Cardio Respiratory Monitor Free

This app uses your device’s built-in sensors to measure a person’s breathing and heartbeat rates. It gets as close to the source as possible - your chest movements!

It collects sensor readings several times each second while the device is resting on the subject’s chest. The app makes use of a technology in your device called ‘sensor fusion,’ which combines the readings of multiple sensors to isolate such variables as linear acceleration, rotation, and gravity. The app monitors the change in angle to determine the breathing and heartbeat rates.

To use this app, your device must have gyroscopes, accelerometers, and magnetometers and a version of Android that supports these technologies.

When you press ‘Start’ on the main screen the app begins to prepare the device for the measurements (for 10 seconds). During this time, place the device on the subject’s chest. Once the measurements begin, the ‘Start’ button changes to ‘Busy.’ The measurements take about 20 seconds. Once the measurements are done, the breathing and heartbeat rates (in bpm) are shown, as well as the amplitudes of each. Also shown are plots of the breathing movements and the average movement (‘pulse’) due to the heartbeat (as angle versus time in arbitrary units).

Starting wiith version 2.0, this app now also measures heartbeat rate with your device’s built-in camera and light. If your device lacks the required motion sensors, you can still measure your heartbeat rate! This is the only app that uses more than one method to measure heartbeat rate!