Sonoff TH16A Temperature and Humidity Monitoring WiFi Smart Switch
Sonoff TH16A Temperature and Humidity Monitoring WiFi Smart Switch
Sonoff TH16A Temperature and Humidity Monitoring WiFi Smart Switch
The Sonoff TH16A is a WiFi-enabled smart switch with integrated temperature and humidity sensors, designed to monitor and control electrical appliances based on environmental conditions. HVAC technicians, laboratory managers, greenhouse operators, and industrial automation engineers use this device to maintain precise climate control and automate equipment operation based on real-time sensor data. It solves the critical problem of manual environmental monitoring and reactive equipment control by enabling proactive automation through continuous sensor feedback and remote WiFi connectivity.
Product Overview
The Sonoff TH16A operates on a dual-functionality principle: it functions as both a smart relay switch and an environmental monitoring hub. The device integrates a DHT11 temperature and humidity sensor that continuously measures ambient conditions and transmits data via 2.4GHz WiFi to the eWeLink cloud platform or local network. The 16A relay can be programmed to trigger ON or OFF states based on user-defined temperature and humidity thresholds, enabling autonomous climate control without manual intervention. This intelligent automation reduces energy consumption by preventing equipment from running unnecessarily and ensures optimal conditions for temperature-sensitive processes.
What distinguishes the TH16A is its combination of high-current switching capacity (16A at 250V AC) with environmental sensing, making it suitable for controlling larger appliances like air conditioners, dehumidifiers, heaters, and industrial fans. The device supports both local control via the eWeLink mobile application and cloud-based automation through IFTTT integration, voice assistant compatibility with Alexa and Google Home, and advanced scheduling features. The compact DIN-rail mountable design allows installation in control panels, while the external sensor port enables remote temperature and humidity measurement up to 2 meters away from the main unit.
Key Specifications
| Specification | Details |
| Product Type | WiFi Smart Switch with Temperature and Humidity Sensor |
| Brand | Sonoff |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Relay Rating | 16A at 250V AC, 3680W maximum load |
| Temperature Sensor Range | -10°C to 40°C with ±2°C accuracy |
| Humidity Sensor Range | 20% to 90% RH with ±5% accuracy |
| WiFi Standard | IEEE 802.11 b/g/n, 2.4GHz frequency |
| Power Supply | AC 100-240V, 50/60Hz |
| External Sensor Cable | 2-meter extension available for remote monitoring |
Key Features
- Dual-Channel Automation: Simultaneously control relay switching and monitor environmental parameters with independent threshold settings for temperature and humidity conditions
- 16A High-Current Relay: Capable of switching loads up to 3680W at 250V AC, suitable for air conditioners, water heaters, and industrial equipment
- Integrated DHT11 Sensor: Measures temperature from -10°C to 40°C and humidity from 20% to 90% RH with 2-second update intervals
- Remote Sensor Extension: External sensor port supports 2-meter cable extension for measuring conditions away from the main device installation point
- Multi-Platform Control: eWeLink mobile app, web dashboard, IFTTT automation, Amazon Alexa, and Google Home voice assistant compatibility
- Local and Cloud Operation: Functions offline with local network control or connects to Sonoff cloud servers for remote access from anywhere globally
- Customizable Logic Rules: Create complex automation scenarios with AND/OR conditions combining temperature, humidity, time schedules, and manual triggers
- Real-Time Data Logging: Historical sensor data storage and visualization for trend analysis and optimization of environmental control strategies
Applications and Use Cases
- HVAC System Control: Automatically activate air conditioning units when room temperature exceeds 28°C and dehumidifiers when humidity rises above 60%, reducing energy consumption in commercial buildings and data centers
- Greenhouse Climate Management: Monitor and control heating, cooling, and misting systems based on precise temperature and humidity thresholds to optimize plant growth conditions in agricultural operations
- Laboratory and Pharmaceutical Storage: Maintain strict environmental conditions for temperature-sensitive materials by automatically triggering cooling systems when storage temperatures deviate from 18-22°C specifications
- Industrial Process Automation: Control equipment operation in manufacturing facilities where humidity affects product quality, such as electronics assembly, textile production, and food processing
- Server Room Environmental Monitoring: Trigger emergency cooling or alert systems when data center temperatures approach critical thresholds, preventing hardware damage and downtime
- Wine Cellar and Museum Climate Control: Maintain optimal temperature 12-14°C and humidity 50-80% conditions for preservation of valuable collections through automated HVAC management
How to Use
Begin installation by turning off power at the circuit breaker, then connect the Sonoff TH16A according to the wiring diagram: L (Live) to the incoming power phase, N (Neutral) to the neutral line, and connect your load (appliance) between the relay output terminals. Mount the device on a DIN rail or wall surface, restore power, and press the reset button for 5 seconds until the LED flashes rapidly, indicating WiFi pairing mode. Download the eWeLink application on your smartphone, create an account, scan the QR code on the device, select your 2.4GHz WiFi network, and complete the pairing process.
Once connected, navigate to the device settings in eWeLink to configure automation rules. Set temperature thresholds by selecting Automation > Add Rule > Temperature Condition, specify whether you want the relay to activate when temperature rises above or falls below your target value, and set the hysteresis band (typically 1-2°C) to prevent relay chatter. Similarly, configure humidity conditions, combine multiple conditions using AND/OR logic, set time schedules for when rules are active, and enable notifications to receive alerts when thresholds are triggered. Test your configuration by manually adjusting room temperature or humidity and verifying that the relay switches at the programmed thresholds. For advanced users, integrate with IFTTT to trigger external actions or use the local API for custom home automation systems.
Frequently Asked Questions
Can the Sonoff TH16A work without internet connection?
Yes, the TH16A supports local network operation when connected to your home or office WiFi. You can control it through the eWeLink app on your local network without cloud connectivity. However, remote access from outside your network requires internet connection to the Sonoff cloud servers. For maximum reliability, configure automation rules that execute locally on the device, ensuring they continue functioning even if internet connection is temporarily lost.
What is the maximum cable length for the external temperature and humidity sensor?
The standard external sensor cable provided is 2 meters long, which allows you to place the sensor in a different room or location away from the main switch unit. The DHT11 sensor requires a direct connection to the TH16A via the dedicated sensor port. For distances beyond 2 meters, you would need to purchase an extended cable separately, though signal quality may degrade significantly beyond 3-4 meters due to electromagnetic interference.
How accurate are the temperature and humidity readings?
The integrated DHT11 sensor provides temperature accuracy of ±2°C across its -10°C to 40°C range and humidity accuracy of ±5% RH across its 20% to 90% range. These specifications are suitable for general climate control applications but may not meet requirements for precision laboratory or pharmaceutical applications that demand ±0.5°C accuracy. The sensor updates readings every 2 seconds, and the eWeLink app displays real-time values with 1-second refresh intervals. For critical applications requiring higher accuracy, consider using external high-precision sensors with analog output connected through additional hardware.
Can I use the Sonoff TH16A to control multiple appliances simultaneously?
The TH16A has a single relay output, so it can directly control only one appliance at a time. However, you can use the relay to control a multi-outlet power strip or contactor to switch multiple devices simultaneously. Alternatively, purchase multiple TH16A units and configure them with synchronized automation rules to control different appliances based on the same temperature and humidity conditions. The eWeLink app allows you to group multiple devices and create scenes that trigger all of them together.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Returns: 7-day return policy on manufacturing defects only
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