feat: add SmartHomeShopIO WaterFlowKit

Author: dwainscheeren

src/docs/devices/SmartHomeShopIO-WaterFlowKit/index.md

@@ -0,0 +1,84 @@
+---
+title: SmartHomeShopIO WaterFlowKit
+date-published: 2026-04-16
+type: sensor
+standard: global
+board: esp32
+project-url: https://github.com/smarthomeshop/waterflowkit
+made-for-esphome: true
+difficulty: 1
+---
+
+![WaterFlowKit](waterflowkit-product-shop.png "WaterFlowKit")
+
+## Description
+
+The **WaterFlowKit** is an ESPHome-based water flow monitor for supported pulse-based flow sensors.
+It measures **real-time flow rate**, **total water consumption**, and **water temperature**, and also includes
+onboard **temperature** and **humidity** sensing with the **HDC1080**.
+
+It is designed for fully local use with **ESPHome** and **Home Assistant**, with onboarding through
+**captive portal**, **Improv BLE**, or **Improv Serial** where supported, and supports **HTTP OTA** firmware updates.
+
+### Features
+
+- Real-time **flow rate** and **total consumption**
+- **Water temperature** monitoring per flow input
+- Built-in **HDC1080** temperature and humidity sensing
+- Support for multiple **YF-series** pulse flow sensors with calibration options
+- **Wi-Fi** and **Ethernet** firmware variants depending on hardware revision
+- **HTTP OTA** firmware update support
+- Fully **local** and **open source**
+
+### Specifications
+
+- MCU:
+  - **V1**: ESP32
+  - **V2**: ESP32-C6
+- Flow inputs:
+  - **V1**: 2
+  - **V2**: 4
+- Connectivity:
+  - **V1**: Wi-Fi
+  - **V2**: Wi-Fi and Ethernet
+- Sensors: **HDC1080** temperature and humidity
+- Firmware: **ESPHome**
+
+## Variants
+
+- **WaterFlowKit V1 WiFi** — ESP32 based hardware with 2 flow inputs
+- **WaterFlowKit V2 WiFi** — ESP32-C6 based hardware with 4 flow inputs
+- **WaterFlowKit V2 Ethernet** — ESP32-C6 based hardware with wired Ethernet support
+
+## Supported Flow Sensors
+
+- **YF-B1 / YF-B7**
+- **YF-B5 / YF-B6**
+- **YF-B10**
+- **YF-DN40-S**
+- **YF-DN50-S**
+
+## Quickstart
+
+1. Connect power and wire the flow sensors.
+2. Flash the desired firmware with the web flasher or ESPHome.
+3. Onboard the device using the fallback hotspot, **Improv BLE**, or **Improv Serial** where supported.
+4. Adopt the device in **Home Assistant** / **ESPHome**.
+5. Select the connected flow sensor type and calibrate if needed.
+
+Please check our [full documentation and Quick Start Guide](https://smarthomeshop.io/quick-start-waterflowkit)
+and the [product page](https://smarthomeshop.io/waterflowkit) for supported flow sensor details.
+
+## Links
+
+- [Shop](https://smarthomeshop.io/waterflowkit)
+- [GitHub](https://github.com/smarthomeshop/waterflowkit)
+- [Firmware](https://smarthomeshop.io/en/firmware)
+- [Quick Start Guide](https://smarthomeshop.io/quick-start-waterflowkit)
+- [Discord](https://smarthomeshop.io/discord)
+
+## Product Images
+
+| Product view                                | In the box                                  |
+| ------------------------------------------- | ------------------------------------------- |
+| ![Product view](waterflowkit-product-shop.png) | ![In the box](waterflowkit-whatsinthebox-shop.png) |