Gravity: Analog EMG Sensor by OYMotion
📦 Location of the warehouse: China
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Gravity: Analog EMG Sensor by OYMotion
DFRobot Gravity: Analog EMG Sensor by OYMotion is a high-quality, non-invasive sensor designed to detect sEMG (surface electromyography) signals, reflecting human muscle and neural activity. This sensor is a perfect solution for projects requiring real-time muscle activity monitoring, such as human-computer interactions, robotic control, and biofeedback systems.
The EMG Muscle Sensor Module is designed with a differential input and a built‑in analog filter circuit, capable of amplifying weak muscle signals (±1.5 mV) by 1000 times while effectively reducing noise interference. With an output signal range of 0 to 3.0 V and a 1.5 V reference voltage, it ensures stable and accurate signal acquisition.
Unlike traditional medical electrodes, this muscle sensor module provides high‑quality signal collection without the need for conductive gel, making it more convenient, durable, and user‑friendly. It is ideal for biomedical projects, robotics control, human‑machine interaction, and Arduino‑based muscle signal monitoring.
Features
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Metal dry electrodes for long life and easy usage
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Differential input with high common mode rejection ratio (CMRR)
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Low power consumption with single 3.3V to 5.5V power supply
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Provides accurate readings of muscle strength and activity
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No conductive gel needed, making it more convenient and durable
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Can be easily integrated with Arduino for muscle activity detection and robotic control
Applications
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Human-computer interaction for assistive technology
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Robotic control using muscle signals
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Biofeedback systems for physical therapy
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Interactive projects such as myoelectric mouse and wearable devices
Specifications
Signal Transmitter Board:
| 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°C |
| Size | 22mm x 35mm (0.87 x 1.38 inches) |
Dry Electrode Board:
| Electrode Connector | PJ-342 |
| Wire Length | 50cm (19.69 inches) |
| Plate Size | 22mm x 35mm (0.87 x 1.38 inches) |
| Weight | 36g |
Example Projects
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Head-mounted Myoelectric Mouse
Parts needed: Arduino Leonardo, Gravity: Analog EMG Sensor, IMU shield, and more. -
A Christmas Present for Kids: A Clever Rabbit Hat
Parts needed: Gravity: Analog EMG Sensor, Beetle Arduino, 9g servos, and more.
In the Box
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1 x EMG Dry Electrode Board
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1 x Wrist Belt
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1 x Electrode Cable
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1 x EMG Signal Transmitter Board
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1 x Gravity Analog Cable 3Pin
Related articles
FAQ
The sensor reading is abnormally large or remains unchanged. What should I do?
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Verify that the sensor power supply is stable.
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Ensure the electrode patch direction is aligned with the muscle direction. The patch should be attached to a large area of exposed skin.
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Disconnect and reconnect the sensor electrode connector to check if the reading returns to normal.
👉 You can also refer to this tutorial video for troubleshooting: Quiz Video
Where should I place the dry electrode? Are there any special requirements?
Generally, the three metal dry electrode plates do not require attention to the reference voltage. The key requirement is that they must be aligned with the muscle direction to ensure accurate signal acquisition.
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(For Products in the US Warehouse & Global Warehouse)
2.1 Continental U.S. (50 States)
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| USPS Ground Advantage | $0.00 - $5.00 | $9.99 | 3-7 Business Days |
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2.2 Non-Continental U.S.
(Includes Alaska, Hawaii, Puerto Rico, Guam, Virgin Islands, etc.)
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| USPS Ground Advantage | $0.00 - $5.00 | $9.99 | 5-9 Business Days |
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| USPS Ground Advantage | Over $70.00 | Free | 5-9 Business Days |
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Our products are stored in both our U.S. and Global warehouses to provide more flexible logistics solutions. On each product's description page, we indicate the specific warehouse location.
3.1 U.S. Warehouse
For products stored here, we use USPS for shipping. Logistics within U.S. are very efficient, with an estimated delivery time of 3-7 business days.
3.2 Global Warehouse (China)
Located in Shenzhen, Guangdong.
For orders shipping from our Global Warehouse, we typically use YunExpress. Given the complexities of international shipping, the estimated delivery time is around 10 business days, though this may vary due to customs processes.
4. Customs and Taxes
Effective Date: December 10, 2025
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1. Warranty Policy
A. Standard Limited Warranty (Global & US)
For customers in the United States, Asia, and other non-EU regions:
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Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.
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Coverage: This warranty covers defects in material and workmanship under normal use.
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Resolution: We will repair or replace defective units at no charge.
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If you are a consumer residing in the European Union or the UK purchasing from our global site:
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Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.
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Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.
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Warranty coverage is VOID if the damage is caused by:
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Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.
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Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.
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Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).
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Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.
Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.
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A. Return Window
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Standard: You may request a return within 31 days of receiving your order.
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EU Customers: You have the statutory right to withdraw from the contract within 14 days of receipt without giving a reason.
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To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.
1. Full Refund (100%)
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The item is Brand New, Unopened, and Unused.
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The original packaging is intact and sealed.
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All accessories are present.
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If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (or "Compensation for Loss of Value" for EU customers) from the refund.
Deductions apply if:
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Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.
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Damaged Packaging: Original box is torn, written on, or missing.
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Technical Modification: The device has been powered on, programmed/flashed, or soldered.
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Broken Seals: Anti-static bags or security seals have been opened.
Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.
C. Shipping Costs
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Defective / Wrong Item: OpenELAB covers the return shipping cost.
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Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
