AN2944

Model for creating a plethysmograph

Doc ID 15467 Rev 1

7/12

Figure 4.

Schematic diagram for the analog front-end plethysmograph

In order to acquire the pulse wave measurement, we suggest connecting the output pin of

the analog board (pin 6 of J6 in figure above) to a digital subsystem where the input of a

microcontroller (e.g. STM32) can be acquired through an A/D converter. The board that

implements the analog front-end and a picture showing the measurement setup are

presented in Figure 5 and 6.

Figure 5.

Analog front-end demonstration board

Figure 6.

Entire system