SparkFun

MyoWare 2.0 LED Shield

Name: MyoWare 2.0 LED Shield
Brand: SparkFun
SKU: SF-DEV-21869
Price: 54.1 AUD
Availability: OutOfStock

· MPN: DEV-21869

LED Strips & Bars Wearable Tech & E-textiles

$54.10 |

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This shield gives your MyoWare 2.0 Muscle Sensor an easy visual output, using a blue 10-segment bar graph to show the magnitude of a target muscle’s signal. ...

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This shield gives your MyoWare 2.0 Muscle Sensor an easy visual output, using a blue 10-segment bar graph to show the magnitude of a target muscle’s signal. As muscle activation increases, the LEDs climb further up the board.

It snaps onto the top side of the MyoWare 2.0 Muscle Sensor using the onboard snap connectors, with a power switch to turn the sensor on from the shield. A 40mAh single-cell LiPo battery is soldered to the board, helping provide cleaner battery-powered measurements and avoiding a current path back to mains-powered equipment.

Charging is handled through the USB Type-C connector with a dedicated LiPo charge circuit, and the board includes status LEDs for CHG, FULL and VIN. It fits into the MyoWare 2.0 ecosystem for solderless stacking with compatible shields and connection to a microcontroller analogue input.

Documentation available for this ecosystem includes a hookup guide, quickstart guide, advanced guide, MCP73831 datasheet, battery datasheet and MSDS, ArduinoBLE reference material, a GitHub example repo and the MyoWare 2.0 ecosystem page.

Features:

Signal display: Blue 10-segment bar graph shows the magnitude of the measured muscle signal.
Stackable design: Snap connectors allow the shield to stack on the top side of the MyoWare 2.0 Muscle Sensor.
Battery powered: Built-in LiPo battery can power the MyoWare 2.0 Muscle Sensor.
USB charging: Recharge the battery through the USB Type C connector.
Status indicators: Includes charging and power status LEDs for CHG, FULL and VIN.
Solderless ecosystem: MyoWare 2.0 shields snap together with a compact low profile.
Analogue measurement path: The MyoWare 2.0 ecosystem can connect to a microcontroller's analog input to measure raw, filtered, and rectified electrical activity of a target muscle.

Specifications:

Input Voltage: 5V via USB Type C Connector
Output Voltage (e.g. "VIN") Nominal Voltage: 3.7V
Output Voltage (e.g. "VIN") Fully Charged: 4.2V
Power Switch: Power Switch
Built-in LiPo Battery: Built-in LiPo Battery
Built-in LiPo Battery Rated Capacity: 40mAh
Built-in LiPo Battery Nominal Voltage: 3.7V
Built-in LiPo Battery Max Charge Current: 1C (40mA)
Charge IC: MCP73831 Single Cell LiPo Charge IC
Charge Rate: Set to 40mA
Form Factor: MyoWare® 2.0 Muscle Sensor Form Factor
Snap Pins: 3x Female Snap Pins (Power and EMG Envelope Output)
LEDs: VIN
LEDs: FULL
LEDs: CHG
LEDs: 2x 5-Segment Bars
Board Dimensions: 46.15mm x 38.00mm (1.82” x 1.50”)
Revision Changes: This revision of the MyoWare 2.0 LED Shield includes a 2-pin, 1.00mm pitch JST-SH connector.

MyoWare and the LED Shield are not intended for use in diagnosis, cure, mitigation, treatment or prevention of disease. It is suited to education, prototyping, workout feedback and creative myoelectric projects.

Jargon buster

Plain-language definitions for the technical terms used above.

LED: A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
LiPo: A LiPo (lithium polymer) battery is a rechargeable lithium battery widely used in portable projects because it is light and compact. LiPo cells need correct charging circuitry and careful handling to stay safe, so equipment that supports LiPo generally includes charging or protection hardware suited to that battery type.
MCP73831: A lithium battery charger chip used to safely charge a single-cell LiPo battery. It matters because it lets the board recharge a battery from USB or another input without needing a separate charger module.
microcontroller: A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
Shield: An add-on board that plugs into a main controller board to give it extra features such as sensing, motor control or communication. Knowing a product supports shields helps you judge whether it can connect neatly into an existing maker-board setup.
USB Type-C: USB Type-C is a small, reversible USB connector used for power, data and sometimes video on many modern devices. The connector itself does not guarantee a particular speed or voltage, so check the supported USB version, data rate and whether it carries more than 5V via USB Power Delivery.