In this project a +18V and a -18V dual power supply is implemented.

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ESP8684H4 based thermostat module which will control the heater. The module will have 18650 Li-Ion battery cell with 3.7V nominal voltage. The module also has a switch-mode buck NVDC power path which can simultaneously charge the battery and provide power to the system. The system voltage is 3.3V. Input voltage is 5V from USB-C. The system also contains a temperature, humidity and pressure sensor. The Wi-Fi and Bluetooth antenna implemented by PCB tracks.

BGA159C80P14X14_1200X1200X150 https://www.nxp.com/docs/en/data-sheet/SJA1105PQRS.pdf 5-port automotive Ethernet switch 1.5 NXP SJA1105SEL

A simulated blinking LED circuit using an astable multivibrator a.k.a "flip-flop" as a square wave generator. It also includes PCB layout of the project.