Simulate it free.
Then build it real.

Pre-flashed ESP32 project kits for Home Assistant. Run the circuit in our free online simulator first — then buy the box with the board, the firmware and the guide already inside.

Open the Free Simulator →
Browse Kits

// the bench — every kit tested here before it ships
// garage smart kit — installed in 10 minutes
// plant pal kit — waters itself, logs to home assistant
// presence kit — true occupancy, even sitting still
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$ esptool write_flash kit-firmware.bin … OK — every board ships pre-flashed

Try it in the browser. Build it on your bench.

Three steps between you and a working smart-home device.

01

Simulate — free

Open the online simulator and run the exact circuit and firmware. No account, no install, no cost.

02

Buy the kit

One box with the pre-flashed board, every sensor and wire, an enclosure, and a printed quick-start.

03

Build & connect

Follow the photo guide. Home Assistant auto-discovers your device over local Wi-Fi. No cloud.

Featured Kits

Pre-flashed. Local-first. Everything in the box.

Best Seller

Garage Smart Kit

ESP32 garage door opener for Home Assistant. Local Wi-Fi, no cloud, 10-minute wiring.

$29.99View Kit →
New

Plant Pal Kit

Self-watering plant monitor with soil sensor and pump. Logs everything to Home Assistant.

$24.99View Kit →
In Development

Presence Sensor Kit

24GHz mmWave true-presence detection — knows you’re in the room even when you sit still.

$34.99Notify Me

The Workbench Is Open

Two free tools that run in your browser, built on open source.

$ sensbench –serve esp32 · qemu

Online ESP32 Simulator

Wire components on a virtual breadboard, flash real firmware, watch the serial monitor — all in the browser. Powered by an open-source emulation engine with a QEMU ESP32 backend.

Launch Simulator →
$ ai-builder –describe llm → circuit

AI Project Builder

Describe what you want in plain English. The AI picks parts from our catalog, draws the circuit, writes the firmware — then compiles it for real before showing you a Verified badge.

Try AI Builder →

We Solder the Hard Parts First

So your evening project actually finishes in one evening.

Pre-flashed Firmware

Every board leaves the bench with tested firmware installed. Plug in, power up, it works.

Simulator-First

Run the project in the browser before you buy. What you simulate is what ships.

Guides With Photos

Every wire, every pin, every click — documented step by step, no guessing.

Local-First, No Cloud

ESPHome + Home Assistant over your own Wi-Fi. Your data never leaves the house.

Start With the Simulator. It’s Free.

Build the circuit in your browser — if you like it, the kit is one click away.

Open the Simulator →

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