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ECG Arduino shield

2 years ago 2185
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Description

ECG Arduino shield

BACKGROUND KNOWLEDGE

-Electrocardiogram (ECG/EKG): it is the electrical activities of the heart. During each heartbeat, a healthy heart has an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers, spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers. figure (1): A normal ECG signal. A normal ECG signal.

The electrodes are placed on the body of the patient according to universal protocol “12 leads ECG electrodes placement” which include the three basic leads [Bipolar leads]: Lead (1): The electrodes will be connected to the RA, LA (Right Leg always connected to ground). Lead (2): The electrodes will be connected to the RA, LL (Right Leg always connected to ground). Lead (3): The electrodes will be connected to the LL, LA (Right Leg always connected to ground).

Figure (2): ECG lead connections. ECG lead connections.

The aim of the project

Engineers, particularly biomedical engineers are strongly involved in solving many problems related to human body in which they might need to make use of the natural biological signals of the body [like ECG]. Such biological signal requires reliable safe-to-use bio-amplifiers that can integrate with microcontrollers or other digital systems. Upon researching this area a gap was found between the Engineering community and the biomedical engineering problems which can be summarized (safety-cost-reliability-time) The aim of this project is to build low cost safe to use Arduino shields that will help students, lecturers, beginners and developers with no background in electronics and/or programming to get those biological signals in analog form so they can build their projects easily, with high efficiency regarding the size, weight, and outputs. Extra features were added to each shield to draw more value from such shields like QRS detector, voltage comparator, and monostable timer.

the output will be via the analog pin of the Arduino [Pin0] and the digital Pins [pin3/pin4]. Audio QRS is achieved via a Buzzer

the system has a total Gain of (G=1100), 50Hz Notch filter and bandwidth of the range (0.05Hz to 150Hz) with optional QRS filter and a bypass switch for the Notch filter

The obtained ECG signal displayed on an oscilloscope The obtained ECG signal displayed on an oscilloscope

Documents

New Schematic 2

ECG shiled 1.1 copy

final PCB

BOM

ID Name Designator Footprint Quantity
1 ARDUINO U1 ARDUINO 1
2 AD620ARZ U2,U6 SOIC-8_150MIL 2
3 Audio-PJ30070 J1 AUDIO-PJ307C 1
4 Header-Female-2.54_1x6 P1,P4 HDR-6X1/2.54 2
5 Header-Female-2.54_1x8 P2,P3 HDR-8X1/2.54 2
6 5.1k R1 0402 1
7 220nF C1 0603 1
8 15M R2 0402 1
9 11k R3,R4 0402 2
10 100nF C2 0603 1
11 15k R5,R6 0402 2
12 100nF C3 0603 1
13 220nF C4,C5,C6,C7,C8,C10,C11 0603 7
14 7.5k R7 0402 1
15 1k R8,R9 0402 2
16 Header-Female-2.54_1x4 P5 4PinHeader SMD 1
17 100k R9,R10,R12,R8,R11 TRIM_POT_PTH 5
18 TL074 U4 SOIC-14_150MIL 1
19 -SWITCH U5,U7,U9,U3 CON3 4
20 LM311DG U6,U10 SOIC-8_150mil 2
21 4.7k R11,R10 0402 2
22 62k R13 0402 1
23 36k R14 0402 1
24 555 Timer U8 SOIC8- NA555 Timer 1
25 10nF C9 0603 1
26 100k R15 0402 1
27 BUZZER SG1 BUZZER-12MM 1
28 Header-Female-2.54_1x10 P6 HDR-10X1/2.54 1
29 TL074ACD U2,U3,U4,U5,U8 SOIC14N 5
30 4N25M U7 DIP-6 1
31 220n C1,C4,C5 RAD-0.1 3
32 13M R2 0402 1
33 100n C2,C3 0603 2
34 440n C6 RAD-0.1 1
35 Header-Female-2.54_1x4 P5 HDR-4X1/2.54 1
36 TL074 U9 DIP14 1

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