MOD-EKG development board
lead-free
MOD-EKG development board
User's manual
All boards produced by Olimex are ROHS compliant
Document revision B, December 2016
Page 1 of 17
INTRODUCTION:
BOARD FEATURES:
Based on Texas Instruments aDDlication note SLAA280a
INTRODUCTION:
MOD-EKG is an implementation of the hardware design proposed by Texas In-
struments in their document “Heart-Rate and EKG Monitor Using the MSP430FG439”
(document name “slaa280a”). MOD-EKG is an open-hardware, open-software project.
The user places his index fingers and thumbs at the metallic pads of the board and the
heartbeat rate per minute gets displayed on the LCD. In addition, the application outputs
a digital data stream to a serial data interface which allows you to display EKG wave-
form on a PC. The serial interface is available at the UEXT connector. Using our serial
↔ USB adapter. A connection between the PC and MOD-EKG can be achieved by us-
ing our adapter – MOD-USB-RS232 that converts the serial interface to USB, and vice
versa.
An electrocardiogram (ECG), also called an EKG, is a graphic showing the
voltage generated by the heart muscle during a heartbeat. In this application, the EKG
waveform is used by the MCU to measure the heartbeat rate. Because heartbeat calcula-
tion is the major focus the electrodes are simplified to two points for collecting data, one
for the right hand and the other for the left hand.
BOARD FEATURES:
Microcontroller: MSP430FG439
EKG amplifiers with INA321EA
14-pin 0.1” step JTAG connector for direct microcontroller access via
MSP430 debugger to debug the software or to power the board
UEXT connector that allows easier connection to other boards
Custom LCD display
3V CR2032 Lithium coin battery holder
Extension rows of pinholes for all microcontroller ports – with no plastic
connectors placed
No additional electrodes required! Right and left hand contact board-
mounted electrodes – HR1 and HR2
Two status LEDs
Two user buttons
A switch to alternate between “battery” and “UEXT” power supply
Based on Texas Instruments application note SLAA280a
FR-4, 1.5 mm, red soldermask, white component print
Dimensions: (3.0 x 2.8)" ~ (76 x 71)mm
Page 2 of 17
ELECTROSTATIC WARNING:
BOARD USE RE UIREME
EMOCH MOD-USB-RSZ32
MSP430-JTAG-TINY—V2 MSP430-
JTAG-ISO-MKZ
ELECTROSTATIC WARNING:
The MOD-EKG board is shipped in protective anti-static packaging. The board must
not be subject to high electrostatic potentials. General practice for working with static
sensitive devices should be applied when working with this board.
BOARD USE REQUIREMENTS:
In order to set up the PIC32-RETROBSD board optimally one or more additional items
may be needed. They might be generally placed in two categories: Required – items
that are needed in order to achieve minimum functionality; Recommended – items that
is good to have in order to be able to interact with the most important of the features of
the board.
a) Required items:
- A source of power; preferably a battery. MOD-EKG can take power from a number
sources:
1) +3V CR2032 Lithium battery placed in the battery connector at the back –
when switch BAT/UEXT is in position BAT.
2) JTAG deubgger placed in the JTAG connector – when jumper P_IN is closed
and P_OUT is opened.
3) Pins #1 (3.3V) and #2 (GND) of the UEXT connector – when switch
BAT/UEXT is in position UEXT; you can also supply 3V from a battery to these
pins
The power supply source gets selected by changing jumpers P_IN and P_OUT
and using the BAT/UEXT switch.
IMPORTANT: MOD-EKG is a sensitive board and glitches or noises in the power
supply lines might affect the readings. Even if the USB ports and the power supply unit
are of good quality, there is still parasitic capacitance between the human body and
mains power line, which affects the readings. Be sure to test with a 3V battery – either
insert a good CR2302 coin battery directly in the connector at the back of MOD-EKG
or attach a 3V battery to the UEXT. If you wish to power the board from the JTAG or
external power supply make sure there is galvanic isolation or good filtering between
the power supply and the MOD-EKG board. For example, if you want to isolate your
JTAG debugger from the mains power influence you can use our USB-ISO product
(between the computer's USB port and the JTAG debugger).
