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
 
Product Highlights
No Relay Power Monitoring US Plug Made Made For ESPHome is a local smart plug made for ESPHome and Home Assistant. It is suitable for appliance control, scheduling, and Home Assistant automations.
Ideal For
Appliance control
Power monitoring where supported
Schedules and Home Assistant automations
Compatibility
Designed for local smart home use with Home Assistant. Products marked as Made For ESPHome use the correct Made For ESPHome compatibility wording and are intended for ESPHome-based local control.