SHIELD-EKG-EMG bio-feedback shield USER`S MANUAL

SHIELD-EKG-EMG bio-feedback shield
USER’S MANUAL
All boards produced by Olimex LTD are ROHS compliant
Revision D, April 2013
Designed by OLIMEX Ltd, 2011
OLIMEX© 2012
SHIELD-EKG-EMG
DISCLAIMER
© 2013 Olimex Ltd. Olimex®, logo and combinations thereof, are registered trademarks of Olimex Ltd. Other
product names may be trademarks of others and the rights belong to their respective owners.
The information in this document is provided in connection with Olimex products. No license, express or
implied or otherwise, to any intellectual property right is granted by this document or in connection with
the sale of Olimex products.
This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License. To view a
copy of this license, visit http://www.creativecommons.org/licenses/by-sa/3.0/.
This hardware design by Olimex LTD is licensed under a Creative Commons Attribution-ShareAlike 3.0
Unported License.
The software is released under GPL.
It is possible that the pictures in this manual differ from the latest revision of the board.
The product described in this document is subject to continuous development and improvements. All particulars
of the product and its use contained in this document are given by OLIMEX in good faith. However all
warranties implied or expressed including but not limited to implied warranties of merchantability or fitness for
purpose are excluded. This document is intended only to assist the reader in the use of the product. OLIMEX
Ltd. shall not be liable for any loss or damage arising from the use of any information in this document or any
error or omission in such information or any incorrect use of the product.
This evaluation board/kit is intended for use for engineering development, demonstration, or evaluation purposes
only and is not considered by OLIMEX to be a finished end-product fit for general consumer use. Persons
handling the product must have electronics training and observe good engineering practice standards. As such,
the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or
manufacturing-related protective considerations, including product safety and environmental measures typically
found in end products that incorporate such semiconductor components or circuit boards.
Olimex currently deals with a variety of customers for products, and therefore our arrangement with the user is
not exclusive. Olimex assumes no liability for applications assistance, customer product design, software
performance, or infringement of patents or services described herein.
THERE IS NO WARRANTY FOR THE DESIGN MATERIALS AND THE
COMPONENTS USED TO CREATE SHIELD-EKG-EMG. THEY ARE
CONSIDERED SUITABLE ONLY FOR SHIELD-EKG-EMG.
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WARNING:
EKG DEVICE DISCLAIMER
IEC601 is a standard that specifies tests and requirements that medical devices
must pass before they can be used on humans. However, none of the devices
built from these designs have been tested according to these guidelines because
of the costs involved. Therefore, a device based on any of these designs may not
be used for medical purposes as no medical claims are made.
NOTE THAT CONNECTING A DEVICE VIA ELECTRODES TO
HUMANS OR ANIMALS IS POTENTIALLY HAZARDOUS AND MAY
RESULT IN ELECTRIC SHOCK AND/OR SEIZURE.
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Table of Contents
DISCLAIMER.....................................................................................................2
SECTION 1 OVERVIEW...................................................................................5
1.1 Scope................................................................................................................................5
1.2 Features...........................................................................................................................5
1.3 Similar boards.................................................................................................................5
1.4 Organization...................................................................................................................6
SECTION 2 SETTING UP THE SHIELD-EKG-EMG...................................7
2.1 Electrostatic Warning....................................................................................................7
2.2 Requirements..................................................................................................................7
2.3 Powering up the board...................................................................................................8
2.4 Arduino/Maple/Pinguino note.......................................................................................8
SECTION 3 SHIELD-EKG-EMG BOARD DESCRIPTION.......................10
3.1 Layout (Top view):.......................................................................................................10
3.2 Layout (Bottom view):..................................................................................................11
SECTION 4 INSTALLATION EXAMPLE....................................................12
4.1 SHIELD-EKG-EMG and OLIMEXINO-328............................................................12
SECTION 5 HARDWARE...............................................................................14
5.1 Arduino shield connector.............................................................................................14
5.2 Trimmer TR1................................................................................................................14
5.3 Jumper description.......................................................................................................14
5.4 Custom electrode connection.......................................................................................16
SECTION 6 SCHEMATICS.............................................................................17
6.1 Eagle schematics...........................................................................................................17
6.2 Physical dimensions......................................................................................................19
SECTION 7 REVISION HISTORY................................................................20
7.1 Document revision........................................................................................................20
7.2 Web page of your device..............................................................................................20
7.3 Ordering info................................................................................................................20
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SECTION 1 OVERVIEW
Thank you for choosing the SHIELD-EKG-EMG prototype board from Olimex! This
document provides a User’s Guide for the Olimex SHIELD-EKG-EMG. As an overview, this
chapter gives the scope of this document and lists the board’s features. The document’s
organization is then detailed.
