We’ve covered a fair number of development boards following Adafruit Feather form factor in the last year or so with products such as QuickFeather Cortex-M4 + FPGA board, OrangeCrab (Lattice FPGA), nRF9160 Feather providing LTE IoT & GPS connectivity, and other boards.
But here’s yet another Adafruit Feather themed board that has just launched: FeatherS2. The tiny board is equipped with the latest Espressif Systems ESP32-S2 WiFi SoC, 16 MB SPI Flash, 8 MB PSRAM, several I/O, and a USB-C port for power and programming.
FeatherS2 key features and specifications:
- SoC – ESP32-S2 single-core Tensilica LX7 processor @ 240 MHz, RISC-V ultra-lower power co-processor, 320 kB SRAM, 128 kB ROM
- Memory – 8 MB extra PSRAM
- Storage – 16 MB SPI Flash
- Connectivity – 2.4 GHz Wi-Fi – 802.11b/g/n with 3D antenna
- USB – 1x USB-C port for power and programming
- Sensor – ALS-PT19 Ambient Light Sensor
- 16 + 12 through holes for up to 21x GPIOs, I2C, SPI, UART, DAC, touch interface, ADC, and power signals
- QWIIC/STEMMA connector
- Misc – Power, charger and user LEDs, RGB LED,
- Power Supply
- 5V via USB-C port
- 2-pin battery connector
- 2x 700 mA 3.3 V LDO regulator
- Optimized power path for low-power battery usage
- LiPo battery management
- Dimensions – Approx. 5.1 x 2.3 cm (Adafruit Feather form factor)
You may wonder why there are two LDO voltage regulators on the board. The developer, unexpected maker, explains:
The first one is for the general operation of the board and the ESP32-S2, RAM and Flash.
The second LDO is for you to use to connect external 3V3 modules, sensors and peripherals, and it has programmable EN control tied to GPIO21 + it’s connected to the deep sleep capabilities of the S2, so if the S2 goes into deep sleep, the 2nd LDO is automatically shut down for you!
FeatherS2 boards currently ships with CircuitPython 6.0 beta1, and everything has been tested and working, except for analog input support that is still under development. If you don’t feel like programming with Python, C++ is an option with early support for the ESP-IDF and Arduino code.
Unexpected Maker sells the board directly on his website for $20 plus shipping, and cheaper unit prices if you order a pack from 2 to 10 boards.