© 2015
3-lead Muscle / Electromyography
Sensor for Microcontroller Applications
MyoWare™ Muscle Sensor (AT-04-001)
FEATURES
NEW
- Wearable Design
NEW
- Single Supply
+2.9V to +5.7V
Polarity reversal protection
NEW
- Two Output Modes
EMG Envelope
Raw EMG
NEW
- Expandable via Shields
NEW
- LED Indicators
Specially Designed For Microcontrollers
Adjustable Gain
APPLICATIONS
Video games
Robotics
Medical Devices
Wearable/Mobile Electronics
Prosthetics/Orthotics
DATASHEET
What is electromyography?
Measuring muscle activation via electric potential, referred to as electromyography (EMG), has
traditionally been used for medical research and diagnosis of neuromuscular disorders. However,
with the advent of ever shrinking yet more powerful microcontrollers and integrated circuits, EMG
circuits and sensors have found their way into prosthetics, robotics and other control systems.
Sensor Layout
Raw EMG Signal - 7
Shield Power (output) - 8
GND - 9
Adjustable Gain
End Muscle Electrode Snap
Mid Muscle Electrode Snap
Power Switch
1 - Power Supply, +Vs
2 - Power Supply, GND
3 - Output Signal, SIG
Reference Electrode Cable
EMAIL: support@advancer.co
4 - Mid Muscle Electrode Pin
5 - End Muscle Electrode Pin
6 - Reference Electrode Pin
www.AdvancerTechnologies.com
© 2015
Setup Configurations
(Arduino is shown but MyoWare is compatible with most development boards)
a) Battery powered with isolation via no direct external connections
Note: Since no component is
connected to electrical grid,
further isolation is not
required. It is also
acceptable to power the
MCU with a battery via the
USB or barrel ports.
b) Battery powered sensor, Grid powered MCU with output isolation
(Note: Arduino and batteries not included. Arduino setup is only
an example; sensor will work with numerous other devices.)
RECOMMENDED
Note: Isolation amplifier and
battery provide isolation
between user and electrical
grid.
IC models are
suggestions only.
Isolation
Amplifier
(ISO124)
EMAIL: support@advancer.co
www.AdvancerTechnologies.com
© 2015
Setup Configurations (cont’d)
c) Grid powered with power and output isolation
Note: Isolation amplifier and
power isolator provide
isolation between user and
electrical grid.
IC models are
suggestions only.
Power Isolator
(R1SE-0505-R)
Isolation
Amplifier
(ISO124)
d) Grid powered.
Warning: No isolation.
Note: This configuration has no
isolation. Usually safe but
rare
situations
could create a
current loop to the electrical
grid. Not suitable for
commercial applications.
EMAIL: support@advancer.co
www.AdvancerTechnologies.com
© 2015
Setup Instructions
Note: Not To Scale
Example Sensor Location for Bicep
1)
2)
3)
Thoroughly clean the intended area with soap to remove dirt and oil
Snap electrodes to the sensor’s snap connectors
(Note: While you can snap the sensor to the electrodes after they’ve been placed on the muscle, we do not
recommend doing so due to the possibility of excessive force being applied and bruising the skin.)
4)
Place the sensor on the desired muscle
a. After determining which muscle group you want to target (e.g. bicep, forearm,
calf), clean the skin thoroughly
b. Place the sensor so one of the connected electrodes is in the middle of the
muscle body. The other electrode should line up in the direction of the muscle
length
c. Peel off the backs of the electrodes to expose the adhesive and apply them to
the skin
d. Place the reference electrode on a bony or nonadjacent muscular part of your
body near the targeted muscle
Connect to a development board (e.g. Arduino, RaspberryPi), microcontroller, or ADC
a. See configurations previously shown
EMAIL: support@advancer.co
www.AdvancerTechnologies.com
© 2015
Why is electrode placement important?
Raw EMG output
Innervation Zone
Correct Placement
Midline of the muscle belly
between an innervation zone
and a myotendon junction
Midline Offset
Myotendon Junction
Position and orientation of the muscle sensor electrodes has a vast effect on the strength of
the signal. The electrodes should be place in the middle of the muscle body and should be
aligned with the orientation of the muscle fibers. Placing the sensor in other locations will
reduce the strength and quality of the sensor’s signal due to a reduction of the number of
motor units measured and interference attributed to crosstalk.
EMAIL: support@advancer.co
www.AdvancerTechnologies.com
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