worked! Now I just need to buy or make a cable to try it out.

so i put the code in my ti-89 titanium, cleared my vars and set the mode to auto, however the camera only wants to pop the flash and focus. it refuses to fire at all. its a canon rebel xt. any help would be greatly appreciated.

I also cant ge tthe camera to fire. The code is running jsut fine, but the camera wont actually take a shot. Anyone know whats going on?

I have a new problem. The camera won't stop firing. I think it is the calculator trying to send signals instead of the camera. The reason I think this is because the calculator will not turn off if the linking cable is in. And if it is off when I plug the linking cable in, the calculator turns itself back on.


@Ben and Woody
It sounds to me like your problem is with the camera settings. You should have the camera set to manual in every possible way. Try changing the mode dial to "M" and turning off auto focus.

I solved my own problem. The camera must be in Single Shooting mode to work with the calculator. ALSO, I need to plug my camera into the link cable and turn on the CAMERA, then the calculator must be OFF as I plug the link cable into the calculator.

This is the solution that works for me. I am using a modification of this program because I have an Original TI-89 which does not have the Time Functions used. Even though I am a special case, I figured I would post my findings here incase it helps others.

I have a G10 and a Ti-89 Titanium. The camera focus and beeps, but the shutter never actually snaps. Help!

@ Goedhart

ya, i figured out that everything had to be manual and i came back here to post but the site had been down so i forgot to until now.

I am buying a new ti 89 T and I would like to run this program but I am concerned that it will hurt my new calc. If you could claify on how this works it would be a great help. thanks

Has anyone created a code for the Ti-89 "non-titanium" yet??? I've looked everywhere and have not been successful.

I love time-lapse and want to make this work soooo bad. Thanks...

Hi, I have a G10 too, and the smae problem as Scott. The camera only wants to focus (+bleep).

what can we do?
has it something to do about "Send {1}"?

You can try sending other values. I don't think it will mess up the camera at all. That being said, I am not responsible...

I tried values from 0 to 10, still nothing.
I also tried this:

Send{1}
Send{1}
Send{1}

still nothing

You can try sending a second parameter to the function: send{1, 2}, I think I remember there being a duration arg

You can try sending a second parameter to the function: send{1, 2}, I think I remember there being a duration arg

it looks like it needs an extra push...

G10+ 89 ti and same problem, tried
Send {1}
Pause
Send {1}
still no luck, any ideas?

I'm trying to take 3 exposures for an HDR timelapse.How can I modify this so that it takes 3 consecutive shot every interval with the auto-bracketing on the camera?

Thank you so much for this code, it's brilliant! I apologize for being a noob at coding though =(

The command that triggers the exposure is Send {1} so you will have to put that in 3 times. I am not sure what auto bracketing is or how to do it, but if it truly auto... then you should only have send the Send command. The calculator is probably going to be faster than the camera though so you would have to include a sleep inbetween the 3 sends. Please see some online docs at the TI sites to see how to do this.

will this work with my rebel xsi?

@patrick It certainly wont hurt to try it out!

Ill let you guys know if it works!

@patrick riley

have you news about the auto-bracketing ?


regards

I got this to work with a Canon G10, but had some problems. First I did not have a cable so I used two headphone 3.5mm to 2.5mm (has 4 connections)and a 3.5 stereo patch cable. this did not work, it only focused. When I used one 3.5mm to 2.5mm stereo (has 3 connections)adapter instead on either side of the patch cable the camera fired. I have ordered a 2.5 stereo patch cable hoping that will also work. The problem i have now is that the shutter is always "hot" or pressed. Not a big deal but forces the last image to show on the LCD till the next shot. This wasted batteries, any way around this?

I watch this guy for year, yea he do a lot of crazy stuff, but I know he is a really good and nice person. My boyfriend got his all best fights and we probably going to pray today and watch his in ring - so sad love you Mike.

Hi! Does anybody know which value I have too send to my EOS 450D? {1} doesnt work...

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