Frankly, all the component I decided to buy is base on the price and many diy web and vids, I see bluepill , GY-5210 MPU 6050 , VL53V0X need 3.3v and others need 5v to work normal excluding motors so I buy two LM2596S.
About the sensors, I buy 4 IR I/O sensors bacause its cheap the reason why I buy MPU 6050 and VL53V0X is I thought MPU 6050 will improve the bot navigation when steering like 90° or 180° faster and VL53V0X is for the distant so the bot will know when to slow, when to fast.
About the motors GA12 N20 is the only options that I could bought bacause no others N20 that I found is sale onl in my province, if it has the price is out of my budget.
About Batteries, when I wonder what ratio to should I buy when choosing motors I read a datasheet then choosing 1:50 because I want fast with 240rmp at 6v so thats why I decided to buy two 18650 battery 3.7V.
Thank you very much.