1.1 Scope
The SHIELD-EKG-EMG is an extension module for Olimex's ARDUINO compatible boards
– like OLIMEXINO-328, OLIMEXINO-STM32 and PIC32-PINGUINO, among others. The
shield is also compatible with ARDUINO boards including ARDUINO UNO. The board
comes with mounted connectors on it.
1.2 Features







Stackable shield (pass-through headers) - up to 6 shields forming 6 channels; mounted
on top of each other and wired to A0-A6 analogue inputs
Open hardware, open software project – user have access to all design documents
Calibration signal generation by D4/D9 digital output
Precise trimmer potentiometer for calibration (all boards are shipped completely assembled, tested and calibrated so you should not do this unless you wat to see how
things work)
Input connector for passive or active electrodes
Works with both 3.3V and 5V Arduino boards
Available examples for Arduino, Pinguino and Maple
1.3 Similar boards
MOD-EEG-SMT - an inexpensive unit for electroencephalography (EEG) - recording of
electrical activity along the scalp: https://www.olimex.com/Products/EEG/OpenEEG/EEGSMT/
PROTO-SHIELD - If you seek a board which follows the DUINO shield dimensions
specification and offers prototype area and 2 buttons with filter capacitors and 2 LEDs. Web
page of the product: https://www.olimex.com/Products/Duino/Shields/PROTO-SHIELD/
SHIELD-LOL – If you are searching for a shield with 126 LED matrix (14x9) available in 4
colors and 4 different sizes of the LEDs. Web page:
https://www.olimex.com/Products/Duino/Shields/SHIELD-LOL/
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1.4 Organization
Each section in this document covers a separate topic, organized as follow:
-Section 1 is an overview of the board usage and features
-Section 2 provides a guide for quickly setting up the board and introduces the user to
Arduino/Maple/Pinguino
-Section 3 contains the general board diagram and layout
-Section 4 show and example of setting up SHIELD-EKG-EMG with OLIMEXINO-328
-Section 5 covers the connector pinout, peripherals and jumper description
-Section 6 provides the schematics
-Section 7 contains the revision history
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SECTION 2 SETTING UP THE SHIELD-EKG-EMG
This section helps you set up the SHIELD-EKG-EMG development board for the first time.
Please consider first the electrostatic warning to avoid damaging the board, then discover the
hardware and software required to operate the board.
The procedure to power up the board is given, and a description of the default board behavior
is detailed.
2.1 Electrostatic Warning
The SHIELD-EKG-EMG development board is shipped in a protective anti-static package.
The board must not be exposed to high electrostatic potentials. A grounding strap or similar
protective device should be worn when handling the board. Avoid touching the component
pins or any other metallic element.
2.2 Requirements
In order to set up the SHIELD-EKG-EMG prototype board, the following items are required:
- SHIELD-EKG-EMG itself
- ARDUINO compatible board* (e.g. OLIMEXINO-328, OLIMEXINO-STM32, PIC32PINGUINO)
- Electrode cable**
*The pinout for the board strictly follows the DUINO extension specification. Best choice for
a board would be OLIMEXINO-328 or any DUINO board which utilizes the ATmega328
since we have working and tested examples for those MCUs, configuring them for
ATmega128 would require tweaking of the code.
