412 ARDUINO SHIELD EKG EMG ECG EEG MANUAL

412_ARDUINO_SHIELD_EKG-EMG-ECG-EEG_MANUAL

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ARDUINO SHIELD EKG/EMG/ECG/EEG

Description:
This is an EKG/EMG shield which allows Arduino like boards to capture Electrocardiography
Electromiography signals. The shield opens new possibilities to experiment with bio feedback. You can
monitor your heartbeat and log your pulse, recognize gestures by monitoring and analize the muscule activity.

Features:
 Stackable headers up to 6 channels may be stacked and wired to A0-A6 analogue inputs.
 Calibration signal generation by D4/D9 digital output.
 Precise Trimmer potentiometer for calibration.
 Input connector for normal or Active electrodes.
 Works with both 3.3V and 5V Arduino boards.

Hardware:
 SHIELD-EKG-EMG schematic in PDF format released under Creative Commons Attribution-Share Alike

3.0 United States License.
 SHIELD-EKG-EMG schematic and board in Eagle format released under Creative Commons Attribution-

Share Alike 3.0 United States License.

Software:
 Electric guru monitoring software.
 Arduino example for EKG capture and interface to Electric Guru for OLIMEXINO-328/Arduino boards
 Maple example for EKG capture and interface to Electric Guru for OLIMEXINO-STM32.
 Pinguino example for EKG capture and interface to Electric Guru for PIC32-PINGUINO/OTG/MX220.

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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
are different and not compatible!
There are two electrode cables that we have tested with the board. They are named SHIELDEKG-EMG-PA and SHIELD-EKG-EMG-PRO. The first one is considered open-hardware
and its schematics might be used as a reference if you wish to make the cable yourself.
The SHIELD-EKG-EMG-PRO works with different set of attachment cups that makes it
easier to measure EMG signals at hard-to-reach spots and also allow contact materials
replacement.
Links to the web-pages of the electrodes:
- https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PA/open-source-

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hardware
- https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PRO/
Different pads for SHIELD-EKG-EMG-PRO electrode:
- https://www.olimex.com/Products/Modules/Biofeedback/ECG-GEL-ELECTRODE/
- https://www.olimex.com/Products/Duino/Shields/ECG-CLIP/
- https://www.olimex.com/Products/Duino/Shields/ECG-SCUP/
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/.

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

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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
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 – USB mini 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.
If the host board provides reference voltage on the AREF pin then open REF_E jumper. We
don't want two supplies to provide power to the same line – the 3V_REF_ADC one.
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

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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
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 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

RST

3.3V

D10

GND

D11

GND

D12

Vin

D13

GND

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
The position of the REF_E jumper depends on the "host" board. If the "host" board provides
voltage on the AREF pin of the digital connector REF_E has to be open. If there is no voltage
provided on the AREF pin then SHIELG-EKG-EMG's REF_E jumper has to be closed.
If both boards provide reference voltage to the 3V_REF_ADC line (and AREF pin
respectively) then there would be a circuit conflict which might damage a component on one
of the boards.
You need to ensure only one of the boards provides AREF voltage.
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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3.3V/5V
HR1x3(3.3V:Close;5V:Open)

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%

VCCA

3
2
1

SR1
R

AP431SA

R21
10k/1%

V_REF

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

C19

R23
10k/1%

C24

R20
2k/1%

10µF/6.3V/0805

100nF/X7R/10%

1
2
3
4
5
6
7
8

1.5V_REF

1uF/X5R/10%

10nF/X7R/10%

100nF/X7R/10%

C23

C12

C20

1
TLC277IDR
4

R22
10k/1%

A0
A1
A2
A3
A4
A5

NA(PN1X6)
CON3

D4/D9
HR1x3(D4:Open;D9:Close)

R19
330R

C21

IC2A

1.5V_REF_BUF

C11
100nF/X7R/10%

1
2
3
4
5
6

3V_REF_ADC
8

C22

1
3
5
7
9
11

HR2x6(1-2:Close)

VCCA
C10

NA(PN1X6)
CON2

AIN_SEL

R29
2k/1%

ANALOG

10k/1%

BZV55C6V2

DIGITAL

GND_CAL R28

PWR
GYX-SD-TC0805SURK(RED)

Frequency is set to be approx: (10-14)Hz

When 3.3V power sup pl y is use d:
3.3Vp -p +/-10% => 1 65µVp-p +/-10 %

3V_REF_ADC

D8
D9
D10
D11
D12
D13
GND
AREF

DIGITAL

Square wa ve Ca li bration Signal

When 5V p ower suppl y i s used:
5Vp-p +/-10% => 250µVp-p +/-10%

RST
3V3
5V
GND
GND
VIN

ARDUINO: SH PLATFORM

R26
100R/1%

1
2

C25

CAL_SIG should be PWM output

C26

1M/1%

voltage d ivider 1:20000

HR1x2(Open)

1
2
3
4
5
6

22µH/±10%/1.7ohm/80mA(LB2012T220K/8030984)

10nF/X7R/10%

CAL

1M/1%

CAL_SIG
C27

10k/1%

R24

100nF/X7R/10%

R25

10µF/6.3V/0805

R27

V_CAL

POWER

CON1

3
2
1

VCCA

NA(PN1X8)

V_REF
47µF/10%/6.3V/TANT(C)/ESR/0.25ohm(TR3C476K6R3C0250/1754044)

2k/1%

VCCA
D1
BAV199(1156415)
BAV199(1156415)

V_REF

C1
10nF/X7R/10%

R32
2k/1%

10k/1%

C28

100pF/COG/5%

2k/1%

NA(3.3M) V_REF

VCCA
V_REF

2k/1%

NA(3.3M) V_REF

2
3
7

R30

REF

160k

40k

4 0k

160k

VOUT

1
RG 8
SHUTDOWN 4
VA3

VINVIN+
V+

0 R(boad m ounted)

INA321EA

C13

NA
3
2

C29 NA
R10
1M/1%

3
3

C4 100nF/X7R/10%

R12

TR1
20k 1

R11

1k/1%

10nF/X7R/10%

IC1A
MCP607-I/SN
1

1uF/X5R/10%

G= (R17/R16)+1= 3.56

Fc=0.16Hz

R31

0R(boa d m o unted )

3rd order "Besselworth" filter, fc = 40Hz.

1 pole

G=5,76...101

Fc=0.16Hz

PGS2

1-L
SCJ325P00XG0B02G

CH1_IN+

100pF/COG/5%

PGS1

3-R

PG B1 0 1 0 6 0 3 MR( F 2 5 9 4 T R- ND) PG B1 0 1 0 6 0 3 MR( F 2 5 9 4 T R- ND)

CH1_IN-

R1
CH_IN

G=5*(1+R8/R7)=10

HF rejection

High-Pass filter

G=1+R12/(TR1+R11)

1 pole

VCCA

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%

C14

R16
3.9k/1%

10nF/X7R/10%

C15

R18
3.9k/1%

10k/1%
1nF/X7R/10%

C16
1uF/X5R/10%

C5 1uF/X5R/10%
V_REF
C6

7
6

R17

V_REF

V_REF V_REF

1uF/X5R/10%

IC2B
TLC277IDR

100k/1%

V_REF

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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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412 ARDUINO SHIELD EKG EMG ECG EEG MANUAL

412_ARDUINO_SHIELD_EKG-EMG-ECG-EEG_MANUAL

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