b) Recommended items:
- serial to USB adapter board – to connect to a personal computer; you can use a
number of our low cost solutions, for example, B B- 340CH or MOD-USB-RS232; note
that the examples for computer connection use MOD-USB-RS232
- MSP430-compatible debugger with 14-pin (2 x 7) 0.1” step connector; if you want a
compatible low-cost Olimex product consider MSP430-JTAG-TINY-V2 or MSP430-
JTAG-ISO-MK2
Page 3 of 17
PROCESSOR FEATURES:
PROCESSOR FEATURES:
MOD-EKG board uses ultralow power microcontroller MSP430FG439 from Texas
Instruments with the following features:
Low Supply-Voltage Range, 1.8 V to 3.6 V
Ultralow-Power Consumption:
Active Mode: 300 μA at 1 MHz, 2.2 V
Standby Mode: 1.1 μA
Off Mode (RAM Retention): 0.1 μA
Five Power Saving Modes
Wake-Up From Standby Mode in Less Than 6 μs
16-Bit RISC Architecture, 125-ns Instruction Cycle Time
Single-Channel Internal DMA
12-Bit A/D Converter With Internal Reference, Sample-and-Hold and Autoscan
Feature
Three Configurable Operational Amplifiers
Dual 12-Bit D/A Converters With Synchronization
16-Bit Timer_A With Three Capture/Compare Registers
16-Bit Timer_B With Three Capture/Compare-With-Shadow Registers
On-Chip Comparator
Serial Communication Interface (USART), Select Asynchronous UART or
Synchronous SPI by Software
Brownout Detector
Supply Voltage Supervisor/Monitor With Programmable Level Detection
Bootstrap Loader
Serial Onboard Programming, No External Programming Voltage Needed
Programmable Code Protection by Security Fuse
Integrated LCD Driver for Up to 128 Segments
60KB+256B Flash Memory
2KB RAM
Page 4 of 17
BLOCK DIAGRA
DVccuz DVssvz AVcc AVss
XIN xouT
r_*_#_____¢__%_ + ¢_________$____;___$___$___$____$_
x‘rzw J)- ACLK
XTZOUT I ‘ ow'lam' Flash RAM ADC12 mom Pan ‘ Pon2
I FLL+ 4' SMCLK Pan 3 Port 4 Pan 5 Pan 6
60KB ZKB 12-5“! 12-51! 8 I/O 3 NO
| MCLK 12 Channels 2 Channe|s \mevrum Interrupt a v0 3 no a V0 5 l/O
I dons Conv. VoKage Out Capahihly Capan-my
I A A A A A
I 9 MHz MAE
' CPU ‘ * { § * § § § * *
I Incl IS ‘
I Regmevs A MDB
: ‘_ V V v V v V V v v
Emulation
I Modu‘e < poh/="" dma="" wfi‘ffifg="" “’"slbs="" tm,="" a3="" tfizz‘f‘="" lcd="" usartd="" vo‘="" om="" 5v5]="" connollev="" war="" 3="" cc="" he="" 7="" oompamov="" 123="" 0a2="" i="" bvownoul="" ‘="" chame‘="" shauowg="" 3="" cc="" reg="" a="" ‘="" interrupt="" 152°gz‘elz‘fix="" usetmggge="" 3="" am="" 5="" i="" jtag=""><— ‘5/15-3‘1="" reg="" vec1m="" ,="" ,="" ,="" of="" p="" i="" menace="" ‘—="" l.__________________="" fist/nm="" ron="" 'i="">BLOCK DIAGRAM:
MEMORY ORGANIZATION:
Memory Size 60KB
