Gravity: Analog EMG Sensor by OYMotion

INTRODUCTION

This EMG sensor is launched by the cooperation of DFRobot and OYMotion, which can detect sEMG to reflect muscle and neural activities of human.

This sensor integrates filtering circuit and amplified circuit. It amplifies minimal sEMG within ±1.5mV 1000 times and depresses noises (especially power frequency interference) by differential input and analog filter circuit. The output signal is analog?which takes 1.5V as the reference voltage. The output voltage range is 0~3.0V. The signal strength depends on the intensity of muscle activities. The output signal waveform indicates the muscle activity and contributes to analyze and research the sEMG. Specifically, we can use Arduino as a controller to detect muscle activities, e.g. check whether the muscle is tense; the muscle strength, etc.

This is an active induction sensor can provide high quality signal collection and it is easy to use. Only simple preparations are needed to apply the module for either static or dynamic areas. Dry electrode is applied to the module and good quality signal are available even without conductive gel. Compared with disposable conductive gel needed by medical electrodes, it is more convenient to use and extend its long-life service. Therefore, it is more suitable for most of users. 

Measurements with an analog EMG sensor are noninvasive, convenient and this can be applied in human-computer interactions. With the development of microcontrollers and integrated electric circuits, EMG circuits and sensors have not been applied to traditional medical muscle detection researches but control systems. 

Connect EMG Sensor with Arduino

Attention:
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.

FEATURES

• Metal Dry Electrode: long life, easy to use
• Differential input, high common mode rejection ratio
• Low power consumption
• Single power supply

SPECIFICATION

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?
• Size: 22mm*35mm (0.87inch*1.38inch)

• Dry Electrode Board

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

SHIPPING LIST

• EMG Dry Electrode Board x1

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