«Taidacent Smart Mattress Breathing Sleep Belt Heart Rate Respiration Sensor Espiratory Heart Rate Piezo Restive Pressure Sensors»

https://www.aliexpress.com/item/1005003212843492.html?spm=a2g0o.cart.0.0.58f93c004oO6Y4&mp=1

Is this sensor belt in this sleep tracker?

https://www.aliexpress.com/item/4000016737162.html?spm=a2g0s.9042311.0.0.27424c4d8PccMO

The Aliexpress respiratory belt is very sensitive, the signal reminds of the signal of a Bitalino Physioplus Inductive sensor:

https://plux.info/sensors/317-respiration-rip.html

see also the discussion here:

https://www.eevblog.com/forum/testgear/read-out-sensor-data-from-sleep-tracker-with-bluetooth-sniffer-tools/msg3471796/#msg3471796

Scott Harden, PhD. MD. says, the sensor belt could be used instead of the ECG breakout board in his Sound Card ECG device, but I suppose it should be possible to connect the belt to an Adinstruments, iworx or Biopac recorder.

Sound Card ECG and Sound Card Respiratory belt, open source hardware and open source software for physiological sensors, that is interesting. There are different toolboxes available for heart rate, for instance the Bitalino Matlab toolbox, I suppose such algorithms are also available for Octave or Python. There are also different toolboxes available for respiratory rate from respiratory belts from companies like Biopac, Vernier, or PLUX Wireless Biosignals. But are there any open source software projects available for respiratory belts?