Alif StartKits Put an Ethos-U55 NPU on a $50 Board

Two Edge AI Dev Boards at the Low End of Alif's Range

Alif Semiconductor has released StartKits for two of its smaller microcontrollers: the Ensemble E1C (SK-E1C) and the Balletto B1 (SK-B1). Both pair an Arm Cortex-M55 CPU with an Ethos-U55 neural processing unit, and both land at about $50 — Mouser lists each at $49.99, with DigiKey pricing the SK-B1 at $51.28. CNX Software detailed the boards on September 15, 2026. The two are physically near-identical; the difference is that the Balletto B1 adds a wireless subsystem and the Ensemble E1C does not.

• Price: around $49.99 each, with Mouser expecting its next batch on October 22, 2026
• Compute: 160MHz Cortex-M55 with Helium vector extensions plus an Ethos-U55 NPU rated at 128 MACs per cycle
• Memory: 2MB SRAM and 1.8MB NVM, with 1.9MB MRAM on the E1C
• Sensors: a 20-pin Arducam camera header and two PDM microphones on both boards

What Do You Get for $50?

The spec sheet is aimed squarely at the always-on sensing workloads that edge AI silicon exists for. The Cortex-M55 handles control and DSP work through its Helium vector extensions, while the Ethos-U55 takes the quantized neural network layers — keyword spotting, person detection, anomaly detection on vibration or audio. Two PDM microphones and a camera header come soldered on, so a wake-word or vision demo needs no extra hardware.

Expansion is handled by a mikroBUS Click socket plus GPIO headers exposing SPI, I2C, UART, PWM and general I/O. There are two USB Type-C ports — one connected to the SoC, one for programming and debug — and an on-board Segger J-Link debugger built around an Alif E-Series BGA194 part, which is a genuinely nice inclusion at this price. Board dimensions are 86.37 x 71.09 mm.

One detail worth calling out for anyone doing battery-powered design: the PCB has current-measurement jumpers on VDD_MAIN and VDDIO_1V8, and cuttable trace shunts that let you insert an ammeter across individual power domains. Measuring what an NPU inference actually costs in microamps is usually an exercise in soldering; here it is a design feature.

What Is Different About the Balletto B1?

Wireless. The SK-B1 carries a BLE 5.3 and 802.15.4 radio subsystem with the full RF path routed to a chip antenna, which makes it the board to pick for Bluetooth LE sensor nodes, Thread or Matter experiments. The SK-E1C has no radio at all.

The toolchains diverge accordingly. For the E1C, Alif recommends Visual Studio Code with the Ensemble CMSIS Device Family Pack, and supplies a VS Code template on GitHub that plugs into Segger's J-Link GDB server. For the B1, BLE work runs on Zephyr RTOS through the Alif Zephyr SDK, with a companion mobile app that connects to the factory BLE demo. Because the B1 shares the E1C's digital MCU architecture, the same CMSIS and bare-metal flow works for anything that does not need the radio.

One setup note that will save someone an afternoon: before you write any code, connect through the programming USB port and run Alif's Security Toolkit, version 1.112.00 or later, to program the on-chip MRAM and select the target device. The tools default to the larger Ensemble E8, so SK-E1C and SK-B1 users have to explicitly pick E1C or B1.

Where These Sit in the Edge AI Board Market

Alif's higher-end Ensemble E4, E6 and E8 parts use the bigger Ethos-U85 NPU and are pitched at small language models running locally. The E1C and B1 are the opposite end of that ladder — packages as small as 3.9 x 3.9 mm, dedicated neural acceleration, and a price that makes a classroom set or a fleet of prototype sensor nodes affordable.

That puts them in a crowded and increasingly good-value corner of the market. The NeoEyes NE302 vision camera attacks the same problem with an STM32N6, and Amlogic's A123X comes at it from the Cortex-A320 side. Stock is currently unavailable at the major distributors, so the October restock is the realistic entry point. More single board computer and MCU coverage is in our mini computers section.

Sources: CNX Software — September 15, 2026.