--- title: "DIY Wireless Tally System(자작 무선 탈리만들기)" url: "https://maker.wiznet.io/TheoIm/projects/diy-wireless-tally-system---/" markdown_url: "https://maker.wiznet.io/TheoIm/projects/diy-wireless-tally-system---/md" type: "UCC: User Created Content" author: "최기현" author_url: "https://search.naver.com/p/crd/rd?m=1&px=429&py=34716&sx=429&sy=216&vw=1674&vh=944&bw=672&bh=37293&bx=151&by=34526&p=jfQATdqVOZCsskW2F7lssssssdo-013866&q=%EC%9D%B4%EB%8D%94%EB%84%B7%EC%89%B4%EB%93%9C+%2B+%EC%95%84%EB%91%90%EC%9D%B4%EB%85%B8&ie=utf8&rev=1&ssc=tab.cafe.all&f=&w=&s=%2FPxEKhIGB8NE3gm9myikUtAp&time=1764221561553&abt=%5B%7B%22eid%22%3A%22QR-PWL-NX%22%2C%22vid%22%3A%226%22%7D%2C%7B%22eid%22%3A%22QAC-RANK-ADAPT%22%2C%22vid%22%3A%226%22%7D%2C%7B%22eid%22%3A%22SMART-SPORTS%22%2C%22vid%22%3A%221%22%7D%5D&a=caf*g.cafe&r=195&i=90000004_00ED0F2300002CFC00000000&u=https%3A%2F%2Fcafe.naver.com%2Fdvcam1%2F11516%3Fart%3DZXh0ZXJuYWwtc2VydmljZS1uYXZlci1zZWFyY2gtY2FmZS1wcg.eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJjYWZlVHlwZSI6IkNBRkVfVVJMIiwiY2FmZVVybCI6ImR2Y2FtMSIsImFydGljbGVJZCI6MTE1MTYsImlzc3VlZEF0IjoxNzY0MjIxNTU0Njk5fQ.Id-uIyhKQmao9i8GA-IKkUejxGiNKuwKB7kTkdLfIH8" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "최기현" original_url: "https://search.naver.com/p/crd/rd?m=1&px=429&py=34716&sx=429&sy=216&vw=1674&vh=944&bw=672&bh=37293&bx=151&by=34526&p=jfQATdqVOZCsskW2F7lssssssdo-013866&q=%EC%9D%B4%EB%8D%94%EB%84%B7%EC%89%B4%EB%93%9C+%2B+%EC%95%84%EB%91%90%EC%9D%B4%EB%85%B8&ie=utf8&rev=1&ssc=tab.cafe.all&f=&w=&s=%2FPxEKhIGB8NE3gm9myikUtAp&time=1764221561553&abt=%5B%7B%22eid%22%3A%22QR-PWL-NX%22%2C%22vid%22%3A%226%22%7D%2C%7B%22eid%22%3A%22QAC-RANK-ADAPT%22%2C%22vid%22%3A%226%22%7D%2C%7B%22eid%22%3A%22SMART-SPORTS%22%2C%22vid%22%3A%221%22%7D%5D&a=caf*g.cafe&r=195&i=90000004_00ED0F2300002CFC00000000&u=https%3A%2F%2Fcafe.naver.com%2Fdvcam1%2F11516%3Fart%3DZXh0ZXJuYWwtc2VydmljZS1uYXZlci1zZWFyY2gtY2FmZS1wcg.eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJjYWZlVHlwZSI6IkNBRkVfVVJMIiwiY2FmZVVybCI6ImR2Y2FtMSIsImFydGljbGVJZCI6MTE1MTYsImlzc3VlZEF0IjoxNzY0MjIxNTU0Njk5fQ.Id-uIyhKQmao9i8GA-IKkUejxGiNKuwKB7kTkdLfIH8" published: "2025-11-27" language: "en" hardware: ["Arduino Mega 2560", "Arduino Ethernet Shield"] likes: 0 views: 391 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # DIY Wireless Tally System(자작 무선 탈리만들기) > A custom DIY wireless tally system built with Arduino Mega(with Ether Shield), Nano, and NRF24, supporting ATEM, Vmix, DataVideo, Sony, and AVMatrix switchers. Original author: 최기현 (source: https://search.naver.com/p/crd/rd?m=1&px=429&py=34716&sx=429&sy=216&vw=1674&vh=944&bw=672&bh=37293&bx=151&by=34526&p=jfQATdqVOZCsskW2F7lssssssdo-013866&q=%EC%9D%B4%EB%8D%94%EB%84%B7%EC%89%B4%EB%93%9C+%2B+%EC%95%84%EB%91%90%EC%9D%B4%EB%85%B8&ie=utf8&rev=1&ssc=tab.cafe.all&f=&w=&s=%2FPxEKhIGB8NE3gm9myikUtAp&time=1764221561553&abt=%5B%7B%22eid%22%3A%22QR-PWL-NX%22%2C%22vid%22%3A%226%22%7D%2C%7B%22eid%22%3A%22QAC-RANK-ADAPT%22%2C%22vid%22%3A%226%22%7D%2C%7B%22eid%22%3A%22SMART-SPORTS%22%2C%22vid%22%3A%221%22%7D%5D&a=caf*g.cafe&r=195&i=90000004_00ED0F2300002CFC00000000&u=https%3A%2F%2Fcafe.naver.com%2Fdvcam1%2F11516%3Fart%3DZXh0ZXJuYWwtc2VydmljZS1uYXZlci1zZWFyY2gtY2FmZS1wcg.eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJjYWZlVHlwZSI6IkNBRkVfVVJMIiwiY2FmZVVybCI6ImR2Y2FtMSIsImFydGljbGVJZCI6MTE1MTYsImlzc3VlZEF0IjoxNzY0MjIxNTU0Njk5fQ.Id-uIyhKQmao9i8GA-IKkUejxGiNKuwKB7kTkdLfIH8) ## Components - **Arduino Mega 2560** x 1 ([docs](https://www.farnell.com/datasheets/1674878.pdf?_ga=2.12759806.871556650.1519619484-654667508.1508905608&_gac=1.209399078.1518779130.EAIaIQobChMI97my66Sq2QIV77ftCh01kgA_EAMYASAAEgKPyvD_BwE)) - **Arduino Ethernet Shield** x 1 ([docs](https://docs.arduino.cc/retired/shields/arduino-ethernet-shield-without-poe-module)) ## Article ## ✔ DIY Wireless Tally System Project (Arduino Mega + Nano + NRF24L01) **by Choi Ki-HyunOriginally shared in a Korean pro-broadcasting community where live-production directors exchange technical knowledge.