Main: interrupt vector Flash OFFFFh — OFFEOh
Main: code memory Flash OFFFFh — 01100h
Information memory Size 256 Byte
Flash 010FFh — 01000h
Boot memory Size 1KB
ROM OFFFh — OCOOh
RAM Size 2KB
09FFh — 0200h
Peripherals 16-bit 01 FFh — 0100h
8-bit OFFh — 010h
8-bit SFR OFh — 00h
MEMORY ORGANIZATION:
Page 6 of 17
H:
SCHEMATIC:
Page 7 of 17
BC-20 01
IS-1390(Default: UEXT is closed)
10nF
10uF/6.3V
10nF 100nF
100nF
100nF
100nF
100nF
NA NA
100nF
10uF/6.3V
100nF
100nF
1.5nF
NA
NA
1-2:Open; 2- 3:Close 1-2:Open; 2- 3:Close
BH14S
OLIMEX_LTD
GYX-SD-TC0805SURK(RED)
GYX-SD-TC0805SURK(RED)
NA(HN2X4) NA(HN2X4)
NA(HN2X4) NA(HN2X4)
NA(HN2X4) NA(HN2X4)
HN1x2(Open)
HN1x2(Close)
32768Hz/6pF
100k
10k 4.7k 4.7k
1k
1k
100k
100k
680k
680k
680k
100k/1%
100k/1%
2.2M/1%
2.2M/1%
820R
1M
NA
1M
10k 1M NA(0R)
NA NA
NA
150k
NA(0R)
NA(0R)
4.7k
NA(0R)
NA
NA
T1107A(6x3.8x2.5mm)
T1107A(6x3.8x2.5mm)
MSP430FG439
INA321EA
BH10SBH10SBH10SBH10SBH10SBH10SBH10SBH10SBH10SBH10S
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC VCC3.3V_UEXT
3.3V_UEXT
COM0
COM0
COM1
COM1
COM1
COM2
COM2
COM2
COM3
COM3
COM3
GND
GND
GND
GND
P1.0
P1.0
P1.1
P1.1
P1.2
P1.2
P1.3
P1.3
P1.3
P1.4
P1.4
P1.4
P1.5
P1.5
P1.5
P1.6
P1.6
P1.6
P1.7
P1.7
P2.0
P2.0
P2.1
P2.1
P2.2
P2.2
P2.3
P2.3
P2.3
P3.0 P3.0
P3.0
P3.4
P3.4
P3.4
P3.5
P3.5
P3.5
P3.6
P3.6
P3.6
P3.7
P3.7
P3.7
P6.0
P6.0
P6.0
P6.1
P6.1
P6.1
P6.2
P6.2
P6.2
P6.3
P6.3
P6.3
P6.4
P6.4
P6.4
P6.5
P6.5
P6.5
P6.6
P6.6
P6.6P6.6
P6.7
P6.7
P6.7
R03
R13
R13
R23
R23
R33
R33
RST
RST
S0
S0
S0
S1
S1
S1
S2
S2
S2
S3 S3
S3
S4 S4
S4
S5
S5
S5
S6
S6
S6
S7
S7
S7
S8
S8
S8
S9
S9
S9
S10
S10
S11
S11
S12
S12
S13
S13
S14
S14
S15
S15
S16
S16
S17
S17
S18
S18
S18
S19
S19
S19
S20
S20
S21
S21
S22
S22
S23
S23
SIMO0
SIMO0
SIMO0
SOMI0
SOMI0
SOMI0
TCK
TCK
TDI
TDI
TDO
TDO
TMS
TMS
UCLK0
UCLK0
UCLK0
URXD0 URXD0
URXD0
UTXD0
UTXD0
UTXD0
VCC
VCC
VCC
VEREF+
VEREF+
VEREF-
VEREF-
VREF+
VREF+
XIN
XOUT
+ -
3V-LI_BAT
11
22
33
4
4
5
5
6
6
BAT/UEXT
C1
C2 C3
C4
C5
C6
C7
C8
C9 C10
C11
C12
C13
C14
C15
C16
C17
HR1
HR2
HR3
HR4
1
2
3
J1
1
2
3
J2
12
34
56
78
910
1112
1314
JTAG
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
2425
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
LCD
LED1
LED2
12
34
56
78
PORT1
12
34
56
78
PORT2
12
34
56
78
PORT3
12
34
56
78
PORT4
12
34
56
78
PORT5
12
34
56
78
PORT6
1
2
P_IN
1
2
P_OUT
Q1
R1
R2
R3 R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20 R21 R22
R23 R24
R25
R26
R27
R28
R29
R30
R31
1
2
3
4
REF
SW1
SW2
AVCC
80
AVSS
78
COM0 44
DVCC1
1
DVCC2 52
DVSS1
79
DVSS2 53
P1.0/TA0
67 P1.1/TA0/MCLK
66 P1.2/TA1
65 P1.3/TBOUTH/SVSOUT
64 P1.4/TBCLK/SMCLK
63 P1.5/TACLK/ACLK
