There are 2 variants. The standard version for $20, and a variant with headers $21.Nano ESP32 packs Wi-Fi®/Bluetooth® connectivity, 8 MB of internal and 16 MB of external flash memory, 512 kB RAM, as well as a USB-C® programming port and RGB LED. It supports 5V USB, 3.3 V operating and 6-12 V range power supply. All in just 45x18 mm!
UNO R4 preserves the standard form factor, shield compatibility, 5 V power supply and robustness of the UNO range while offering no less than a 32-bit Arm® Cortex®-M4 and a 16-fold increase in memory. Thanks to enhanced thermal design, the UNO R4 boards can be powered up to 24 V.
|RA4M1||256 kB Flash, 32 kB RAM|
|ESP32-S3||384 kB ROM, 512 kB SRAM|
|Memory||RA4M1||256 kB Flash, 32 kB RAM|