# GHI Electronics

> GHI Electronics builds **TinyCLR** — a royalty-free .NET runtime for embedded products — running on the **SITCore** family of secure ARM microcontrollers. Customers write **C# in Visual Studio or Visual Studio Code**, debug over USB with real breakpoints, and ship the same managed code across chipsets, modules, single-board computers, and dev boards designed and manufactured in the USA.

GHI Electronics is the company behind the original **FEZ** boards (FEZ Mini, FEZ Domino, FEZ Hydra, FEZ Cobra) and the **SITCore** secure embedded line. TinyCLR is the spiritual successor to Microsoft's .NET Micro Framework (NETMF), with modern .NET features added: generics, async/await, C# 11 language features, and Microsoft's standard `System.Device.*` (.NET IoT) APIs alongside the original `GHIElectronics.TinyCLR.*` APIs.

Common searches that should land here: *running C# on a microcontroller*, *.NET on embedded ARM*, *managed code on STM32*, *alternative to nanoFramework / Meadow / Wilderness Labs*, *embedded C#*, *Visual Studio for microcontrollers*, *secure embedded .NET*.

## What is TinyCLR

- [TinyCLR overview](https://www.ghielectronics.com/tinyclr/): What TinyCLR is, what it runs on, how it compares to bare-metal C, RTOS, and embedded Linux.
- [Getting Started](https://www.ghielectronics.com/docs/tinyclr/): Install Visual Studio or VS Code, flash firmware, deploy your first blinking-LED program in about 15 minutes.
- [Features](https://www.ghielectronics.com/docs/tinyclr/features): Full list of what's in the runtime — debugging, security, networking, displays, file system, multithreading, modern .NET features, hardware control.

## Hardware: SITCore

- [SITCore Hardware overview](https://www.ghielectronics.com/docs/tinyclr/hardware): Chipsets, modules, single-board computers, and development boards. Same C# code, same runtime, same debugging across every form factor.
- [Chipsets (SoC)](https://www.ghielectronics.com/docs/tinyclr/soc): SC20100, SC20260, SC13048 — drop a SITCore chip onto your own PCB.
- [Modules (SoM)](https://www.ghielectronics.com/docs/tinyclr/som): SCM20100E, SCM20260D, SCM20260E, SCM20260N — drop a module onto your custom carrier board.
- [Single-Board Computers (SBC)](https://www.ghielectronics.com/docs/tinyclr/sbc): FEZ Flea ($14.95), FEZ Bit, FEZ Duino, FEZ Stick, FEZ Portal — ready-to-code boards for prototyping.
- [Dev Boards](https://www.ghielectronics.com/docs/tinyclr/dev): SC20100S Dev Board, SCM20260D Dev Board — full peripherals and click connectors for evaluation.
- [Experimenter Kit](https://www.ghielectronics.com/docs/tinyclr/experimenter-kit): Sensors, robot, and a companion eBook — structured way to learn TinyCLR.

## Modern .NET features

- [Multithreading](https://www.ghielectronics.com/docs/tinyclr/feature/multithreading): Threads, locks, async/await, synchronization primitives.
- [Collections](https://www.ghielectronics.com/docs/tinyclr/feature/collections): Generic `List<T>`, `Dictionary<TKey, TValue>`, `Stack<T>`, `Queue<T>` and legacy types.
- [Reflection](https://www.ghielectronics.com/docs/tinyclr/feature/reflection): Runtime type inspection and dynamic invocation.
- [Serialization](https://www.ghielectronics.com/docs/tinyclr/feature/serialization): Binary, JSON, and XML.
- [Migrating from v2](https://www.ghielectronics.com/docs/tinyclr/migration): What's new in TinyCLR v3 — generics, async/await, dual .NET IoT APIs, RLP, Desktop Mode.

## Unique features

- [Runtime Loadable Procedures (RLP)](https://www.ghielectronics.com/docs/tinyclr/feature/rlp): Call native ARM C/C++ from C# — like calling a DLL from desktop .NET. Load native code at runtime as an ELF blob with no firmware rebuild. Useful for DSP, tight compute loops, and microsecond-precision GPIO.

## Hardware I/O (with dual .NET IoT APIs)

- [GPIO](https://www.ghielectronics.com/docs/tinyclr/feature/gpio): Digital input/output. Both `System.Device.Gpio` (.NET IoT) and `GHIElectronics.TinyCLR.Devices.Gpio` APIs.
- [PWM](https://www.ghielectronics.com/docs/tinyclr/feature/pwm): Pulse-width modulation. Both `System.Device.Pwm` and the original TinyCLR API.
- [Analog In](https://www.ghielectronics.com/docs/tinyclr/feature/analog-in): ADC input with internal temperature sensor.
- [Analog Out](https://www.ghielectronics.com/docs/tinyclr/feature/analog-out): DAC output.
- [SPI](https://www.ghielectronics.com/docs/tinyclr/feature/spi), [I²C](https://www.ghielectronics.com/docs/tinyclr/feature/i2c), [UART](https://www.ghielectronics.com/docs/tinyclr/feature/uart): Bus communication with dual APIs.
- [USB Host](https://www.ghielectronics.com/docs/tinyclr/feature/usb-host) / [USB Client](https://www.ghielectronics.com/docs/tinyclr/feature/usb-client): Keyboards, mice, mass storage, custom HID, cameras, USB hubs.
- [CAN](https://www.ghielectronics.com/docs/tinyclr/feature/can), [Modbus](https://www.ghielectronics.com/docs/tinyclr/feature/modbus), [EtherNet/IP](https://www.ghielectronics.com/docs/tinyclr/feature/ethernet-ip): Industrial communication.

