EMS Device Control

Technical Details quality EMS Device

Training Program Parameters

Parameter Adjustment During Workout

Channels Breakdown:

1. Arms

2. Chest

3. Abs

4. Shoulders

5. Upper Back

6. Lower Back

7. Glutes

8. Legs

9. All (Global override)

Best Control Chip (MCU)

Top Choice: STM32F103C8T6

• Core: ARM Cortex-M3 @ 72 MHz

• PWM: Multiple timers with advanced PWM (great for EMS)

• I/O: Enough GPIOs for 10 channels

• Interfaces: UART, SPI, I2C, USB FS

• Cost: ~$1.30 in bulk

• Toolchain: STM32CubeIDE, PlatformIO, Arduino-compatible

Alternative: GD32F103VCT6 (You already have)

• Very similar to STM32, but lower cost

• Good for cost-sensitive production

• Fully compatible with STM32 firmware in most cases

• No built-in USB (depends on model version), but some support USB FS

THE PCB Board & Components

Here are images of four PCB boards from existing manufacturers. These are provided for reference only, to illustrate functionality and general requirements—we are looking to develop a new and improved custom design.

We require the complete development package, including:

• PCB design and assembly

• Gerber files

• BOM (Bill of Materials)

• Firmware

• Functional prototype with full documentation

• Support for bulk production, including quarterly and monthly manufacturing planning

Additionally, we expect the engineer to consult us and guide us in selecting the best technical and high-quality components and solutions.
As the customer, we may not have full technical knowledge—we rely on your expertise to explain the purpose of each element and advise us on the most suitable options to achieve the highest performance and reliability.

Optional with BLE SoC:

If you want to simplify further and avoid a separate BLE chip + MCU:

🔴 All-in-One Option: nRF52840

• BLE 5.0 + USB + PWM in one chip

• No need for CH340 or STM32

• Cost: ~$2.50–$3.00

• Downside: More complex to program if you’re used to STM32

Pro Combo Setup

Final Recommendation for 10-channel EMS:

Here’s a textual version of the full schematic layout for a 9-channel EMS device using GD32F103VCT6, nRF52832 BLE, and USB interface:

System Schematic Overview

Core Components:

1.  MCU: GD32F103VCT6

   • Controls all 9 EMS channels via PWM

   • Communicates via UART with BLE module

   • Can be programmed via native USB FS or CH340C

2. BLE Module: nRF52832 (UART interface)

   • Receives commands from mobile app (BLE 5.0)

   • Sends training parameters to GD32 MCU

3. USB: CH340C or Native USB

   • For firmware upload and potential PC communication

   • Connects directly to GD32 USB pins (D+/D−)

4. Power Supply

   • Battery: 3.7V LiPo

   • Regulator: AMS1117-3.3V (drops 3.7V to 3.3V for GD32 & BLE)

Channel Outputs:

Connections Summary:

eBOX EMS Device Design

Minimalistic modern aluminuim black like apple iphone 15 pro elegant Black Titanium!

PCB & Enclosure Dimensions:
The maximum PCB size is 10 cm x 6 cm, with a preference for smaller dimensions such as 10 cm x 5 cm or 10 cm x 4 cm, if technically feasible. The external box will be adapted to match the PCB size and should be designed to be as small, compact, and minimalistic as possible.

Charging Solution Requirements:
We require a USB to USB-C charging solution that does not compromise battery lifespan. Battery health and longevity are a priority. If fast charging negatively impacts the battery, it should be avoided. The focus is on a safe, stable, and battery-friendly charging process.

Project Requirements Overview

This summary outlines all essential components and services required to develop our custom EMS device—from hardware and firmware to app development and production support.

App Development:
We require an app developer to build the companion app for both Android and iOS platforms, as the app will communicate directly with the PCB. If you can handle this part, it would be ideal. If not, we kindly ask for a recommendation of a trusted developer capable of delivering the required solution.

Electrode Suits:
If you are able to manufacture the electrode suits as well, that would be a great advantage. If not, we can source a specialized supplier for this component.

Firmware & Technical Details – Electric Impulse:
We can provide five sample EMS devices from various manufacturers to help analyze the Bluetooth protocol and electric impulse signals using an oscilloscope or any additional tools you may require.
However, before moving forward, we need a quotation for:

• Prototype development

• Testing

• Bulk production of 1,000+ units per month or per quarter, depending on market demand

What We Need – Summary

Below is a complete overview of the components and services required for this project:

1. Custom PCB board design and assembly

2. Mobile App Development – Android & iOS

3. Electrode suits – manufacturing or sourcing

4. Firmware – for intelligent impulse control and Bluetooth communication

5. Gerber files, BOM list, and all manufacturing documentation

6. CE Certification (required) and FDA Certification (optional, for future stages)

We appreciate your expert guidance and look forward to receiving your detailed quotation and project proposal.

Research And More Details