Then, an Arduino board might be exactly what you're looking for. This open-source hardware platform comes in a multitude of versions, from the classic Uno ... the R4 WiFi introduces new pinouts ...

The Arduino Uno R4 is to have a Renesas RA4M1 32-bit Arm Cortex-M4 microcontroller ... Renesas RA4M1 super-set block diagram. 48pin versions do not miss out on many major peripherals, except the LCD ...