MyoWare Muscle Sensor

The MyoWare Muscle Sensor from Advancer Technologies measures, filters, rectifies, and amplifies the electrical activity of a muscle and produces an analogue output signal that can easily be read by a microcontroller, enabling novel, muscle-controlled interfaces for your projects.

AUD $78.95

Order As Required  

Back orders: Ship 129 units in 7 days

Our Code: SKU-003386

Supplier: [Pololu MPN:2732]


Description

Note: This product does not include electrodes; they are available separately in packs of six. To use the sensor, an electrode must be connected to each of the sensor’s three snap connectors (two on the PCB and the third at the end of the black reference electrode cable).

MyoWare Muscle Sensor, bottom view

Overview

This muscle sensor from Advancer Technologies measures a muscle’s activity by monitoring the electric potential generated by muscle cells. This is referred to as electromyography (EMG). The sensor amplifies and processes the complex electrical activity of a muscle and converts it into a simple analogue signal that can easily be read by any microcontroller with an analogue-to-digital converter (ADC), such as an A-Star or Arduino – or even a Maestro servo controller like we show in this blog post. As the target muscle group flexes, the sensor’s output voltage increases. The exact relationship between the output voltage and the muscle activity can be fine-tuned using an on-board gain potentiometer.

The MyoWare Muscle Sensor is an updated version of Advancer Technologies’ older Muscle Sensor v3 with a number of improvements, notably single-supply operation (no need for a negative voltage supply) and built-in snap connectors for electrodes. Other new features include a raw EMG output, reverse power protection, a power switch, and LED indicators.

In order to attach to skin, the sensor requires three electrodes (not included) that snap into the sensor’s snap-style connectors, which make it easy to attach and detach electrodes. Two connectors are located directly on the PCB, and the third is located at the end of the attached reference electrode cable. The board’s pins have a 0.1″ pitch and work with 0.1″ male headers and 0.1″ female headers.

Pololu - Electrodes for the MyoWare Muscle Sensor

MyoWare Muscle Sensor with electrodes attached, top view. (Electrodes not included.)

For more detailed information about the muscle sensor, including instructions on how to use it, see the Advancer Technologies MyoWare Muscle Sensor datasheet (1MB pdf). Example Arduino programs can be found on the MyoWare GitHub page.

Features

Example of electrode placement for the MyoWare Muscle Sensor to measure bicep activity

  • Dimensions: 2.1″ × 0.8″ (excluding reference electrode cable, which is about  3″ long)
  • Operating voltage: 2.9 V to 5.7 V (unlike previous sensor versions, no negative supply is required)
  • Analogue voltage output from 0 V to +Vs (supply voltage)
  • Adjustable gain
  • Both EMG envelope and raw EMG outputs available
  • Embedded electrode connectors – electrodes snap directly into MyoWare (alternatively, external electrode cables can be connected)
  • LED Indicators – one power LED, and one LED that brightens when the muscle is flexed
  • Power switch
  • Reverse voltage protection
  • Two mounting holes (suitable for M3 or #4 screws)
  • Informative user’s guide (1MB pdf)

The preferred way to power the MyoWare sensor is from the same logic voltage as the rest of your system (for example, 5 V when used with a 5 V microcontroller). If you power the sensor from a battery or another supply with a higher voltage, the output can be as high as the supply voltage (Vs), and we recommend that you take precautions (such as adjusting the gain) to make sure that the signal does not exceed what the rest of the system can handle.


Specifications

Dimensions

Size: 2.1″ × 0.8″1
Weight: 7.5 g2

General specifications

Minimum operating voltage: 2.9 V
Maximum operating voltage: 5.7 V
Reverse voltage protection?: Y
Supply current: 9 mA3

Notes:

1
Sensor PCB size. This measurement excludes the reference electrode cable, which is about 3″ long.
2
Without electrodes.
3
Typical.

Resources

File downloads

MyoWare Muscle Sensor datasheet (1MB pdf)
Datasheet for the Advancer Technologies MyoWare Muscle Sensor.

Recommended links

Advancer Technologies MyoWare Muscle Sensor GitHub repository
This GitHub repository for the MyoWare muscle sensor has documentation, like the schematic and user’s guides, along with example Arduino code.
Muscle Sensor tutorials from Advancer Technologies
This page contains tutorials that demonstrate how to use Advancer Technologies’ muscle sensors, including projects like bionic Iron Man armour, a USB biofeedback game controller, and EMG audio biofeedback.

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