**The cable features three electrodes – two data electrodes (1 channel) and DLR electrode
(feedback). If you use more than one SHIELD-EKG-EMG you can use cables without DLR
for every shield after the first.
IMPORTANT NOTE: The electrode cables for SHIELD-EKG-EMG and MOD-EEG-SMT
differ from each other.
In case you want to build a working SHIELD-EKG-EMG system without owning a DUNIO
board the best choice would be our board OLIMEXINO-328. This is the web page for the
board: https://www.olimex.com/Products/Duino/AVR/OLIMEXINO-328/.
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2.3 Powering up the board
The SHIELD-EKG-EMG board is powered by the host board it is mounted on. There is the
option to be powered either by 3.3V or 5.0V host board (configured easily by a jumper).
On powering the board PWR LED must become RED.
2.4 Arduino/Maple/Pinguino note
What is Arduino?
Arduino is an open-source electronics prototyping platform, designed to make the process of
using electronics in multidisciplinary projects more accessible. The hardware consists of a
simple open hardware design for the Arduino board with an Atmel AVR processor and onboard I/O support. The software consists of a standard programming language and the boot
loader that runs on the board.
Arduino hardware is programmed using a Wiring-based language (syntax + libraries), similar
to C++ with some simplifications and modifications, and a Processing-based Integrated
Development Environment (IDE).
The project began in Ivrea, Italy in 2005 aiming to make a device for controlling student-built
interaction design projects less expensively than other prototyping systems available at the
time. As of February 2010 more than 120,000 Arduino boards had been shipped. Founders
Massimo Banzi and David Cuartielles named the project after a local bar named Arduino. The
name is an Italian masculine first name, meaning "strong friend". The English pronunciation
is "Hardwin", a namesake of Arduino of Ivrea.
More information could be found at the creators web page http://arduino.cc/ and in the
Arduino Wiki http://en.wikipedia.org/wiki/Arduino.
To make the story short - Arduino is easy for beginners who lack Electronics knowledge, but
also does not restrict professionals as they can program it in C++ or mix of Arduino/C++
language.
There are thousands of projects which makes it easy to startup as there is barely no field
where Arduino enthusiasts to have not been already.
Arduino has inspired two other major derivatives - MAPLE and PINGUINO. Based on 8-bit
AVR technology the computational power of Arduino boards is modest, this is why a team
from MIT developed the MAPLE project which is based on ARM7 STM32F103RBT6
microcontroller. The board have same friendly IDE as Arduino and offers the same
capabilities as hardware and software but runs the Arduino code much faster. The Maple
project can be found at http://leaflabs.com
In parallel with Arduino another project was started called PINGUINO. This project chose its
first implementation to be with PIC microcontrollers, as AVRs were hard to find in some parts
of the world like South America so it is likely to see lot of PINGUINO developers are from
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that part of the world. PINGUINO project founders decided to go with Python instead Java
for processing language. For the moment PINGUINO is much more flexible than Arduino as
it is not limited to 8bit microcontrollers. Currently the IDE, which has GCC in background,
can support 8-bit PIC microcontrollers, 32bit PIC32 (MIPS) microcontrollers and
ARM7/CORTEXM3 microcontrollers which makes PINGUINO very flexible because once
you make your project you can migrate easily through different hardware platforms and not
being bound to a single microcontroller manufacturer. The PINGUINO project can be found
at: http://www.pinguino.cc.
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SECTION 3 SHIELD-EKG-EMG BOARD DESCRIPTION
Here you get acquainted with the main parts of the board. Note the names used on the board
differ from the names used to describe them. For the actual names check the SHIELD-EKGEMG board itself.
For example: BUTTON (seen on the op view below) is named BUT; RESET is named RST;
etc
3.1 Layout (Top view):
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3.2 Layout (Bottom view):
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SECTION 4 INSTALLATION EXAMPLE
This is a step by step example of installing SHIELD-EKG-EMG on OLIMEXINO-328 using
Windows. You can refer to the tips keeping in mind that the example utilizes a board with
ATmega328 MCU.
