Projects :: hijack. HiJack is a hardware/software platform for creating cubic-inch sensor peripherals for the mobile phone. HiJack devices harvest power and use bandwidth from the mobile phone's headset interface. The HiJack platform enables a new class of small and cheap phone-centric sensor peripherals that support plug-and-play operation. HiJack has been tested with the iPhone 3G/3GS/4G, iPod Touch, and iPad devices. Power. Data. Sensing. Home made ECG - The first attempt. Yes, it strikes me as a little unfortunate that the brand on the tin can that this ECG is in reads 'heaven' (the patient's next destination?) And that the name of this site is neozap. If we can pass this awkward position, let me introduce the home made ECG #1 Objective: Build an ECG for giggles, make sure it works, eliminate 50Hz interference.
>> Here is the first post I made on the overclockers forum ( I've built a home made ECG to these designs: Unfortunately, while I can see the QRS complex, the P & T waves get lost in the noise. It looks like everybody has atrial fibrillation - not good! Here's the physical device: As you can see, I have surface mounted it inside a tin can, intending to reduce the interference. I've also used shielded audio cable (single core, braided outer) for the electrode leads. This is a view of the 'inside' of the can.
So, i've put the electrics in a tin box. Quote: More suggestions. DIY ECG Machine On The Cheap » SWHarden.com. Note from the Author: This page documents how I made an incredibly simple ECG machine with a minimum of parts to view the electrical activity of my own heart. Feel free to repeat my experiment, but do so at your own risk. There are similar projects floating around on the internet, but I aim to provide a more complete, well-documented, and cheaper solution, with emphasis on ECG processing and analysis, rather than just visualization. If you have any questions or suggestions please contact me. Also, if you attempt this project yourself I’d love to post your results! Good luck! Background You’ve probably seen somebody in a hospital setting hooked up to a big mess of wires used to analyze their heartbeat. The goal of such a machine (called an electrocardiograph, or ECG) is to amplify, measure, and record the natural electrical potential created by the heart.
[picture] The smooth curve in the ECG (P) is caused by the stimulation of the atria via the Sinoatrial (SA) node in the right atrium.
ECG Measurement System. ECG Measurement System Chia-Hung Chen, Shi-Gun Pan, Peter Kinget CAUTION: Be very careful when you measure signals on humans. Carefully read and apply the necessary safety procedures! We cannot be held responsible for any harm caused by using any of the circuits or procedures described on this site. We also do not claim any of the circuits or procedures are safe. Contents 1. 2. 3.ECG circuits 3.1 Instrumentation Amplifier 3.2 Opto-Coupler 3.3 Bandpass Filter 4.Measured ECG signal 5. 1.
The ECG system is shown on Figure 1. . (1) The first stage is a transducer—AgCl electrode, which convert ECG into electrical voltage. . (2) The second stage is an instrumentation amplifier (Analog Device, AD624), which has a very high CMRR (90dB) and high gain (1000), with power supply +9V and -9V. (3) We use an opto-coupler (NEC PS2506) to isolate the In-Amp and output. (4) After the opto-coupler is a bandpass filter of 0.04 Hz to 150 Hz filter. Figure 1 Function blocks of the ECG system Return to outline 2. 3. 4. 5. Paulus.pdf (application/pdf Object)