# TinyS3 ESP32-S3 with u.FL

> Ultra-compact ESP32-S3 board by Unexpected Maker in TinyPICO form factor with u.FL external antenna connector, 8MB flash, 8MB PSRAM, LiPo charging, and dual-core 240 MHz.

## Quick Facts

- **Brand:** Unexpected Maker
- **Board Type:** dev-board
- **Price:** ~$20
- **Product Readiness:** developer
- **CPU:** ESP32-S3
- **CPU Architecture:** Xtensa LX7
- **CPU Cores:** 2
- **RAM:** 512KB SRAM
- **PSRAM:** 8MB
- **Flash:** 8 MB
- **Power:** 5V + LiPo
- **Operating Voltage:** 3.3V
- **Antenna:** U.FL/IPEX

## Connectivity

- **Wifi:** 802.11b/g/n
- **Bluetooth:** 5.0 LE + Mesh

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** No

## Compatible Firmware

circuitpython, micropython, arduino, esp-idf

## Use Cases

- iot
- wearable
- prototyping
- wifi
- education

## Components

- **ESP32-S3** (mcu): Dual-core Xtensa LX7 at 240 MHz, 512KB SRAM, Wi-Fi + BT5, native USB. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=tinys3-esp32-s3-ufl&source=md-export)

## Protocols

- **I2C**: SDA: GPIO3, SCL: GPIO4
- **SPI**: MOSI: GPIO35, MISO: GPIO36, SCK: GPIO37
- **UART**: TX: GPIO43, RX: GPIO44
- **I2S**: 

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| GPIO1 | D1 | GPIO | digital, adc |
| GPIO2 | D2 | GPIO | digital, adc |
| GPIO3 | SDA | I2C | i2c-sda, digital |
| GPIO4 | SCL | I2C | i2c-scl, digital |
| GPIO5 | D5 | GPIO | digital, pwm |
| GPIO6 | D6 | GPIO | digital, pwm |
| GPIO7 | D7 | GPIO | digital, pwm |
| GPIO8 | D8 | GPIO | digital, pwm |
| GPIO9 | D9 | GPIO | digital, pwm |
| GPIO10 | D10 | GPIO | digital, pwm |
| GPIO11 | D11 | GPIO | digital |
| GPIO12 | D12 | GPIO | digital |
| GPIO35 | MOSI | SPI | spi-mosi, digital |
| GPIO36 | MISO | SPI | spi-miso, digital |
| GPIO37 | SCK | SPI | spi-sck, digital |
| GPIO43 | TX | UART | uart-tx, digital |
| GPIO44 | RX | UART | uart-rx, digital |

## Available Software

- **[CircuitPython](https://openhardware.directory/r?to=https%3A%2F%2Fcircuitpython.org%2Fboard%2Funexpectedmaker_tinys3%2F&ref=openhardware.directory&product=tinys3-esp32-s3-ufl&source=md-export)**
- **[Getting Started](https://openhardware.directory/r?to=https%3A%2F%2Fesp32s3.com%2Fgetting-started.html&ref=openhardware.directory&product=tinys3-esp32-s3-ufl&source=md-export)**

## Description

## Overview

The TinyS3 with u.FL is a variant of Unexpected Maker's popular TinyS3 board, differing only in antenna configuration: instead of the onboard 3D PCB antenna, it provides a u.FL (IPEX/MHF1) connector for attaching an external antenna. This makes it ideal for projects installed inside metal enclosures, products requiring a specific antenna placement, or applications needing extended Wi-Fi and Bluetooth range.

The ESP32-S3 dual-core Xtensa LX7 processor runs at 240 MHz with 8 MB of QSPI flash and 8 MB of extra QSPI PSRAM — substantial resources for TensorFlow Lite models, image buffers, or CircuitPython with large libraries. The ultra-low deep-sleep current makes it suitable for battery-powered deployments. A 700 mA 3.3V LDO regulator, LiPo battery charging via JST-PH pads, VBAT voltage sense, and 5V presence detection are all included.

The TinyS3 u.FL maintains form-factor compatibility with TinyPICO and TinyS2 boards, and the UF2 bootloader enables drag-and-drop firmware updates. With 17 available GPIO pins and all standard ESP32-S3 peripherals, it is compatible with CircuitPython, Arduino 2.0.3+, MicroPython, and ESP-IDF. An external antenna (sold separately) must be connected before use.

## Where to Buy

- [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5747&ref=openhardware.directory&product=tinys3-esp32-s3-ufl&source=md-export) — 20

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5747&ref=openhardware.directory&product=tinys3-esp32-s3-ufl&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Funexpectedmaker%2Fesp32s3&ref=openhardware.directory&product=tinys3-esp32-s3-ufl&source=md-export)
- [schematic](https://openhardware.directory/r?to=https%3A%2F%2Fcdn-shop.adafruit.com%2Fproduct-files%2F5747%2Fschematic-tinys3.pdf&ref=openhardware.directory&product=tinys3-esp32-s3-ufl&source=md-export)

## Tags

`unexpected-maker`, `esp32-s3`, `tiny`, `ufl`, `external-antenna`, `circuitpython`, `lipo`, `psram`

## Images

![TinyS3 ESP32-S3 with u.FL](https://nbg1.your-objectstorage.com/openhardware-directory/entities/tinys3-esp32-s3-ufl/61fe56584164.jpg)
![TinyS3 ESP32-S3 with u.FL](https://nbg1.your-objectstorage.com/openhardware-directory/entities/tinys3-esp32-s3-ufl/275564e46dc4.jpg)

---
[View full device page](https://openhardware.directory/devices/tinys3-esp32-s3-ufl)