Arduino Shield, Tally, and Control Data

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anthonythompson

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Arduino Shield, Tally, and Control Data

PostFri Sep 27, 2019 8:32 pm

We are building out a custom tally and CCU system for our studios, in which we have a current total of seven BMD URSA Mini 4Ks. We are feeding each of them tally from our two GV Kula switchers via a whole host of SKAARHOJ devices to translate the GPO from the switcher to the tally signals the BMD cameras expect on the SDI Return.

Basically, everything works great, if you don't need to feed tally to a prompter hood, which accepts tally via an optosensor. Since the URSA Mini 4K doesn't have any external source of tally that wouldn't trigger an optosensor when tally is not active, we decided to come up with a clever (to us) solution of putting an Arduino with the BMD 3G Shield in line with each camera. This device takes in the full return feed with tally and control data embedded, reads the tally information, enables an LED when program tally is set, and sends that tally data to the camera. The control data is set in the Arduino Sketch to just be passed through from shield input to the output.

If we connect the SDI Return directly to the camera, tally is passed and control data will shade the camera til the cows come home. Once the Shield is put in the signal chain between the return feed and the camera, tally continues to be passed without a problem, but control data will STOP being passed after 5-10 minutes. So, control data will initially be passed, but eventually will just stop being passed to the camera.

Hopefully I've made this whole thing super confusing and hard to follow. Has anyone else run into this issue and have any clues as to where the control data is being dropped or ignored?
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Xtreemtec

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Re: Arduino Shield, Tally, and Control Data

PostFri Sep 27, 2019 9:23 pm

Dont put it in the return feed. Put the shield on the Front SDI out. and program it to listen for Tally ID 0 ;)

The front SDI output sends Tally ID 0 This is also known as MonitorTally and is used with the EVF's to run the Tally. ( The clever thing about this.. Is that it follows the Camera ID. So if you set the camera to ID 7. Monitor ID 0 will output the tally of CAM ID 7. When you set the camera to CAM ID 4. Monitor ID 0 will output the tally of Cam ID 4. ;)

We have our own SDI Tally light. Which works perfectly in line with the EVF. :D ;)
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anthonythompson

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Re: Arduino Shield, Tally, and Control Data

PostFri Sep 27, 2019 11:48 pm

Xtreemtec wrote:Dont put it in the return feed. Put the shield on the Front SDI out. and program it to listen for Tally ID 0 ;)


Ok, this got me thinking in the right direction. I wasn't able to get the Shield to read Tally ID 0 using the Arduino's BMD Tally Control library, but I was able to read the tally brightness from the control data. Once I switched gears, I was able to pull that brightness data from the SDI feed to the studio viewfinder, use it to light the LED and let it continue to passthrough to the viewfinder.

Now, I need to figure out why the viewfinder will periodically lose picture and camera information, but at least the tally works!
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markkitus

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Re: Arduino Shield, Tally, and Control Data

PostThu Oct 17, 2019 3:40 pm

Xtreemtec wrote:Dont put it in the return feed. Put the shield on the Front SDI out. and program it to listen for Tally ID 0 ;)

The front SDI output sends Tally ID 0 This is also known as MonitorTally and is used with the EVF's to run the Tally. ( The clever thing about this.. Is that it follows the Camera ID. So if you set the camera to ID 7. Monitor ID 0 will output the tally of CAM ID 7. When you set the camera to CAM ID 4. Monitor ID 0 will output the tally of Cam ID 4. ;)

We have our own SDI Tally light. Which works perfectly in line with the EVF. :D ;)




Hi I can not make it work with the front output of the sdi when I put the id 0 does not work, if I put another id and plug it to the output of the switcher it is going to be perfect, I tested it in a 4.6k mini ursa

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