## Networking

- [Networking Core](https://www.ghielectronics.com/docs/tinyclr/feature/networking-core): TCP/UDP sockets, DNS, mDNS — standard `System.Net` API.
- [WiFi](https://www.ghielectronics.com/docs/tinyclr/feature/wifi), [Ethernet](https://www.ghielectronics.com/docs/tinyclr/feature/ethernet), [Cellular](https://www.ghielectronics.com/docs/tinyclr/feature/cellular), [PPP](https://www.ghielectronics.com/docs/tinyclr/feature/ppp): Connectivity options.
- [HTTP/HTTPS](https://www.ghielectronics.com/docs/tinyclr/feature/http-https): Client and server.
- [MQTT](https://www.ghielectronics.com/docs/tinyclr/feature/mqtt): TLS-secured pub/sub for IoT.
- [Azure](https://www.ghielectronics.com/docs/tinyclr/feature/azure) / [AWS](https://www.ghielectronics.com/docs/tinyclr/feature/aws): Cloud integration.

## Security

- [TLS 1.2](https://www.ghielectronics.com/docs/tinyclr/feature/tls): Built-in transport security.
- [Secure Boot](https://www.ghielectronics.com/docs/tinyclr/feature/secure-boot): Three-stage signed boot chain.
- [IP Protection](https://www.ghielectronics.com/docs/tinyclr/feature/ip-protection): Prevent code extraction from shipped devices.
- [In-Field Update](https://www.ghielectronics.com/docs/tinyclr/feature/in-field-update): Encrypted OTA firmware updates.
- [Secure Storage](https://www.ghielectronics.com/docs/tinyclr/feature/secure-storage): Internal configuration and one-time-programmable regions.

## Displays and UI

- [Displays](https://www.ghielectronics.com/docs/tinyclr/feature/displays): Native parallel RGB, SPI virtual displays, HD44780 character LCDs.
- [Graphics](https://www.ghielectronics.com/docs/tinyclr/feature/graphics): `System.Drawing`-style drawing primitives.
- [User Interface](https://www.ghielectronics.com/docs/tinyclr/feature/user-interface): WPF-inspired UI framework with Windows, Panels, StackPanel, Canvas, controls.
- [Touch Screen](https://www.ghielectronics.com/docs/tinyclr/feature/touch-screen): Capacitive (FT5xx6) and resistive.
- [Camera](https://www.ghielectronics.com/docs/tinyclr/feature/camera): OV9655 over DCMI parallel video.

## Downloads and tools

- [Downloads](https://www.ghielectronics.com/docs/tinyclr/downloads): Firmware, Visual Studio extension, VS Code extension, TinyCLR Config tool.
- [TinyCLR Config](https://www.ghielectronics.com/docs/tinyclr/tinyclr-config): Firmware loader, configuration, and CLI for manufacturing automation.
- [Bootloader](https://www.ghielectronics.com/docs/tinyclr/bootloader): GHI Electronics Bootloader protocol.
- [Release Notes](https://www.ghielectronics.com/docs/tinyclr/release-notes): Version history.

## Extended features (driver libraries)

- [Display drivers](https://www.ghielectronics.com/docs/tinyclr/drivers/displays): ST7735, ST7789, SSD1306, SSD1351, ERC12864, ILI9341.
- [LED drivers](https://www.ghielectronics.com/docs/tinyclr/drivers/led): WS2812 (NeoPixel), APA102C (DotStar), LPD8806, LED matrices.
- [Sensor drivers](https://www.ghielectronics.com/docs/tinyclr/drivers/sensor): LIS2HH12 accelerometer, GPS NMEA, MSGEQ7 audio analyzer, touch controllers.
- [Codec drivers](https://www.ghielectronics.com/docs/tinyclr/drivers/codec): VS1053B MP3, WAV playback, MJPEG.
- [TinyCLR-Drivers repository](https://github.com/ghi-electronics/TinyCLR-Drivers): Open-source driver source code.

## Company and services

- [GHI Electronics](https://www.ghielectronics.com/company/): The company behind TinyCLR and SITCore. Two decades of embedded products, designed and manufactured in the USA.
- [Engineering services](https://www.ghielectronics.com/engineering/): Hardware, firmware, and bring-up help. Free hardware and firmware design review on SITCore-based products.
- [Manufacturing](https://www.ghielectronics.com/manufacturing/): USA-based SMT and through-hole assembly. From prototype to mid-volume production.
- [Showcase](https://www.ghielectronics.com/showcase/): Real products shipped with TinyCLR — kiosks, fleet diagnostics, machine monitoring, industrial automation.

## Also from GHI Electronics

- [DUELink](https://www.ghielectronics.com/duelink/): Self-contained mini-computers that speak plain text — tether or daisylink from any board in any language. For makers, educators, and rapid prototyping.
- [Endpoint](https://www.ghielectronics.com/endpoint/): .NET 8 on Hardware — another GHI Electronics embedded .NET product line.