ATEM SDI PRO ISO, DIY tally lights, freeze

I build a DIY Arduino based wireless Tally system, which works adding a wifi router to the system (all credits to Aron Het Lam)

A few weeks ago, I was doing and outdoor job, 3 cameras and 3 tallys.
The ATEM was also direct recording to an USB SSD disk.

As It was and outdoor environment, probably that was also a busy wifi network environment.

After a few hours, the tallys stop to work, and the ATEM panel lights turn freeze, but still switching, the recording stoped.
The only solution was power cycle the ATEM.
After a while, freeze again.

Why the problem back again after a while?, I guess that the fast turn on-off was not enough to erase the connections cache.

The problem gone if the tally's become disconnected.

I did some test in home, not busy network environment, the system works perfect, 6 hours recording.

I know that ATEM Switchers only allow a limited number of network connections.
My guessing: If a connection drops and reconnects it will be "counted" as a new connection. This can result in exceeding the connection limit although the simultaneous connections are still lower than the limit. Exceeding the limit can result in the ATEM Switcher becoming unresponsive.

PDT: I'm using a very simple and cheap TL-WR741ND TP.LINK router, If I use the isolated AP mode could hep?

i dont know , how your tally works .. If I good undestand, all tally lamps has connected thru WIFI into atem .. Thats not good solution and u got this freeze .. Better thing is that any board will connect to atem directly thru LAN .. And Wirelles tally lamp is connecting into this board .. Thats works perfect ..

Wifi and UDP protocol of the Atem are kind of enemies of each other..

The Wifi introduces the issue as soon as a packet get lost or late.. The Atem will see this due to the internal timers inside the protocol keeping track of packets, Meaning 1/2 lost packets will result in a Sesion diconnect to that client. Client reconnects to Atem, needs to get in sync again.. Losses a packet and there we go again..

If you have a spotty wifi connection to 1 of your units it will do this in very rapid succesion until the atem goes down due to session overload.

Works great at home.. Yes with the tally lights close by the Wifi AP and without any unknown interference from the location you were shooting sure worked great..


The proper way for Tally lights would be Tally Arbiter or something in between the Atem and the Tally lights.

Tally Arbiter will connected hard wired ( from your laptop ) to the Atem. Having 1 Stable connection to pull all Tally data realtime.. And then distributes this tally info to the wireless tallies.. Without pulling a session for each tally light and issues with conenctions etc..
http://www.tallyarbiter.com/