I've built my first prototype. The inductive EC method seems to work in this configuration (ESP-WROOM-32D + STM32F407VET6 + ADC (DC/DC) + RS485 (STM32) + 18B20 + DHT22 + SSD1306). What else do I need to connect? I'll be making a second version of the board.

I've built my first prototype. The inductive EC method seems to work in this configuration (ESP-WROOM-32D + STM32F407VET6 + ADC (DC/DC) + RS485 (STM32) + 18B20 + DHT22 + SSD1306). What else do I need to connect? I'll be making a second version of the board.