bluetooth

Just got a CarPlay for my vehicle and was wondering how to add a lithium battery Bluetooth monitoring to it any one know how to do it?

Cost about $40 bucks in parts: 1 - Seeeduino (3.3v Arduino Clone) (Seeeduino 4.2 (CFAPN15062) from Crystalfontz ) 2 - DS18B20 Temp Sensors (One-Wire Temperature Sensor (WRDOWY17) from Crystalfontz ) 1 - BLE BluTooth Module ( ) 1 - 12v Buck Converter ( ) 1 - 5k resistor to pull-up the temp...