Quantity   Component name
1 × Espressif ESP32 SoC QFN https://espressif.com/en/products/hardware/esp32/overview
1 × MAX30003 Single-Channel Integrated Biopotential (ECG, R to R Detection) AFE https://www.maximintegrated.com/en/products/analog/data-converters/analog-front-end-ics/MAX30003.html
1 × W25Q32FVSSIQ Memory ICs / FLASH Memory
1 × AP2112K-3.3 Power Management ICs / Linear Voltage Regulators and LDOs
1 × TSX-3225 Frequency Control / Crystals
1 × FT231XS Microprocessors, Microcontrollers, DSPs / Microprocessors (MPUs)
1 × More detailed BOM available on FindChips https://www.findchips.com/org/10-open-hardware/list/32829-pcheartypatchsch