To Do

Hardware Completion

DS3231's Interrupt Pin

Code Completion

Usage of RGB LED
SIM900A

Code Correction

DS3231's Alarm Time Output, Alarm Clearance
RC522

Test and Callibration

DSM501A
NEO7M

Hardware Renewal

Modules and Components

BME280
RCWL0156

Connections

MPU9250
SIM900A