62 P1.6/CA0
61
P1.7/CA1 60
P2.0/TA2 59
P2.1/TB0 58
P2.2/TB1 57
P2.3/TB2 56
P2.4/UTXD0 55
P2.5/URXD0 54
P2.6/CAOUT/S19 31
P2.7/ADC12CLK/S18 30
P3.0/STE0/S31 43
P3.1/SIMO0/S30 42
P3.2/SOMI0/S29 41
P3.3/UCLK0/S28 40
P3.4/S27 39
P3.5/S26 38
P3.6/S25/DMAE0 37
P3.7/S24 36
P4.0/S9 21
P4.1/S8
20 P4.2/S7
19 P4.3/S6
18 P4.4/S5
17 P4.5/S4
16 P4.6/S3/A15
15 P4.7/S2/A14
14 P5.0/S1/A13
13 P5.1/S0/A12/DAC1
12
P5.2/COM1 45
P5.3/COM2 46
P5.4/COM3 47
P5.5/R13 49
P5.6/R23 50
P5.7/R33 51
P6.0/A0/OA0I0
75
P6.1/A1/OA0O
76
P6.2/A2/OA0I1
77
P6.3/A3/OA1I1/OA1O
2
P6.4/A4/OA1I0
3
P6.5/A5/OA2I1/OA2O
4
P6.6/A6/DAC0/OA2I0
5
P6.7/A7/DAC1/SVSIN
6
R03 48
RST/NMI
74
S10 22
S11 23
S12 24
S13 25
S14 26
S15 27
S16 28
S17 29
S20 32
S21 33
S22 34
S23 35
TCK
73
TDI
71 TDO/TDI
70
TMS
72
VEREF+/DAC0
10
VREF+
7
VREF-/VEREF-
11
XIN
8
XOUT
9
XT2IN
69 XT2OUT
68
U1
REF
5
RG 1
SHUTDOWN 8
V+
7V- 4
VIN+
3VIN-
2
VOUT 6
U2
UEXT-1
UEXT-2
UEXT-3
UEXT-4
UEXT-5
UEXT-6
UEXT-7
UEXT-8
UEXT-9
UEXT-10
MOD-EKG
Rev. B
COPYRIGHT(C) 2011, OLIMEX Ltd.
http://www.olimex.com/dev
+
a
b
c
d
e
f g
OLIMEX
umHF
GN D
0R
0R
0R
0R
A1
160 k 40k
A2
160 k40k
A3
UEXTJTAG
POWER SUPPLY
Extensions
LCD
ECG amplifiers
P_OUT
PORTS
PORTZ
LCD
PORT1
BAT/UEXT
HR1
P_I N JTAG UEXT J1
J 2
PORT3
PORT4
PORTS
REF
HRZ
SW1 LED1 LEDZ SW2
3V-LI_BAT
BOARD LAYOUT:
Page 8 of 17
POWER SUPPLY CIRCUIT:
RESET CIRCUIT:
CLOCK CIRCUIT:
JUMPER DESCRIPTION:
Default state is opened.
POWER SUPPLY CIRCUIT:
MOD-EKG can take power from:
1) +3V CR2032 Lithium battery placed in the battery connector at the back –
when switch BAT/UEXT is in position BAT.
2) JTAG deubgger placed in the JTAG connector – when jumper P_IN is closed
and P_OUT is opened.
3) Pins #1 (3.3V) and #2 (GND) of the UEXT connector – when switch
BAT/UEXT is in position UEXT; you can also supply 3V from a battery to these
pins
The power supply source gets selected by changing jumpers P_IN and P_OUT
and using the BAT/UEXT switch.
RESET CIRCUIT:
MOD-EKG reset circuit includes R1 (100k), C1(10nF), JTAG pin 11 and
MSP430FG439 pin 74 (RST/NMI).
CLOCK CIRCUIT:
Quartz crystal (Q1) 32.768 kHz is connected to MSP430FG439 pin 8 (XIN) and pin 9
(XOUT).
JUMPER DESCRIPTION:
P_IN
When this jumper is closed, the board is power supplied by the
standard JTAG pin 2. This is only possible when the
consumption of the board is not very high which is typically the
case with MSP430 microcontrollers. If this jumper is open the
board should be power supplied by another external source.
This jumper and P_OUT should always be reversely
open/closed, i.e. if P_IN is closed, P_OUT should be open and
vice versa.