4.1 SHIELD-EKG-EMG and OLIMEXINO-328
In this example we use OLIMEXINO-328; SHIELD-EKG-EMG; USB - USBmini cable;
Arduino 1.0 IDE; two external libraries for the IDE (the latest versions of TimerOnev9 and
FlexiTimer2); the latest FTDI VCP drivers (2.08.14), demo code provided by us that can be
downloaded from the web site and free monitoring software Electric Guru.
0. IMPORTANT! Before starting you have to prepare the OLIMEXINO-328 board by
removing its wire between the R6 pads (R6 is not mounted). There is increased power
consumption and a chance of
electrical failure if you omit to do so. This is only for the
OLIMEXINO-328 board! Don't do the modification if you lack basic electronics skills,
because it is possible to damage the board.
1. Download and extract the Arduino 1.1 IDE package from the Arduino web site:
http://www.arduino.cc/
2. Download and place the two timer libraries required (TimerOne, FlexiTimer2) in
\arduino-1.0\libraries by placing each of them in properly named folder (check the
other libraries for reference)
http://arduino.cc/playground/Code/Timer1
http://www.pjrc.com/teensy/td_libs_MsTimer2.html
3. Download the demo project from product’s web page:
https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/
4. Download the FTDI VCP drivers: http://www.ftdichip.com/Drivers/VCP.htm
5. Set the jumpers of SHIELDEKG-EMG in the following
way:
REF_E – closed
3.3V/5V – 5V position
D4/D9 – D9 position
ANI_SEL – 1 position (channel)
6. Connect the shield to the
board
7.Connect OLIMEXINO-328 to
the USB
8. Install the VCP FTDI drivers by going in Device Manager; right-clicking over the
unrecognized device and choosing Update Driver and then pointing to the folder
where you downloaded and extracted the FTDI VCP driver.
Here it is advisable to go to Device Manager and from advanced settings of our
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recognized USB Serial Port (COMx) device to set x to a free port between 1 and 4
(because the monitoring software in this example can read only from COM ports 1 to
4).
9. Start Arduino IDE 1.0 and open the provided by Olimex project
ShieldEkgEmgDemo.pde
10. Set Tools -> Board -> Arduino Duemilanove w/ ATmega328
Set Tools -> Serial port -> the COM we configured our board at
11. Click Upload (→)
12. Download, install and start the software from this page:
https://www.olimex.com/Products/EEG/OpenEEG/EEG-SMT/resources/ElecGuru40.zip
13. It is advisable to adjust the settings in your ElecGuru program in Preferences->
Trace (waveform)… (depending how many channels/shields you use)
14. Choose the COM port your OLIMEXINO is connected to from Preferences ->
Serial port… (Remember you have to set it to COM 1 to 4)
15. You connect the electrodes to your right arm, left arm and the DLR to your right
leg
16. Start monitoring, adjust the settings until you receive an image like the one shown
on the picture
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SECTION 5 HARDWARE
You can get a good view of the hardware observing the board. All pins, connectors and
jumpers are named individually.
5.1 Arduino shield connector
These connectors follow the ARDUINO specification for shield connection. The shield comes
with soldered connectors making it ready for mounting on compatible board with the
possibility to have another shield mounted on it.
Pin #
POWER CON1
ANALOG CON2
DIGITAL CON3
DIGITAL CON4
1
RST
A0
D0
D8
2
3.3V
A1
D1
D9
3
5V
A2
D2
D10
4
GND
A3
D3
D11
5
GND
A4
D4
D12
6
Vin
A5
D5
D13
7
-
-
D6
GND
8
-
-
D7
AREF
6-pin and 8-pin connectors mounted (CON1, CON2 and CON3, CON4):
5.2 Trimmer TR1
Trimmer TR1 is calibrated during the factory testing. However it may be adjusted for the gain.
Use at own risk.
