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Adafruit TinyS3 is a u.FL Board that is the Latest in the Tiny Series from Unexpected Maker

Written by Stephen Vicinanza

Adafruit TinyS3 is a u.FL board is the latest in the Tiny series from Unexpected Maker. The TinyS3 is the Tiny Mighty ESP32-S3 development board in the TinyPICO format. This board carries a u.FL connector rather than an antenna.

Those times when a longer-range antenna is needed or wanted the u.FL connector is ready to receive a long-range antenna. The connector is also an added benefit if the board is being placed in a case or enclosure.

These board features are well-suited for many projects.

  • RISC-V ultra-low power core
  • 32-bit dual core 240MHz
  • Bluetooth 5 BLE + Mesh
  • 2.4 GHz Wi-Fi – 802.11 b/g/n
  • 8MB QSPI Flash
  • 8MB Extra QSPI PSRAM
  • USB-C Connector
  • ultra-low deep sleep current
  • Reverse USB back-feed protection
  • 700mA 3.3V LDO Regulator
  • LiPo Battery Charging
  • Low Power RGB LED
  • JST pads on the back support PH connector
  • Red (Power) Orange (Charging) LEDs
  • 17x GPIO broken out
  • USB Serial JTAG
  • 3D High Gain u.FL connector
  • Compatible with the TinyPICO and TinyS2

The company is boosting a feature-packed board, with many peripherals and wireless connectivity. The board ships with the latest version of CircuitPython with ESP32-S3 support. It ships with the UF2 bootloader, so updates to the CircuitPython firmware are easier.

This board when connected to a computer is read as a USB flash drive, and easily installed and accessed. This board allows you to code directly to the drive, for ease and efficiency. Just copy the code over, or edit the code and save it to the drive. A simple way to code a microcontroller.

The TinyS3 can also use Arduino 2.0.3 or later which has added S3 support. There is also ESP-IDF and an early MicroPython port available.

For more information on the TinyS3 visit the product page here.

Adafruit |

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For the past 8 years, I have been writing about embedded technologies, added to my technical, academic, and medical editorial experience, with companies like Elsevier and Cambridge University Press. I tell people to read what I write, not try to pronounce my last name. I am always available for comments and suggestions you can reach me at and I promise I will take the time to reach back out to you. I live in the North East with my wonderful family.

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Adafruit TinyS3 is a u.FL Board that is the Latest in the Tiny Se…

by Stephen Vicinanza time to read: 1 min