Default state is opened.
P_OUT
When this jumper is closed, the board is power supplied not by
the JTAG but from external source. Then the JTAG has to
synchronize with the working voltages which is done through
this line. This is especially important when debugging with
JTAG. This jumper and P_IN should always be reversely
Page 9 of 17
Default state is closed.
Default state is shorted in position 2-3t
Default state is shorted in position 2-3t
open/closed, i.e. if P_OUT is closed, P_IN should be open and
vice versa.
Default state is closed.
J1
When jumper J1 is shorted in position 1-2, UEXT pin 3 is
connected to MSP430FG439 pin 55 (P2.4/UTXD0) – signal
“UTXD0”. When jumper J1 is shorted in position 2-3, UEXT
pin 3 is connected to MSP430FG439 pin 54 (P2.5/URXD0) –
signal “URXD0”.
Default state is shorted in position 2-3.
J2
When jumper J2 is shorted in position 1-2, UEXT pin 4 is
connected to MSP430FG439 pin 54 (P2.5/URXD0) – signal
“URXD0”. When jumper J2 is shorted in position 2-3,
UEXT pin 4 is connected to MSP430FG439 pin 55
(P2.4/UTXD0) – signal “UTXD0”.
Default state is shorted in position 2-3.
Depending on jumpers J1 and J2 configuration, the board can work in host, or in device
mode. The default state of J1 and J2 is for device mode (shorted in position 2-3).
INPUT/OUTPUT:
LED1 (red) connected to MSP430FG439 pin 67 (P1.0/TA0).
LED2 (red) connected to MSP430FG439 pin 65 (P1.2/TA1).
User button with name SW1 connected to MSP430FG439 pin 59 (P2.0/TA2).
User button with name SW2 connected to MSP430FG439 pin 58 (P2.1/TB0).
Power supply switch with name BAT/UEXT – when in position BAT – the board is
power supplied via +3V lithium battery, when is in position UEXT – the board is
connected to other board with UEXT and is power supplied by the other board via
UEXT connector.
LCD custom display.
Page 10 of 17
EXTERNAL CONNECTORS DESCRIPTION:
UEXT:
246810
EXTERNAL CONNECTORS DESCRIPTION:
UEXT:
Pin # Signal Name
1 VDD
2 GND
3 TX
4 RX
5 P1.4
6 P1.5
7 SOMI0
8 SIMO0
9 UCLK0
10 P3.0
Page 11 of 17
PORT]:
JTAG:
Pin # Signal Name Pin # Signal Name
1 TDO 2 Via P_IN to VCC
3 TDI 4 Via P_OUT to VCC
5 TMS 6 Not Connected
7 TCK 8 Not Connected
9 GND 10 Not Connected
11 RST 12 Not Connected
13 Not Connected 14 Not Connected
PORT1:
Pin # Signal Name Pin # Signal Name
1 P1.0 2 P1.1
3 P1.2 4 P1.3
5 P1.4 6 P1.5
7 P1.6 8 P1.7
Page 12 of 17
PORTZ:
PORTS:
PORT4:
PORT2:
Pin # Signal Name Pin # Signal Name
1 P2.0 2 P2.1
3 P2.2 4 P2.3
5 UTXD0 6 URXD0
7 S19 8 S18
PORT3:
Pin # Signal Name Pin # Signal Name
1 P3.0 2 SIMO0
3 SOMI0 4 UCLK0
5 P3.4 6 P3.5
7 P3.6 8 P3.7
PORT4:
Pin # Signal Name Pin # Signal Name
1 S9 2 S8
3 S7 4 S6
5 S5 6 S4
7 S3 8 S2
Page 13 of 17
PORT$
PORT&
REE
PORT5:
Pin # Signal Name Pin # Signal Name
1 S1 2 S0
3 COM1 4 COM2
5 COM3 6 R13
7 R23 8 R33
PORT6:
Pin # Signal Name Pin # Signal Name
1 P6.0 2 P6.1
3 P6.2 4 P6.3
5 P6.4 6 P6.5
7 P6.6 8 P6.7
REF:
Pin # Signal Name Pin # Signal Name
1 VEREF+ 2 VREF+
3 VEREF- 4 GND
Page 14 of 17
MECHANICAL DIMENSIONS:
E
E
v.
