Control Smart Devices via MQTT with IAMMETER + Tasmota: Get Free Smart Plugs Now!
Smart Plugs Now Available in the IAMMETER Gift Store
Tasmota smart plugs compatible with IAMMETER are now available in our Gift Store! You can get one for free with just 2500 reward points.
Quantities are limited, so act fast! Various international plug types are available:
| No. | Plug Type | Model | Quantity | Image |
|---|---|---|---|---|
| 1 | EU | WSM-16P-EU | 11 |  |
| 2 | FR | WSM-16P-FR | 14 |  |
| 3 | UK | WSM-16P-UK | 13 |  |
| 4 | US | WSM-16P-US | 15 |  |
| 5 | AU | WSM-16P-AU | 13 |  |
| 6 | CN | WSM-16P-CN | 11 |  |
Use IAMMETER Cloud + Tasmota to Enable Smart Load Control via MQTT
This guide explains how to use IAMMETER Cloud in combination with a Sonoff smart switch (flashed with Tasmota firmware) to enable automated device control via MQTT, based on real-time power data. It’s a streamlined solution for building efficient energy automation at home.
👉 View Tutorial: Trigger the SonOff (Tasmota firmware) from IAMMETER
⚠️ Important Usage Notes
Sonoff switches are suitable for low-power appliances (max current ≤10A), such as fans, small pumps, and plug-in loads. Do not use for high-current devices.
🛠️ Overview of Implementation Steps
- Enable MQTT in IAMMETER Cloud
- Add your meter to IAMMETER-Cloud and enable MQTT.
- Obtain your MQTT Client ID and set up automation rules (e.g., send control commands based on power thresholds).
- Configure the Tasmota-Flashed Sonoff Device
- Set MQTT broker to:
mqtt.iammeter.com:1883 - Define the control topic (e.g.,
cmnd/POWER) and payload (1to turn on,0to turn off).
- Set MQTT broker to:
- Define the Automation Logic
- For example, automatically turn on a fan when power consumption exceeds 100W.
🔧 Suggested Hardware: WEM3050T as Power Trigger Source (Optional)
To enhance precision in energy-based automation, we recommend using IAMMETER's WEM3050T 3-phase energy meter, which is ideal for monitoring detailed power metrics (real-time voltage, current, power). It’s priced at just USD 109, and supports free access to IAMMETER-Cloud Basic.
With WEM3050T, you can:
- Monitor PV generation and grid power in real time
- Accurately trigger device control using MQTT
- Build a robust energy optimization system
👉 Advanced Tutorial: Control Devices Based on Power Reading
🔄 Recommended Solution for High-Power Devices (e.g. Water Heaters)
For controlling high-power devices like electric water heaters, we recommend the IAMMETER WPC3700 Wi-Fi Power Controller, which supports linear power regulation.
With WPC3700, you can:
- Increase solar self-consumption
- Reduce excess feed-in to the grid
- Lower your electricity bill significantly
Unlike standard on/off switches, the WPC3700 adjusts power intelligently and efficiently.
👉 Learn More: Control Your Heater with Solar Surplus
✅ Why Choose IAMMETER?
- Professional-grade energy monitoring hardware
- Cloud platform with MQTT, Webhook, and automation support
- Seamless integration with Tasmota, Home Assistant, Node-RED, etc.
- Combine Sonoff (on/off control) and WPC (power control) to achieve comprehensive load management and maximize solar utilization.
