# ProS3 ESP32-S3 with u.FL

> Unexpected Maker's ProS3 ESP32-S3 with u.FL external antenna, 16MB flash, 8MB PSRAM, 27 GPIO castellated headers, dual LDO regulators, LiPo charging, and STEMMA QT.

## Quick Facts

- **Brand:** Unexpected Maker
- **Board Type:** dev-board
- **Price:** ~$29.95
- **Product Readiness:** developer
- **CPU:** ESP32-S3
- **CPU Architecture:** Xtensa LX7
- **CPU Cores:** 2
- **RAM:** 512KB SRAM
- **PSRAM:** 8MB
- **Flash:** 16MB
- **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:** No
- **PCB Layout:** No

## Compatible Firmware

circuitpython, micropython, arduino, esp-idf

## Use Cases

- iot
- prototyping
- wifi
- industrial
- commercial

## 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=pros3-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 |
| GPIO13 | D13 | GPIO | digital |
| GPIO14 | A2 | GPIO | analog, digital |
| GPIO15 | A3 | GPIO | analog, digital |
| GPIO16 | A4 | GPIO | analog, digital |
| GPIO17 | A0 | GPIO | analog, digital |
| GPIO18 | A1 | GPIO | analog, 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_pros3%2F&ref=openhardware.directory&product=pros3-esp32-s3-ufl&source=md-export)**
- **[Product Page](https://openhardware.directory/r?to=https%3A%2F%2Fpros3.io%2F&ref=openhardware.directory&product=pros3-esp32-s3-ufl&source=md-export)**

## Description

## Overview

The ProS3 with u.FL is the external-antenna variant of Unexpected Maker's ProS3 development board, featuring a u.FL (IPEX/MHF1) connector instead of the integrated PCB antenna. It is targeted at professional and commercial applications where the antenna must be positioned externally — inside a product enclosure, on a remote cable, or pointed in a specific direction for optimal coverage.

The ESP32-S3 processor provides dual Xtensa LX7 cores at 240 MHz, paired with a RISC-V ultra-low-power co-processor. Storage is 16 MB QSPI flash and 8 MB QSPI PSRAM via castellated edge pads, enabling direct SMT integration into custom PCBs. Two 700 mA 3.3V LDOs offer separated power domains; LDO2 is user-controlled and automatically shuts off during deep sleep for minimal standby current. A LiPo battery connector with JST-PicoBlade, VBAT and 5V sense pins, and USB Type-C with ESD and back-feed protection round out the power system.

With 27 GPIO pins on castellated headers, native USB Serial JTAG, a low-power RGB LED, and STEMMA QT connector, the ProS3 u.FL is a production-ready platform for prototyping through to deployment. UF2 bootloader, CircuitPython, Arduino 2.0.3+, MicroPython, and ESP-IDF are all supported.

## Where to Buy

- [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5749&ref=openhardware.directory&product=pros3-esp32-s3-ufl&source=md-export) — 29.95

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5749&ref=openhardware.directory&product=pros3-esp32-s3-ufl&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Funexpectedmaker%2Fesp32s3&ref=openhardware.directory&product=pros3-esp32-s3-ufl&source=md-export)

## Tags

`unexpected-maker`, `pros3`, `esp32-s3`, `ufl`, `external-antenna`, `castellated`, `psram`, `circuitpython`

## Images

![ProS3 ESP32-S3 with u.FL](https://nbg1.your-objectstorage.com/openhardware-directory/entities/pros3-esp32-s3-ufl/b746906587b0.jpg)
![ProS3 ESP32-S3 with u.FL](https://nbg1.your-objectstorage.com/openhardware-directory/entities/pros3-esp32-s3-ufl/d96ac80e1d40.jpg)

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