L“.
N
E E E E E E E
E E E E E E E E E
E E \‘1 m \o x—I r\ H 00
’\ a L”. '\. “2 a} G! ”2 L“.
“i 03 \o H La V! N l\ 00
H m \‘1 m m «- LO \0 \0
68.58 "“
070
68.86 3°
55.88 ERIN“
070 52.22] mm_
+8.26 3°
N“ F.“
43.18 mm 0
OO 00
0° DDOUUUDOUUUOOUUUUGUUUUCU 00
35.56 mm 0
“*‘ 31.75 mm_
27.94 mm E g
24.13 mm_
:39 H . m.
+ +
762 mm X 18.67 mm_
—s.99 mm X E ED rm 3 X
_ 6.08 mnb
E E E E E
E E E E E E E E
E E E
H H T Ln N
g “'07 ‘2 '\. ‘1 5°. "'
- 01.01. 00 N v- m \-|
8'00 ‘0 H LDI ‘0' \0I l\
MECHANICAL DIMENSIONS:
Page 15 of 17
AVAILABLE DEMO SOFTWARE:
6: LINK
htmsz//www.olimex.com/Products/Modules/Biofeedback/MOD-EKG/
ORDER CODE:
HOW TO ORDER?
www.01imex.c0m
REVISION HISTORY:
AVAILABLE DEMO SOFTWARE:
1. Example that demonstrates heart rate measuring, using MSP430FG439
microcontroller, requires IAR EW and JTAG tool. Available for download here: LINK
2. Instructions on connecting MOD-EKG to PC computer with the help of MOD-USB-
RS232, available here: LINK
For more information visit the web-page of the product:
https://www.olimex.com/Products/Modules/Biofeedback/MOD-EKG/
ORDER CODE:
MOD-EKG – assembled and tested board
HOW TO ORDER?
You can order directly from our web-shop! Please visit our web www.olimex.com for
more information.
REVISION HISTORY:
Hardware revision: Rev. B, April 2011
Document revision: Rev. Initial, June 2011
Rev. B, December 2016 – added important note about the main
power supply influence over the readings; improved warranty and
support information
Page 16 of 17
: Support@0 mex com
For product support, hardware information and error reports mail to: support@olimex.com.
All document or hardware feedback is welcome. Note that we are primarily a hardware
company and our software support is limited. Please consider reading the paragraph below
about the warranty of Olimex products.
All goods are checked before they are sent out. In the unlikely event that goods are
faulty, they must be returned, to OLIMEX at the address listed on your order invoice.
OLIMEX will not accept goods that have clearly been used more than the amount needed to
evaluate their functionality.
If the goods are found to be in working condition, and the lack of functionality is a
result of lack of knowledge on the customers part, no refund will be made, but the goods
will be returned to the user at their expense.
All returns must be authorized by an RMA Number. Email support@olimex.com for
authorization number before shipping back any merchandise. Please include your name,
phone number and order number in your email request.
Returns for any unaffected development board, programmer, tools, and cables permitted
within 7 days from the date of receipt of merchandise. After such time, all sales are
considered final.
Returns of incorrect ordered items are allowed subject to a 10% restocking fee. What is
unaffected? If you hooked it to power, you affected it. To be clear, this includes items
that have been soldered to, or have had their firmware changed. Because of the nature of
the products we deal with (prototyping electronic tools) we cannot allow returns of items
that have been programmed, powered up, or otherwise changed post shipment from our
warehouse.
All returned merchandise must be in its original mint and clean condition. Returns on
damaged, scratched, programmed, burnt, or otherwise 'played with' merchandise will not be
accepted.
All returns must include all the factory accessories which come with the item. This
includes any In-Circuit-Serial-Programming cables, anti-static packing, boxes, etc.
With your return, enclose your PO#. Also include a brief letter of explanation of why the
merchandise is being returned and state your request for either a refund or an exchange.
Include the authorization number on this letter, and on the outside of the shipping box.
Please note: It is your responsibility to ensure that returned goods reach us. Please use
a reliable form of shipping. If we do not receive your package we will not be held
liable.
Shipping and handling charges are not refundable. We are not responsible for any shipping
charges of merchandise being returned to us or returning working items to you.
The full text might be found at https://www.olimex.com/wiki/GTC#Warranty for future reference.
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