** Tally systems are essential in analog switchers and live broadcasting environments. In this project, I built a **fully wireless tally transmitter/receiver system** that supports multiple switchers such as **Vmix, DataVideo, Sony, AVMatrix, and Blackmagic ATEM**, and displays tally status using wireless LED modules. --- ## 1) System Overview This project is divided into two main components: **Transmitter** and **Receiver**. #### ✦ Transmitter Arduino Mega **Arduino Ethernet Shield (W5100)** ← **highlighted as the network interface** NRF24L01+ PA/LNA (long-range) #### ✦ Receiver Arduino Nano NRF24L01 (3.3V powered) #### ✦ Communication 2.4GHz NRF24L01 wireless link Supports Vmix / DataVideo / Sony / AVMatrix / Blackmagic ATEM Output: G/R Tally Lamp (up to 6 channels) The transmitter receives tally signals from the switcher and sends them wirelessly. Each receiver uses an LED module to show **Preview (Green)** and **On-Air (Red)** states in real time. --- ## 2) Transmitter Details ![](https://maker.wiznet.io/upload/ckeditor5/857264738%5F1764255655%2Epng) The transmitter is built around an **Arduino Mega + W5100 Ethernet Shield**, parsing each switcher’s protocol and sending tally data to the wireless module. ![](https://maker.wiznet.io/upload/ckeditor5/857264738%5F1764255855%2Epng) #### ✦ Main Features Ethernet-based ATEM protocol decoding Vmix REST API / DataVideo / AVMatrix support LCD menu for selecting switcher mode (Sony MCX-500 / DataVideo SE-1200 / AVMatrix VS-0601, etc.) ![](https://maker.wiznet.io/upload/ckeditor5/857264738%5F1764255566%2Epng) #### ✦ Hardware Configuration Power switch, reset button, mode selector D-SUB port → accepts external wired tally signals to retransmit wirelessly Ethernet port for Vmix/ATEM External antenna + long-range wireless module Internal layout: Mega board + NRF24 power module + wiring harness ![](https://maker.wiznet.io/upload/ckeditor5/857264738%5F1764255549%2Epng) --- ## 3) Receiver Unit ![](https://maker.wiznet.io/upload/ckeditor5/857264738%5F1764255620%2Epng) Each receiver displays tally information using a single dual-color LED. #### ✦ Receiver Features Arduino Nano NRF24L01 2.4GHz module Powered by 18650 battery + USB battery case Single LED behavior: **Green**: Preview **Red**: On-Air **Both ON → Orange mixed light** ![](https://maker.wiznet.io/upload/ckeditor5/857264738%5F1764255635%2Epng) --- ## 4) Circuit & Reference Material Reference material used during development: ATEM Library: Modified schematic & Arduino sketches: Included in attached ZIP Note: The original reference video had **A6/A7 pin numbers swapped**, so the schematic was redrawn correctly. --- ## 5) Component List | Category | Parts | | --- | --- | | MCU | Arduino Mega, Arduino Nano | | Ethernet | **Arduino Ethernet Shield(W5100)** | | Wireless | NRF24L01 + PA/LNA (Receiver uses standard NRF24L01) | | Display | LCD 1602 I2C | | Resistor | 220Ω (LED current limiting) | | Power | 18650 battery + USB power case | | Controls | Toggle switch, push button | | Others | Glue gun, strong adhesive, LED holders, connectors, hardware | Associated purchase links are available in the original Korean post. --- ## 6) Build Notes & Troubleshooting #### ● NRF24 Power Sensitivity The NRF24L01+PA module is very sensitive to noise. Transmitter operates on a stable 5V module Receiver runs on regulated 3.3V Adding **10µF–47µF capacitors** greatly stabilizes wireless performance #### ● T-Bar Signal Issue (ATEM) Based on the Blackmagic ATEM sketch, the T-Bar code is occasionally not interpreted correctly. Cause: internal ATEM protocol value changes + analog slider handling → Still investigating; community advice is welcome. --- ## 7) Completion & Testing ![](https://maker.wiznet.io/upload/ckeditor5/857264738%5F1764255785%2Epng) Full testing was performed with Vmix, DataVideo, and ATEM. All six channels responded correctly with **Preview / On-Air** states. Although only four receivers were assembled, the system architecture supports easy expansion. --- Source: https://maker.wiznet.io/TheoIm/projects/diy-wireless-tally-system---/