Have seen several implementations of real time synchronous transfer from a projector to a Video Cam or DSLR. Here is one of the older implementation using the discrete components:
http://djcarlst.provide.net/19960525.htm
I wanted to do something similar using a DSLR in hi rez video mode, taking the Vsync to sync the motor. An IR sensor can be used on the cam blades as the compare input. The idea sounds pretty doable to implement but I never had enough motivation to try it. Wonder if anyone in this forum tried it.
Here are some details.
Use the MSP430 as the main controller of the system.
The motor steed is checked by the optocoupler. Something like this one:
Digikey 511-1351-ND
The camera HDMI connected to the HDMI-VGA adapter
https://www.amazon.com/dp/B075GZ8DX7
Route the optosensor and Vsync from the VGA adapter into the MSP.
The sw then compares the two signals using the MSP430 interrupts, similar to this:
https://circuitdigest.com/microcontr...omposer-studio
The MSP then adjusts the motor speed by changing the PWM duty cycle
https://www.ti.com/lit/an/slaa497/sl...oogle.com%252F
https://coder-tronics.com/category/msp430/page/2/
The PWM signal then can be fed into the motor driver.
https://media.digikey.com/pdf/Data%2...RI0002_Web.pdf
With this setup the camera records at 30FPS. The cam speed in lock state is at 20 FPS and with 3 blades it is 60 pulses per second.
Since the motor is locked to the camera sync, no flicker should be present in the captured video.
http://djcarlst.provide.net/19960525.htm
I wanted to do something similar using a DSLR in hi rez video mode, taking the Vsync to sync the motor. An IR sensor can be used on the cam blades as the compare input. The idea sounds pretty doable to implement but I never had enough motivation to try it. Wonder if anyone in this forum tried it.
Here are some details.
Use the MSP430 as the main controller of the system.
The motor steed is checked by the optocoupler. Something like this one:
Digikey 511-1351-ND
The camera HDMI connected to the HDMI-VGA adapter
https://www.amazon.com/dp/B075GZ8DX7
Route the optosensor and Vsync from the VGA adapter into the MSP.
The sw then compares the two signals using the MSP430 interrupts, similar to this:
https://circuitdigest.com/microcontr...omposer-studio
The MSP then adjusts the motor speed by changing the PWM duty cycle
https://www.ti.com/lit/an/slaa497/sl...oogle.com%252F
https://coder-tronics.com/category/msp430/page/2/
The PWM signal then can be fed into the motor driver.
https://media.digikey.com/pdf/Data%2...RI0002_Web.pdf
With this setup the camera records at 30FPS. The cam speed in lock state is at 20 FPS and with 3 blades it is 60 pulses per second.
Since the motor is locked to the camera sync, no flicker should be present in the captured video.
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