DFRobot - Gravity: Analog EMG Sensor by OYMotion

This Gravity analog EMG sensor by DFRobot and OYMotion turns surface muscle activity into an input for interactive projects. Reusable metal dry electrodes collect surface electromyography signals without conductive gel, while integrated amplification and filtering prepare the small signals for reading by Arduino or another suitable analog-input controller. The 0~3.0V output supports muscle-activity waveform experiments and software-based interaction, from contraction-triggered robot commands to wearable effects. The kit includes the electrode board, wrist belt, electrode cable and signal transmitter, providing the core sensing hardware for a muscle-controlled prototype. This EMG sensor is intended for non-medical projects.

Reusable Dry Electrodes Without Conductive Gel

This EMG sensor uses metal dry electrodes to collect surface muscle signals without applying conductive gel. Compared with disposable gel-based electrodes, the reusable electrode board offers a convenient arrangement for repeated maker experiments and wearable prototypes. The included wrist belt helps position the board during use, and the electrode cable links the sensing board to the transmitter. Align the electrode with the muscle direction and maintain good contact with exposed skin for effective signal collection.

1000x Amplification with Integrated Noise Filtering

This analog EMG sensor amplifies small sEMG signals within ±1.5mV by 1000 times. Differential input and analog filtering reduce noise, including power-frequency interference, to make muscle-activity signals more accessible to a controller. The output spans 0~3.0V around a 1.5V reference, carrying waveform information rather than a simple on/off result. This signal-conditioning stage provides a practical starting point for exploring muscle contraction patterns and developing application-specific processing for interactive control.

Gravity Analog Interface for Muscle-Controlled Prototypes

This EMG kit combines a PH2.0-3P analog interface with a 3.3~5.5V supply range for integration into controller-based projects. The supplied Gravity analog cable connects the signal transmitter to a suitable analog input, while the separate electrode board allows flexible placement on the muscle being observed. Arduino examples support waveform viewing and fist-count experiments. Software can then translate changes in muscle activity into project actions, such as triggering a servo-driven wearable effect or a robot command.

1. The supply voltage range is 3.3~5.5V; The supply current should not be less than 20mA; The ripple current and disturbance current should be as low as possible. Stabilized DC voltage is recommended.

2. The effective spectrum range is 20Hz～500Hz, and the ADC converter which has higher than 8-bit resolution and 1 kHz frequency are recommended to take samples and digitized to keep original information.

3. Placing the metal dry electrode should consistent with the direction of muscle.

4. The product is not a professional medical device and cannot diagnose and cure disease as an assistant device.

• Reusable metal dry electrodes; no conductive gel required
• 1000x amplification of small sEMG signals within ±1.5mV
• Differential input with high common-mode rejection and analog filtering
• 0~3.0V analog output with a 1.5V reference
• Low power consumption and single power supply
• Gravity analog interface for controller-based muscle-activity projects

• Muscle-activity waveform experiments
• Myoelectric computer-input prototypes
• Muscle-controlled robot interfaces
• Servo-driven wearable effects and interactive accessories

• Supply Voltage: +3.3V～5.5V
• Operating Voltage: +3.0V
• Detection Range: +/-1.5mV
• Electrode Connector: PJ-342
• Module Connector: PH2.0-3P
• Output Voltage: 0～3.0V
• Operating Temperature: 0～50℃
• Size: 22mm*35mm (0.87inch*1.38inch)

• Electrode Connector: PJ-342
• Wire Length: 50cm(19.69inch)
• Plate Size: 22 * 35 mm (0.87*1.38inches)
• weight: 36g

• EMG Dry Electrode Board x1
• Wrist Belt x1
• Electrode Cable x1
• EMG Signal Transmitter Board x1
• Gravity Analog Cable 3Pin x1