Add SENSY-ONE S1 Pro Multi Sense device

src/docs/devices/sensy-one-s1-pro/index.md

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+---
+title: SENSY-ONE S1 Pro Multi Sense
+date-published: 2026-02-17
+type: sensor
+standard: global
+board: esp32
+project-url: https://github.com/sensy-one/S1-Pro-Multi-Sense
+made-for-esphome: true
+difficulty: 1
+---
+
+![SENSY-ONE S1 Pro Multi Sense](S1_Pro_Multi_Sense.jpg)
+
+## Description
+
+The SENSY-ONE S1 Pro Multi Sense is a compact Wi-Fi mmWave presence and environmental multisensor designed for ESPHome and Home Assistant. It delivers real-time multi-target tracking, indoor air quality sensing, and seamless smart home automation support.
+
+## Links
+
+- [Official Product Page](https://sensy-one.com/products/s1-pro-multi-sense-1)
+- [Home Assistant Add-on](https://github.com/sensy-one/home-assistant-addons)
+- [S1 Pro vs E1 Pro Comparison Blog](https://sensy-one.com/blogs/blog/s1-pro-vs-e1-pro-multi-sense-which-smart-sensor-is-right-for-you)
+
+## Features
+
+- Hi-Link LD2450 24GHz mmWave radar module (tracks up to 3 targets simultaneously)
+- ESP32-C3 microcontroller with 2.4GHz Wi-Fi and Bluetooth Low Energy
+- USB-C 5V power input
+- Bosch BME688 environmental sensor (VOC, eCO₂ estimation, IAQ, temperature, humidity, air pressure)
+- LTR-390UV ambient light and UV sensor
+- Optional Sensirion SCD40 NDIR CO₂ sensor (true CO₂ measurement with temperature & humidity)
+- Configurable detection zones (3 zones + 1 exclusion zone)
+- Real-time X/Y position, distance and motion tracking
+- RGB LED status indicator
+- Integrated piezo buzzer (~80–90 dB)
+- Home Assistant custom add-on with 2D & 3D floorplan support, live presence visualization, and heatmaps