This SDK includes a demo app in Unity and our easy-to-use decoder library, as well as either an eSense Muscle or eSense EEGenius of your choice. These are the same device with different firmware configuration.

• eSense SDK in C# as download by e-mail
• eSense Muscle or eSense EEGenius device with electrode cables + electrodes in case
• Demo application in C# with demo Unity project
• Documentation
• Technical support by e-mail.

The technical details of the eSense Muscle:

• Bluetooth 5.0 Low Energy, downward compatible up to 4.0
• 2-channel EMG biofeedback device
• Built-in Li-Ion battery 1600mAh for up to 12 hours of uninterrupted operation
• 2 bipolar EMG inputs (CH1+, CH1-, CH2+, CH2-), 1 x analog ground
• 2 multifunction buttons for operating the appliance
• 1 RGB LED to display the operating status
• 24 bit ADC and preamplifier for each channel
• Native sampling with 2 kHz per channel.
• 3 bandpass filters (Bessel, 8th order) per channel. -3dB cut-off frequencies: BP1: 20..950Hz, BP2: 20..300Hz, BP3: 100..200Hz
• RMS calculation and moving average over 0.5 seconds. Decimation to 100 RMS samples per second
• 200mV differential measuring range per channel
• 0.024 μV ADC resolution per LSB
• < 1.7 μV RMS noise BP1
• < 1.3 μV RMS noise BP2
• < 0.8 μV RMS noise BP3
• Channel 1 and 2 CMRR at 50Hz and 60Hz: better than -105dB
• Protection against electrostatic discharge (ESD) up to +-15kV according to the “Human Body Model”, IEC 1000-4-2, Air-Gap Discharge
• HF Filter
• Operating mode: Continuous operation
• Measuring accuracy EMG amplifier / ADC
• Gain: ± 5 % basic accuracy, ± 0.2 % after calibration
• Bandpasses lower and upper cut-off frequency: ± 0.1 %
• Sampling frequency: better than ± 0.1 % (resonator)
• Operating range: 5-40 °C, <= 95% relative humidity

The technical details of the eSense EEGenius:

Identical to the eSense Muscle, but differs in the following points:

• 10 frequency band filters from delta…artifact, 25 Hz transmission rate per frequency band and channel
• Raw signal transmission with 2 kHz sampling
• Real-time impedance measurement for both channels, parallel to measurement

Who is this SDK for?

This SDK targets Unity developers building EMG- or EEG-driven applications — game/VR experiences, research setups, and clinical training on Meta Quest and mobile. It provides direct access to the Bluetooth data streams of the eSense Muscle (surface EMG) and eSense EEGenius (simplified EEG). One of the two devices is included (your choice at checkout), so you have a working test setup right away.

What is included

Bluetooth SDK for both sensor devices:

• eSense Muscle — surface EMG over Bluetooth Low Energy
• eSense EEGenius — simplified EEG over Bluetooth Low Energy
• One of the two devices is included with your purchase (choose at checkout)

Free plugins included with every SDK:

• Unity plugin (C#) for game and VR development
• Unreal Engine plugin (Blueprint + C++) including Meta Quest build support

Also included:

• Fully functional demo app with source code
• API reference and quick-start guide
• Lifetime updates of the purchased platform edition
• Unlimited commercial and non-commercial use, no royalties

Technical specification

VR support (Meta Quest, Unreal Engine)

The Unity SDK for Muscle and EEGenius includes a fully working Quest build. Bluetooth pairing, sensor streaming, and the demo scene run on Meta Quest 2 / 3 / 3s / Pro out of the box. The bundled demo Unity project shows the integration into a VR scene.

Quick start (5-line example)

// Unity / C# (Muscle oder EEGenius)
var manager = ESenseBleManager.Instance;
await manager.ScanAndConnect(DeviceKind.Muscle); // oder DeviceKind.EEGenius
manager.OnSample += sample => {
    Debug.Log($"Channel {sample.Channel}: {sample.Microvolts} uV @ {sample.Timestamp}");
};

Use cases

• VR game with muscle control — EMG as input modality on Meta Quest
• Neurofeedback trainer — simplified EEG for attention and relaxation training
• Research setup — Unity stimulus presentation coupled with EMG / EEG recording
• Clinical training — gamified muscle or EEG training for rehab and coaching

Frequently asked questions

Related products

• eSense Complete Set incl. SDK — all sensors plus 1 year web premium access in one bundle
• eSense SDK Mobile (iOS / Android)
• eSense SDK Windows
• eSense SDK macOS