5.3 Jumper description
The names of the jumpers on the board correspond to the bold names used below:
3.3V/5V
This jumper controls the power circuit. Whether powered by 3.3V or 5V board.
Default state is 3.3V.
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REF_E
If you use only one shield this jumper has to be closed.
If you have multiple shields the first one should be closed; the respective REF_E jumpers on
every other shield above it should be open.
Default state is closed.
AIN_SEL
This jumper is responsible for which channel the current SHIELD-EKG-EMG would utilize.
If you have more than one shield one of them should have AIN_SEL in position 1, the second
in position 3, etc.
Default state is in position 1.
D4/D9
Controls pin D4/D9. Some processors utilize the default D9 pin so you have to switch to D4.
This jumper provides easy option to do so.
Default state is D9.
CAL
CAL jumper is used for feedback of the calibration and requires additional cable.
Default state is open.
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5.4 Custom electrode connection
To make the passive electrode yourself you need three cables, passive electrode surface and
audio jack. The way the signals go for connecting the audio jack is shown below:
Note that connecting active electrode that way will probably lead to electrical shock for
SHIELD-EKG-EMG. Only passive electrodes can be used with SHIELD-EKG-EMG.
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PIC-P26J50
SECTION 6 SCHEMATICS
6.1 Eagle schematics
SHIELD-EKG-EMG schematic is visible for reference here. But you can find it with better
resolution and stand-alone on the product’s web page:
https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/. They are located in
HARDWARE section.
The EAGLE schematic is situated on the next page for quicker reference.
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SHIELD-EKG-EMG
3.3V/5V
HR1x3(3.3V:Close;5V:Open)
1M/1%
1M/1%
C26
C25
PWR
GYX-SD-TC0805SURK(RED)
Z1
Frequency is set to be approx: (10-14)Hz
Whe n 3.3 V power su pply i s used:
3.3Vp-p +/-1 0% => 165 µVp-p +/-10%
10k/1%
BZV55C6V2
2
4
6
8
10
12
V_REF
SHIELD-EKG-EMG revision B
Designed by OLIMEX LTD. 2012
http://www.olimex.com/dev/
VCCA
100nF/X7R/10%
100nF/X7R/10%
1
2
3
4
5
6
7
8
D4
3
2
1
SR1
R
+
AP431SA
A
R21
10k/1%
D0
D1
D2
D3
D4
D5
D6
D7
NA(PN1X8)
CON4
CAL_SIG
1
2
3
4
5
6
7
8
REF_E
HR1x2(Open)
C17
100nF/X7R/10%
C18
10µF/6.3V/0805
C20
C19
R23
10k/1%
C24
100nF/X7R/10%
R20
2k/1%
C
1.5V_REF
1uF/X5R/10%
100nF/X7R/10%
100nF/X7R/10%
C23
10nF/X7R/10%
2
4
4
3
R22
10k/1%
1
TLC277IDR
100nF/X7R/10%
C12
C21
IC2A
1.5V_REF_BUF
C11
D4/D9
HR1x3(D4:Open;D9:Close)
R19
330R
A0
A1
A2
A3
A4
A5
NA(PN1X6)
CON3
3V_REF_ADC
8
8
C22
1
2
3
4
5
6
D9
VCCA
C10
1
3
5
7
9
11
HR2x6(1-2:Close)
VCCA
RST
3V3
5V
GND
GND
VIN
NA(PN1X6)
CON2
AIN_SEL
R29
2k/1%
3V_REF_ADC
1
2
GND_CAL R28
10nF/X7R/10%
Squa re wave Calib rati on Si gnal
Whe n 5V po wer sup ply i s used:
