IC identification, pt. 5 (sensors):

Maxim Integrated MAX86902 heart rate sensor/integrated pulse oximetry/UV sensor module (likely)

STMicroelectronics LSM6DS3 3-axis accelerometer/gyroscope

Bosch Sensortec BMP280 pressure sensor

AKM Semiconductor AK09911 3-axis electronic compass

ABLIC, Inc. (Formerly Seiko Instruments) S-5712CCDL1-I4T1U Hall sensor