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Bluepill with SPI

features two hardware SPI ports (SPI1 and SPI2) on the STM32F103C8T6 microcontroller, supporting speeds up to 18 Mbps. The default SPI port (SPI1) is primarily wired to pins PA4-PA7, commonly used to connect displays, sensors, and flash memory. [1]

Bluepill with WIFI

Adding WiFi capability to an STM32 “Blue Pill” (like an ESP8266 or ESP32). Because the Blue Pill has no onboard wireless radio, you communicate with the WiFi module via UART or SPI using AT commands or pre-built firmware (such as WiFiNINA)

RS232 to RS485 Converter

An RS-232 to RS-485 converter is a hardware adapter that translates point-to-point RS-232 signals into balanced, differential RS-485 signals. It allows legacy serial devices (like PCs and microcontrollers) to communicate over long distances (up to 1200 meters/4000 feet) and multi-drop networks