
Circuit Playground Bluefruit
Educational Board
Round educational microcontroller with Nordic nRF52840 (64MHz Cortex-M4F + BLE), 10 NeoPixels, accelerometer, microphone, light sensor, speaker, 8 alligator-clip I/O pads, and USB. Runs CircuitPython,
ARM Cortex-M4F @ 64MHz (Nordic nRF52840)256KB SRAM1MB + 2MB SPI FlashWiFi falseBLE Bluetooth 5.0 BLE (nRF52840)Zigbee falseEthernet false
~$25View

Adafruit Feather STM32F405 Express
Microcontroller Board
High-speed Feather-form-factor dev board with STM32F405 ARM Cortex-M4F @ 168MHz, 1MB Flash, 192KB RAM, 2MB SPI Flash, USB-C, STEMMA QT, SD card socket, and LiPo charging. Adafruit's fastest CircuitPyt
ARM Cortex-M4F @ 168MHz (STM32F405)192KB SRAM1MB + 2MB SPI FlashWiFi falseBLE falseZigbee falseEthernet false
~$25View
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More to explore — popular traits shared by devices with Flash: 1MB + 2MB SPI Flash.