Pulseoximetery Electronic Designs Breakout boards Protocentral Pulse Ox using TI AFE4490 $80 Analog Front Ends Texas Instruments General AFE4490 for clinical sensors Analog Devices General ADPD105 for clinical sensors ADPD106 for clinical sensors Maxim MAX30101, fully integrated, does not allow connecting to clinical sensor MAX86180, driver for 8 external LEDs and 8 photodiodes