Overview

BMH05104-2 is a compact four-electrode body composition analysis module for portable fat scales, four-electrode body composition analyzers and smart health devices. At just 26×35mm it balances accuracy in a tight footprint, reaching 0.94 correlation against the clinical gold standard DEXA. With 3–300kg weighing and 5–800Ω impedance, the built-in TwoLegs140/TwoArms140 algorithm outputs body composition directly, and iOS/Android/Web APIs plus support for your own algorithm keep integration effort low for fast mass production.

Related reading: BIA Measurement Principles and Four/Eight-Electrode Selection | Body Composition Module Quick Selection Guide

Features

  • Four-electrode AC measurement; 3–300kg weighing, 5–800Ω impedance
  • Only 26×35mm, compact and easy to integrate, ideal for portable and cost-sensitive designs
  • Built-in TwoLegs140/TwoArms140 algorithm, direct body composition output, also supports your own algorithm
  • 0.94 correlation against the clinical gold standard DEXA
  • UART (TTL 3.3V) + iOS/Android/Web API, IAP upgrade
  • Low power: 14.5mA typical, 1.5μA sleep

Technical Specifications

Specification Table

Electrode Configuration
Four-electrode AC (single-frequency)
Body Composition Accuracy
0.94 correlation vs DEXA correlation
Interface
UART (TTL 3.3V), IAP
Weight Range
3–300 kg
Weighing Accuracy
10 (3–20kg) / 50 (20–300kg) g
Impedance Range
5–800 Ω
Impedance Accuracy
±1Ω (5–100Ω) / 1% (100–800Ω)
Built-in Algorithm
TwoLegs140 / TwoArms140
Operating Voltage
3.3–5.5 (typ 5V) V
Operating Current
14.5 typ @5V mA
Sleep Current
1.5 μA
Operating Temperature
-10–60 ℃
Storage Temperature
-25–85 ℃
Dimensions
26×35 mm

Application Areas

Portable fat scales, four-electrode body composition analyzers, smart health devices, fitness body-measurement devices

Documents

BMH05104-2 4-Electrode Body Composition Module Datasheet

BMH05104-2 Module Resources

Resources

BMH05104-2 Module Resources

Quick Start

BMH05104-2 4-Electrode Body Composition Module — User Guide

Product: BMH05104-2 — 4-Electrode Body Composition Module Version date: 2026-05-22

BMH05104-2 is BestHealth Electronics' 4-electrode body composition measurement module, integrating bioimpedance (BIA), weight, and heart-rate measurements. The module interfaces with a host MCU or PC over UART using a command protocol, and serves as the core measurement subsystem inside body-fat scales and health-measurement terminals. The module is command- and pin-compatible with its predecessor BMH05102, enabling smooth upgrades for existing customer products.

1. Directory Layout
BMH05104-2/
├── 1.doc/                    # Documents and reference materials
└── 2.board/                  # Module outline / footprint
2. 1.doc — Documents and Reference Materials

Customer-facing reference material shipped with the module.

FileDescription
BMH05104-2(四电级体成分模块)_datasheet.pdfRequired reading — module datasheet: pinout, electrical parameters, UART commands, typical application
BMH05104-2.exeCompanion PC host tool (command testing, module bring-up)

Recommended reading order: review the "Pinout" and "Electrical Characteristics" sections of the datasheet before hardware design. Compatibility notes for customers migrating from BMH05102 are included in the datasheet's compatibility chapter.

3. 2.board — Module Outline / Footprint

Mechanical reference so customers can reserve the correct footprint and outline on their carrier board.

FileDescription
DXF_BMH05104-2_AutoCAD2007.dxfModule outline DXF (AutoCAD 2007 format) for footprint and outline alignment on the customer's mainboard
4. Quick-Start Guide
  1. Read the datasheet1.doc/BMH05104-2(四电级体成分模块)_datasheet.pdf
  2. Reserve outline / footprint — see 2.board/DXF_BMH05104-2_AutoCAD2007.dxf
  3. UART wiring — wire per the datasheet "Pinout" section (default UART 8N1)
  4. Command bring-up — use 1.doc/BMH05104-2.exe to send test commands
5. Version & Contact
6. Disclaimer

The materials in this repository — including hardware schematics, PCB files, source code, and documents — are provided solely for customer reference and evaluation. Before using these materials in product design, mass production, or commercial deployment, customers are responsible for conducting full functional testing, reliability validation, and regulatory certification. BestHealth Electronics Inc. (悠健电子(东莞)有限公司) shall not be liable for any direct or indirect losses arising from the customer's use of these materials in production, sale, or operation — including but not limited to yield issues, field failures, product recalls, or end-customer claims. These materials are provided "as is" without warranty of any kind, express or implied.

7. Intellectual Property

All materials in this repository (including but not limited to hardware design files, source code, documents, trademarks, and logos) are the intellectual property of BestHealth Electronics Inc. (悠健电子(东莞)有限公司), protected by applicable laws. Customers are granted only the right to use these materials for reference and evaluation. Reverse engineering, resale, redistribution, or unauthorized public release is prohibited without prior written consent.

© 2026 BestHealth Electronics Inc. (悠健电子(东莞)有限公司) All Rights Reserved.

This README is a directory-level guide for customer-facing handoff. Refer to the datasheet for exact command and register specifications.

Complete Package

BMH05104-2 Complete Resource Package

BMH05104-2 Module Outline DXF

BMH05104-2 PC Host Tool

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