For the measurement of blood pressure, we have used the principle of oscillometry.
We use an automatic wrist handle that exists on the market and that we have modified by installing a physical interface with a terminal block that connects through the I2C communication protocol with our device. The handle is controlled by the system, thereby fully automating the blood pressure data acquisition and presentation process.
Pulse Transit (PTT)
As a second option, we obtain the PPG by optically measuring the changes in the volume of blood on the skin tissue, while the electrocardiogram sensor can detect the electrical activity of the heart. The most interesting feature of is that we can simultaneously display PPG and ECG, resulting in synchronized ECG and PPG values. This allows us to calculate the pulse transit time (PTT) as an indirect measure of blood pressure.