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what is busybar-emulator fr?

maxswinkels/busybar-emulator — explained in plain English

Analysis updated 2026-05-18

7JavaScriptAudience · developerComplexity · 3/5LicenseSetup · easy

tl;dr

An unofficial local emulator for the Flipper BUSY Bar LED gadget, matching its real HTTP API, fonts, and animations so you can build and test apps before your hardware arrives.

vibe map

mindmap
  root((busybar-emulator))
    What it does
      Local HTTP emulator
      Matches real fonts
      Live web draw tool
      Scenario controls
    Tech stack
      Node.js
      Vue 3
      Python examples
    Use cases
      Test before hardware
      Simulate failures
      Export PNG or GIF
    Audience
      Developers
      Hardware tinkerers

Code map

Detail Auto

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filefunction / class

what do people make with this?

VIBE 1

Build and test a BUSY Bar app on your computer before the physical hardware arrives.

VIBE 2

Simulate low battery or offline conditions to check how your app handles them.

VIBE 3

Design a screen with the draw tool and export it as a PNG or GIF to share.

what's the stack?

Node.jsVue 3JavaScriptPython

how it stacks up fr

maxswinkels/busybar-emulatoranefzaoui/minecraft-server-managerboneskull/promwrap
Stars777
LanguageJavaScriptJavaScriptJavaScript
Last pushed2020-07-21
MaintenanceDormant
Setup difficultyeasymoderateeasy
Complexity3/53/52/5
Audiencedevelopergeneraldeveloper

Figures from each repo's GitHub metadata at analysis time.

how do i run it?

Difficulty · easy time til it works · 5min

Needs Node.js for the server and the web build step, example apps need Python 3.

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

in plain english

BUSY Bar Emulator is an unofficial local emulator for a small hardware LED display gadget called the Flipper BUSY Bar. It is not made by the company that sells the real device, and it exists so people can start building and testing apps for the BUSY Bar before their own hardware order arrives, or if they never get one at all. The real BUSY Bar works by receiving plain HTTP requests to draw text, images, and animations on its small pixel grid. This emulator copies that same HTTP API on your own computer, using the same fonts, the same 72 by 16 pixel animations, the same set of stock icons, and the same gamma correction that makes the real LEDs look a certain way. Because the API matches so closely, an app written to talk to this emulator should run on the real hardware without changes, other than pointing it at a different address. Running it locally starts a small web server with no external dependencies, plus a browser based control panel built with Vue 3 that mirrors the real device's screens for network, firmware, settings, and drawing. There is also a draw tool in the browser that lets you place text, shapes, and icons directly on the simulated screen and see it update live, and you can export what you made as a PNG image or an animated GIF to share. The project includes several example scripts written in Python that show off different things the emulator can do, such as showing a clock, playing a themed status animation, drawing a weather icon, or animating a fire effect. The emulator also adds scenario controls not found on the real device, like faking a low battery, going offline for a while, or having another app take over the display with a higher priority, which are useful for testing how a real app behaves in less than ideal conditions. Community made apps for the BUSY Bar are shared in a separate linked gallery repository. The project is licensed under the MIT License.

prompts (copy fr)

prompt 1
Help me clone busybar-emulator and run the local server with node server.js.
prompt 2
Write a Python script that draws a clock on the BUSY Bar emulator using its HTTP API.
prompt 3
Explain how the priority field in a draw request causes a 409 conflict on the BUSY Bar.

Frequently asked questions

what is busybar-emulator fr?

An unofficial local emulator for the Flipper BUSY Bar LED gadget, matching its real HTTP API, fonts, and animations so you can build and test apps before your hardware arrives.

What language is busybar-emulator written in?

Mainly JavaScript. The stack also includes Node.js, Vue 3, JavaScript.

What license does busybar-emulator use?

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

How hard is busybar-emulator to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is busybar-emulator for?

Mainly developer.

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