• Blackmagic ATEM Tally Switcher

    This is the help page for my Tally Switcher.

    I created an arduino project for a tally light. The design plans are available here.
    The software (mac only) is available at the App Store:

    You can connect to a Blackmagic ATEM switcher by IP address.
    You can setup IP addresses for the tally lights. If an IP address is provided, the software will send a http request in the form of:
    to the tally light.
    It should respond with 'OK' (two bytes) only if it received the GET request correctly.


    How to build the Tally :
    DISCLAIMER: I am not a professional electronics designer, I'm only self taught and I builded this project with trial and error. I don't give any warranty on the information below.

    I used a UNO+WiFi R3 , actually only the ESP8266 processor is used (the arduino is bypassed), so maybe it can be done cheaper and with a smaller chip.


    Tallylight ESP8266 code:
    (At line 27 add your Wifi Access point credentials).

    3d printer files:

    JVTallyBox stl files.zipJVTallyBox stl

    Electronic scheme (made with

     Schermafbeelding 2021-07-20 om 14.05.57.png

    Hardware list:
    2 green leds
    2 red leds
    UNO+Wifi R3 (+ antenna)
    2 resistors 30 Ohm (100 is probably to much, you could experiment with a little higher or lower, depending on how much light comes of the resistor.