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TinyC for Tasmota

TinyC is a C-subset compiler and VM that runs on ESP32 and ESP8266 as the Tasmota driver XDRV_124. Write C in the browser IDE, compile to portable bytecode, upload and run — no firmware rebuild, no on-device compiler.

TinyC browser IDE

Why TinyC

  • Portable bytecode — compile once, run the same binary on ESP32, ESP32-S3, ESP32-C3, or ESP8266.
  • No on-device compiler — the VM is ~12 KB of flash. Compilation happens in the browser.
  • Familiar C syntax — int, float, arrays, functions, for / while / if — no new language.
  • 10× faster than script interpreters — direct-threaded bytecode dispatch with no source re-parsing.
  • True background tasks — TaskLoop() runs in a dedicated FreeRTOS task (ESP32) with full delay() support.
  • Deep Tasmota integration — direct access to SML, I2C, display drivers, HomeKit, UDP multicast, webcalls.

Start here

  • Getting Started

    Enable USE_TINYC in your build, upload the IDE, write your first program.

  • Reference

    Full function reference — GPIO, I2C, SML, display, HomeKit, networking.

  • Examples

    Ready-to-run programs for sensors, displays, meters, and more.

  • Gallery

    Screenshots of real projects running on Tasmota hardware.

  • Releases

    Download pre-built firmware for testing.

  • Custom Builds

    Feature flags for trimmed or extended firmware variants.

Latest release

The latest test firmware, IDE bundle, and docs are always on the testing release tag.

Not affiliated with TCC / TinyCC

TinyC for Tasmota is an independent project unrelated to Fabrice Bellard's Tiny C Compiler (TCC / TinyCC). The two share a similar name but are different projects with different scope: TCC is a native x86/ARM C compiler, while TinyC for Tasmota is a C-subset compiler that targets a portable bytecode VM running inside Tasmota on ESP32/ESP8266.