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. 2019 Apr 2;19(7):1590. doi: 10.3390/s19071590

Figure 1.

Figure 1

Conceptual schematic of the prototype. PSoC = Programmable System on Chip; BLE = Bluetooth Low-Energy; PPG = photoplethysmography; ECG = electrocardiography; PWM = Pulse Width Modulation; UART = Universal Asynchronous Receiver Transceiver; JTAG = Joint Test Action Group.