MEROSS MST100 - Smart WiFi Sprinkler Timer

General Overview

The MEROSS MST100 Smart Sprinkler Timer is an intelligent WiFi irrigation controller designed to automate and optimize the watering of your garden, lawn, drip irrigation system, or pool. This device wirelessly connects to the Meross MSH400 hub (sold separately, required for operation) and allows complete management of your watering cycles from the Meross app on your smartphone or tablet, wherever you are.

Unlike traditional controllers, the MST100 includes an intelligent weather skip function that uses hyper-local weather data to automatically skip watering before, during, and after rain, or in freezing or windy conditions. This feature protects your plants, prevents your garden from flooding, and saves water by avoiding unnecessary watering. You receive push notifications when a watering cycle is skipped due to weather conditions.

The MST100 offers extensive compatibility with major home automation platforms and voice assistants: the native Meross app, Apple HomeKit, Amazon Alexa, Google Assistant, and SmartThings. This versatility allows for voice control via Siri, Alexa, or Google Assistant with simple commands. The controller is equipped with robust brass connectors (inlet and outlet) offering corrosion resistance for long-term durability in outdoor conditions.

Key Features

• Customizable Watering Schedules: Create tailor-made watering programs with custom start times, adjustable watering durations from 1 minute to 11 hours 59 minutes, and configurable weekly frequencies (Monday-Sunday). Schedules can be based on specific days, regular intervals (e.g., every 3 days, odd days), or specific times. Once configured, these programs operate autonomously even without an Internet connection.
• Automatic Weather-Based Skip: The MST100 utilizes hyper-local weather data to automatically skip scheduled watering cycles before, during, and after rain, or in freezing or windy conditions. This weather intelligence protects your plants from overwatering, prevents garden flooding, and significantly reduces water waste. The app sends you push notifications to inform you of each skipped cycle due to weather conditions.
• Water Consumption Monitoring and Alerts: Monitor your water usage in real-time via the Meross app to save resources and reduce your bills. The system sends instant notifications in case of watering anomalies due to a water outage or other issues, ensuring your plants always receive the necessary care. The consumption history allows you to optimize your watering cycles.
• Manual Watering with Automatic Shutoff: A physical button on the device allows for immediate manual watering without using the app. The automatic shutoff function (15 minutes by default, adjustable via the app) ensures you never waste water and avoid flooding if you forget to turn it off. This feature is ideal for occasional watering needs.
• Durable Brass Connectors: The MST100 is equipped with corrosion-resistant brass inlet and outlet, ensuring long-lasting performance even when exposed to the elements. Threads are available in US (NH3/4-11.5) and EU/AU (G3/4-14) versions, ensuring compatibility with most standard hoses and outdoor faucets.
• Multi-Platform Compatibility and Voice Control: The controller integrates with the Meross app, Apple HomeKit, Amazon Alexa, Google Assistant, and SmartThings. Control your irrigation system with voice commands using simple phrases like "Alexa, turn on the sprinkler timer," "Hey Siri, open the sprinkler timer," or "Ok Google, open the sprinkler timer." Once the initial setup is complete in the Meross app, you can manage the device directly from the Apple Home app.
• Informative LED Display: The device features a large digital LED screen displaying the current time, scheduled watering times, and the status of the ongoing watering cycle. This visual interface allows for quick configuration checks without needing to open the app.
• Watering Event Visualization: The Meross app displays the complete history of past watering events and scheduled future cycles, allowing you to accurately track your irrigation system activity and adjust your schedules accordingly.
• Versatile Applications: The MST100 adapts to all your outdoor watering needs: lawn sprinklers, drip irrigation systems, pool filling, and general garden watering. Its universal design suits all installation sizes, from small gardens to large properties.
  
  

Detailed Technical Specifications

Connectivity

• Hub Required: Meross Smart Hub MSH400 (sold separately)
• WiFi Hub: 2.4GHz
• Maximum Hub-Timer Distance: 100m (328ft) unobstructed
• Communication: Low-power wireless protocol with the hub

Scheduling and Programming

• Watering Duration: 1 minute to 11 hours 59 minutes
• Frequency: Configurable by day of the week (Monday-Sunday)
• Scheduling Types: Specific days, intervals (e.g., every 3 days, odd days), precise times
• Offline Operation: Schedules run even without an Internet connection once configured
• Automatic Shutoff: 15 minutes by default (adjustable via the app)

Smart Features

• Weather Skip: Automatic based on hyper-local weather data (rain, freeze, wind)
• Notifications: Push alerts for skipped cycles, watering anomalies, low battery
• Consumption Monitoring: Real-time monitoring via the Meross app
• History: Display of past events and future cycles
• Manual Control: Physical button for immediate watering

Platform Compatibility

• Native App: Meross app (iOS 13/iPadOS 13 and later, Android)
• Apple HomeKit: Yes (management via Apple Home app after setup)
• Amazon Alexa: Yes
• Google Assistant: Yes
• SmartThings: Yes
• Voice Control: Via Siri, Alexa, Google Assistant

Physical Characteristics

• Dimensions: 97 × 50 × 167 mm (L × W × H) / 3.9 × 2 × 6.6 inches
• Connector Material: Brass - corrosion-resistant
• Inlet: 1 × MHT (male hose thread)
• Outlet: 1 × FHT (female hose thread)
• US Thread: NH3/4-11.5
• EU/AU Thread: G3/4-14
• Display: Large-format digital LED
• Button: Physical manual control

Power Supply

• Type: Built-in battery
• Battery Indicator: Displayed in the Meross app
• Low Battery Alert: Notification via app

Applications

• Automatic Sprinklers: Lawn, garden
• Drip Irrigation: Efficient irrigation systems
• Pools: Automated filling
• General Watering: All outdoor applications