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A compact photodetector for serial comms to a robotic pano rig

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Offline Microfunguy

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A compact photodetector for serial comms to a robotic pano rig
« on: 07 / July / 2009, 19:40:12 »
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While developing a robotic camera rig for panoramas, the need for a photodetector mounted above the camera Print button arose.

The sensor had to allow the button to be operated and be unaffected by bright, ambient light.

The solution is shown below.


A surface-mount photo-transistor is mounted in an aluminium tube that fits inside an O-ring.
The O-ring attaches to the camera with double-sided tape.
The tube is connected to the O-ring with resilient black vinyl material so that the Print button may be operated.
The electrical connections are to two gold-plated sockets spaced 2.54mm apart.
« Last Edit: 07 / July / 2009, 19:43:35 by Microfunguy »
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Offline staylo

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #1 on: 20 / July / 2009, 18:15:07 »
Interesting! Any progress on serial comms?
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Offline Microfunguy

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #2 on: 20 / July / 2009, 18:45:22 »
Quote from: staylo on 20 / July / 2009, 18:15:07
Interesting! Any progress on serial comms?

Yes, it is working fine.
It is a very simple method, it just sends three bytes twice.
The receiving device can acknowledge it has received the bytes correctly but does not have to.
The uBasic command 'send_data a,b,c'  is used.

Someone is working on a far more sophisticated serial comms feature that is faster, has extensive error-checking and allows a master camera to talk to a slave.
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Offline bugsplatter

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #3 on: 20 / July / 2009, 19:13:10 »
Quote from: Microfunguy on 20 / July / 2009, 18:45:22
Quote from: staylo on 20 / July / 2009, 18:15:07
Interesting! Any progress on serial comms?
Someone is working on a far more sophisticated serial comms feature that is faster, has extensive error-checking and allows a master camera to talk to a slave.

Is anyone working on unlocking the serial console built into firmware?
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Offline Microfunguy

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #4 on: 20 / July / 2009, 19:18:39 »
Quote from: bugsplatter on 20 / July / 2009, 19:13:10
Is anyone working on unlocking the serial console built into firmware?

I do not know of anyone doing that.
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Offline yair

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #5 on: 24 / July / 2009, 09:24:02 »
hi david,
i hacked a moving light rig for panoramas myself, see here
[noembed]http://vimeo.com/5552505]moving camera head[/noembed]
its just a proof of concept, didn't take a single picture with it yet.

to my question, whats the purpose of your photo sensor hack?
do you want to use it for detecting when a shot was made?
can you control the print led at sufficient intervals to pass more info?

« Last Edit: 24 / July / 2009, 14:36:42 by yair »
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Offline Microfunguy

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #6 on: 24 / July / 2009, 09:37:00 »
Quote from: yair on 24 / July / 2009, 09:24:02
i hacked a moving light rig for panoramas myself, see here


Very nice !
I know someone who will be very interested in this, I will send them the details.

Quote
whats the purpose of your photo sensor hack?

Someone making a robotic head similar to yours wants to send the zoom position and parameters entered into a script to a Picaxe.
Picaxe will then know how many photos to take and how many rows, etc.

Quote
can you control the print led at sufficient intervals to pass more info?

You can pass three bytes of information with each 'send_data' command.

I am just finishing the documentation but require certain information.

You should have received an email from me earlier.


David


[/quote]
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Offline yair

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #7 on: 24 / July / 2009, 09:48:25 »
waiting for the documentation, microcontrolling chdk is the way to go!

btw. yes, i [just saw] received your email and will act on it asap.
btw2. do you know why i seem to show the vimeo video twice? i used
Code: [Select]
[url=http://vimeo.com/5552505]moving camera head[/url]
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Offline Microfunguy

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #8 on: 24 / July / 2009, 10:45:29 »
Quote from: yair on 24 / July / 2009, 09:48:25
do you know why i seem to show the vimeo video twice?

According to acseven, you have to place the link between [ noembed ][ /noembed ] tags.

Who makes these 'moving light' devices ?


David
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Offline yair

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Re: A compact photodetector for serial comms to a robotic pano rig
« Reply #9 on: 24 / July / 2009, 12:09:25 »
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