US Smart Power Monitor (No Relay Version)
 
Designed for Always-On Devices · ESPHome · ESP8285 + HLW8032
 
This smart plug is specially designed for devices that must stay online — such as NAS, servers, routers, network hardware, mini PCs, and smart home hubs.
Unlike standard smart plugs, this model features no relay, ensuring 100% uninterrupted power, with zero risk of accidental shutdown.
It provides accurate real-time energy monitoring, powered by the HLW8032 metering chip and ESP8285 Wi-Fi MCU. Pre-flashed with ESPHome, it integrates seamlessly with Home Assistant and automation platforms for power analysis and device state detection.
 
🔍 Ideal For Always-On Devices
✔ NAS / Home Server
✔ Router & Switch
✔ Network Storage & Gateway Devices
✔ Smart Home Hub / Raspberry Pi
✔ Mini PC / Thin Client
✔ Industrial or Network Monitoring Equipment
No relay = no switching = zero risk of power interruption.
Perfect for 24/7 operation and long-term monitoring.
 
🚀 Key Features
🛑 No Relay – Guaranteed continuous power
🔍 Designed for servers & network devices
⚡ HLW8032 energy metering for high accuracy
📶 ESP8285 Wi-Fi microcontroller
🧠 ESPHome pre-flashed – instantly works with Home Assistant
📈 Detect device status via power usage (automation-friendly)
🔄 OTA firmware upgrade support
☁ Fully local control – no cloud needed
 
📦 Specifications
Parameter
Description
MCU
ESP8285（2MB） Wi-Fi
Energy IC
HLW8032
Relay
None – guaranteed no interruptions
Firmware
ESPHome pre-installed
Voltage
100～240V AC
Plug Type
US
Protocols
ESPHome API / MQTT
Current
16A
Supports OTA
Yes
 
🧠 Automation Possibilities
Detect if NAS / server is running or offline via power usage
Track long-term power consumption trends
Send alerts if router draws no power (failure detection)
Measure idle vs active power of network equipment
Home Assistant energy dashboards
Power efficiency optimization
 
🧾 Why This Plug?
Specifically built for devices that must not lose power
No relay — no risk of accidental shutdown
ESPHome-ready for instant smart home integration
Accurate energy monitoring with HLW8032
Ideal for IT labs, data monitoring, and smart home setups
Perfect for 24/7 non-stop operation
The measurement error of active power about 0.2%
The measurement error of effective current is 0.5%
The measurement error of effective voltage is 0.5%
 
Yaml File Download: 
https://github.com/athom-tech/athom-configs/blob/main/athom-without-relay-plug.yaml
 
GPIOs:
 
GPIO3： CSE7766 Rx
GPIO5： Button1
GPIO13 ：LedLinki
 
Steps to Install :
 
*Power on the plug
*Use your phone/computer search the SSID: a t ho m_xxxxxxx
*Connect it and set the SSID and password of your 2.4G WiFI 
*Go your Home Assitant find the new device and complete installation