News AVR Projects
- coolmirza143
- Thu May 05 2011, 03:05 pm
Of all the body responses one could monitor, heart rate is one of the most important because it fluctuates greatly depending on our state of mind and physical condition. Heart rate during physical activity gives us a direct indication of our fitness level, and heart rate changes throughout the night can be clear indicators of when a dream cycle has begun. A heart rate monitor is also a very easy device to use for extended periods because it can
be placed on the body in such a way that is not uncomfortable or in the way of any normal activity.
The heart rate monitor project presented here uses a sensitive light-detecting resistor to detect small changes in the light beaming through your finger as your blood pumps through the tiny arteries in the finger. This device is not the same as the heart rate monitors typically used in hospitals because those use skin probes that detect changes in electrical activity as the heart beats. This heart rate monitor actually “sees†your pulse through the body, so it can be used on a finger, toe, or even your earlobe.
The heart rate monitor is a combination of analog and digital circuitry, as shown below.
The LM324 quad op amp (IC1) forms a sensitive amplifier and a low-pass filter that will “lock†onto tiny variations in voltage that fall within the typical heart rate frequencies. The varying voltage comes from the light-dependent resistor (LDR), which changes a very small amount each time blood pumps through the tiny arteries in between the visible red LED and the LDR surface.
if you feel any doubt or need further details feel free to use Forum.
Source: Evil Genius MPP Issue 2010
[Submitted by coolmirza143]
be placed on the body in such a way that is not uncomfortable or in the way of any normal activity.
The heart rate monitor project presented here uses a sensitive light-detecting resistor to detect small changes in the light beaming through your finger as your blood pumps through the tiny arteries in the finger. This device is not the same as the heart rate monitors typically used in hospitals because those use skin probes that detect changes in electrical activity as the heart beats. This heart rate monitor actually “sees†your pulse through the body, so it can be used on a finger, toe, or even your earlobe.
The heart rate monitor is a combination of analog and digital circuitry, as shown below.
The LM324 quad op amp (IC1) forms a sensitive amplifier and a low-pass filter that will “lock†onto tiny variations in voltage that fall within the typical heart rate frequencies. The varying voltage comes from the light-dependent resistor (LDR), which changes a very small amount each time blood pumps through the tiny arteries in between the visible red LED and the LDR surface.
Complete Design
Insert Your Fingure Here
Attachment
if you feel any doubt or need further details feel free to use Forum.
Source: Evil Genius MPP Issue 2010
[Submitted by coolmirza143]
Submit comment
Downloads
- Automatic Railway Gate Control by: Sharanjit Singh in: 8051 Projects
Tue Oct 15 2019, 12:47 pm - Yet Another DTMF Controlled Robot by: Er. Sharanjit Singh in: 8051 Projects
Tue May 07 2019, 02:45 pm - Simple 3 Digit Temperature Meter by: Rakesh Suthar in: PIC Projects
Sat Jul 05 2014, 11:45 am - Electronic Voting machine with Managed Control Unit (Project Report Included) by: Shivani, Geetika Gupta, Vibhore Aggarwal, Megha Singh in: 8051 Projects
Sat May 17 2014, 07:46 pm - LED Scrolling message Display using 8051 by: Pratik Suthar in: 8051 Projects
Thu May 08 2014, 04:28 pm
Comments
- Pure Sine Wave Inverter Using Atmel 89S2051 by: Jerrydauck
Fri Mar 01 2024, 08:51 am - Pure Sine Wave Inverter Using Atmel 89S2051 by: DennisVatry
Thu Feb 22 2024, 10:04 pm - Pure Sine Wave Inverter Using Atmel 89S2051 by: DonaldPaids
Thu Feb 22 2024, 03:45 pm - Pure Sine Wave Inverter Using Atmel 89S2051 by: Victornwh
Mon Feb 19 2024, 12:01 pm - Simple 3 Digit Temperature Meter by: Berfa Goma
Sun Jun 11 2023, 07:30 am
Bobbyerilar
Thu Mar 28 2024, 08:08 am
pb58
Thu Mar 28 2024, 05:54 am
Clarazkafup
Thu Mar 28 2024, 02:24 am
Walterkic
Thu Mar 28 2024, 01:19 am
Davidusawn
Wed Mar 27 2024, 08:30 pm
Richardsop
Tue Mar 26 2024, 10:33 pm
Stevencog
Tue Mar 26 2024, 04:26 pm
Bernardwarge
Tue Mar 26 2024, 11:15 am
Trending Topics
alarm and sensor interfacing AVR I2C tutorial code digital lock using pic micro schmitt trigger voltage divider AVR Copy memory block nokia 3310 LCD with 8051 recieved avr freaks HA Server vb version fbus new books Keil addons parallax ping)) sensor 8051 mt9d111 connection to lpc1768 multichip module technology difference startup boot code transistor for rf applications resistors Transform electromagnetic waves into sound