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REAL ECG MACHINE WITH DATA TRANSMISSION THROUGH BLUETOOTH
INTRODUCTION
This project is based on VTU syllabus. The proposed system is based on ATMEL 89S52 µcontroller which is in our syllabus.
For doing this project we use some of the software like
Embedded C for programming the application software to the microcontroller.
Protel schematic software is used for designing the circuit diagram for this project.
Express PCB software is used for designing the PCB for this project.
(Since PCB making is a big process and involves lot of machineries which are expensive, we are going to outsource this to the manufacturer.)
ABSTRACT
In every hospital you have seen that if any patient wants to take ECG, The ECG wave is filtered of noise and amplified to a value able to be read by an Analog to Digital Converter. The data is fetched by a microcontroller and sent to a Bluetooth module via a UART. It is the aim of this thesis to develop a prototype of an electrocardiogram (ECG) sensor, capable of transmitting data via Bluetooth to a Doctor Monitoring System.
TECHNOLOGY BEHIND THIS PROJECT:
BLUTOOTH TECHNOLOGY.
ADC (Analog to Digital Converter).
% OF SOFTWARE AND HARDWARE :
Embedded ‘C’ 40%
Microcontroller and hardware 60%
OUR CHALLANGING WORK IN THIS PROJECT:
As embedded applications include more functionality, the challenge is making these functions accessible to the end user in a meaningful way.
Design the hand held hardware with led and stepper motor, LCD, Buzzer,LCD.
Design the power supply selector circuit for peripheral and controller.
Write the programmer for the main controller using embedded ‘c’ for 8051.
Design driver for a Bluetooth communication.
Write a driver for ADC and DAC conversion.
What is ECG?
ECG stands for “ELECTRO CARDIOGRAM’
It has been said, “What a piece of work is man”. The complexities of the human body and our biological systems exceed the most complex machines that we can produce. Our nervous system and synaptic processes are still not fully understood by the cleverest scientists.
Keeping this as the foundation we designed a device, which will measure the minute electrical impulses that are present due the action of the nerves of the heart muscle. These signals are in the microvolt range. So the device amplifies these signals and a general amplifier will amplify this signal. The signal is read by an Analog to Digital Converter. The data is fetched by a microcontroller and sent to a Bluetooth module via a UART. It is the aim of this thesis to develop a prototype of an electrocardiogram (ECG) sensor, capable of transmitting data via Bluetooth to a Doctor Monitoring System.
COMPONENTS USED
Power Supply 5v DC - LM 7805
Microcontroller - 89C51Atmel (Atmel.Com)
Crystal - 11.0592MHz
LCD - (Liquid crystal display) 2x16
Buzzer - Freq-1 to 18khz.Volt-5v-12vDC
Switch
LED
CRO
TL074 (LOW NOISE JFET INPUT OPERATIONAL AMPLIFIERS)
INA114 (Precision INSTRUMENTATION AMPLIFIER)
LF353P (JFET-INPUT DUAL OPERATIONAL AMPLIFIER)
Digital to analog converter(DAC)
Analog to digital Converter(ADC)
WORKING PRINCIPLE
The project consists of hardware for both transmit and receive the ECG signals, so in doctor side if the doctor wants patient’s ECG signal, the doctor will press the activation switch. Communication will proceed between doctor side system and patient side system.
The ECG probe connected to the patient body will give ECG signals, ECG signal in electrical impulses that are present due the action of the nerves of the heart muscle. These signals are in the microvolt range. So the device amplifies these signals and a general amplifier will amplify this signal. The signal is read by an Analog to Digital Converter. In the patient side system will read signal
In digital form. The digital data is fetched by a microcontroller and sent to a Bluetooth module via a UART. Doctor side system will read the digital data from Bluetooth device through UART. Then this digital data converted into analog data using DAC. These signal connected to computer or Oscilloscope to verify the signals.