5Vp-p +/-10% => 250µVp-p +/-1 0%
C27
R26
100R/1%
100nF/X7R/10%
CAL_SIG should be PWM output
voltag e di vi der 1:2000 0
1
2
10µF/6.3V/0805
CAL
HR1x2(Open)
1
2
3
4
5
6
22µH/±10%/1.7ohm/80mA(LB2012T220K/8030984)
ANALOG
10k/1%
L1
CAL_SIG
DIG ITAL
R24
D8
D9
D10
D11
D12
D13
GND
AREF
DIG ITAL
R25
ARDUINO: SH PLATFORM
R27
V_CAL
POWER
CON1
3
2
1
VCCA
NA(PN1X8)
V_REF
V_REF
47µF/10%/6.3V/TANT(C)/ESR/0.25ohm(TR3C476K6R3C0250/1754044)
VCCA
D1
R32
BAV199(1156415)
2k/1%
V_REF
BAV199(1156415)
C1
10nF/X7R/10%
D2
G= (R17/R16)+1= 3.56
Fc=0.16Hz
V_REF
R7
10k/1%
R8
10k/1%
C28
U1
5
VCCA
V_REF
R2
R4
2k/1%
2k/1%
R6
NA(3.3M) V_REF
2
3
7
R30
C7
REF
1 60 k
4 0k
A1
40k
1 60 k
A2
VOUT
VINVIN+
V+
0R(boa d m o unted )
0R
1
RG 8
SHUTDOWN 4
VA3
INA321EA
C13
NA
R31
0R(bo ad m ounted)
6
0R
3
2
C29 NA
R10
1M/1%
3
3
C4 100nF/X7R/10%
R12
TR1
20k 1
R11
1
1k/1%
C8
10nF/X7R/10%
IC1A
MCP607-I/SN
1
1uF/X5R/10%
2
2k/1%
C2
2k/1%
3rd order "Besselworth" filter, fc = 40Hz.
1 pole
G=5,76...101
Fc=0.16Hz
VCCA
PGS2
1-L
SCJ325P00XG0B02G
CH1_IN+
2
NA(3.3M)
R3
100pF/COG/5%
3-R
R5
C3
PGS1
CH_IN
PG B 1 0 1 0 6 0 3 M R( F 2 5 9 4 T R-ND) PG B 1 0 1 0 6 0 3 M R( F 2 5 9 4 T R-ND)
CH1_IN-
R1
High-Pass filter
G=1+R12/(TR1+R11)
1 pole
G=5*(1+R8/R7)=10
HF rejection
100pF/COG/5%
High Voltage protection
OAmp with regulated gain!
High-Pass filter
Instrumental Amplifier
100k/1%
1nF/X7R/10%
C9
1uF/X5R/10%
R13
1M/1%
IC1B
MCP607-I/SN
R14
R15
56k/1%
330k/1%
5
C14
R16
3.9k/1%
10nF/X7R/10%
V_REF
V_REF
1uF/X5R/10%
IC2B
TLC277IDR
6
R9
5
100k/1%
7
R17
C15
R18
3.9k/1%
10k/1%
1nF/X7R/10%
C16
1uF/X5R/10%
C5 1uF/X5R/10%
C6
7
6
V_REF
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V_REF
V_REF V_REF
OLIMEX© 2012
SHIELD-EKG-EMG
6.2 Physical dimensions
As you can see below the dimensions follow the classic Arduino shield pin specification
making it compatible with all Olimex Duino boards.
Note: All dimensions are in inches!
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SECTION 7 REVISION HISTORY
7.1 Document revision
Revision
Changes
Modified
Pages
A
Initial Creation
All
B
C
D
E
Added important note on removing a wire at R6 pads
from OLIMEXINO-328
Fixed error on page 7 about the LED color
Added note on page 12 about possible damage due to
lack of experience
Changed schematic with a searchable one
Various formatting adjustments
Changed disclaimer section to represent the opensource nature of the shield
Added explanation of the cable
Changed formatting of the document
Updated links
11.12
7, 12, 16
2, 15
All
7.2 Web page of your device
The web page you can visit for more info on your device is
https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/.
There are examples and libraries available for Arduino IDE, Pinguino IDE and Maple IDE.
7.3 Ordering info
ORDER CODES:
SHIELD-EKG-EMG - completely assembled and tested
OLIMEXINO-328 – Arduino based board with ATmega328, fully compatible with SHIELDEKG-EMG
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