# ProS3[D] ESP32-S3 by Unexpected Maker > The ProS3[D] is Unexpected Maker's flagship ESP32-S3 development board featuring a dual antenna system (onboard 3D high-gain + u.FL for external), an I2C battery fuel gauge, 16MB flash, 8MB PSRAM, dual 700mA LDOs, and STEMMA QT — with software-switchable RF routing. ## Quick Facts - **Brand:** Unexpected Maker - **Board Type:** ESP32-S3 - **Price:** ~$26.5 - **Product Readiness:** developer - **CPU:** Xtensa LX7 dual-core @ 240MHz, FPU, AI vector extensions, HW crypto (AES/SHA/RSA) - **CPU Architecture:** Xtensa LX7 dual-core - **CPU Cores:** 2 - **RAM:** 512KB SRAM + 8MB PSRAM - **PSRAM:** 8MB QSPI - **Flash:** 16MB - **USB:** USB-C (native USB + USB Serial JTAG) - **Power:** USB-C 5V or LiPo battery - **Operating Voltage:** 3.3V GPIO - **Antenna:** u.FL + onboard PCB antenna (switchable) ## Connectivity - **Wifi:** 2.4GHz 802.11 b/g/n - **Bluetooth:** Bluetooth 5 LE + Mesh ## Open Source - **Firmware:** Yes - **Schematics:** Yes - **PCB Layout:** Yes ## Certifications CE, FCC, RoHS ## Compatible Firmware circuitpython, micropython, arduino, esp-idf ## Use Cases - iot - prototyping - smart-home - iot-gateway ## Components - **ESP32-S3** (mcu): Dual-core Xtensa LX7 at 240MHz with AI vector extensions, WiFi 802.11 b/g/n, Bluetooth 5 LE+Mesh, and native USB OTG. — [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=pros3d-esp32-s3&source=md-export) - **8MB PSRAM** (memory): External 8MB QSPI pseudo-static RAM providing expanded working memory for large datasets and ML inference. — [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=pros3d-esp32-s3&source=md-export) - **I2C Battery Fuel Gauge** (sensor): Dedicated I2C fuel gauge IC for accurate LiPo battery state-of-charge monitoring. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fesp32s3.com%2Fpros3.html&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export) - **RF Switch** (chip): Software-controlled RF switch allowing runtime selection between the onboard 3D high-gain antenna and the u.FL external antenna connector. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fesp32s3.com%2Fpros3.html&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export) - **RGB LED** (led): Built-in addressable RGB LED for status indication and user feedback. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fcdn-shop.adafruit.com%2Fdatasheets%2FWS2812B.pdf&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export) ## Protocols - **I2C**: SDA: GPIO21, SCL: GPIO38 - **SPI**: MOSI: GPIO35, MISO: GPIO36, SCK: GPIO37 - **UART**: TX: GPIO33, RX: GPIO34 - **PWM** ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO1 | ADC1_CH0 | GPIO | analog, digital | | GPIO2 | ADC1_CH1 | GPIO | analog, digital | | GPIO3 | ADC1_CH2 | GPIO | analog, digital | | GPIO4 | ADC1_CH3 | GPIO | analog, digital | | GPIO5 | ADC1_CH4 | GPIO | analog, digital | | GPIO6 | ADC1_CH5 | GPIO | analog, digital | | GPIO7 | ADC1_CH6 | GPIO | analog, digital | | GPIO8 | GPIO8 | GPIO | digital | | GPIO9 | GPIO9 | GPIO | digital | | GPIO10 | GPIO10 | GPIO | digital | | GPIO11 | GPIO11 | GPIO | digital | | GPIO12 | GPIO12 | GPIO | digital | | GPIO13 | GPIO13 | GPIO | digital | | GPIO14 | GPIO14 | GPIO | digital | | GPIO15 | GPIO15 | GPIO | digital | | GPIO16 | GPIO16 | GPIO | digital | | GPIO17 | GPIO17 | GPIO | digital | | GPIO18 | GPIO18 | GPIO | digital | | GPIO21 | SDA | I2C | i2c-sda, digital | | GPIO26 | GPIO26 | GPIO | digital | | GPIO33 | TX | UART | uart-tx, digital | | GPIO34 | RX | UART | uart-rx, digital | | GPIO35 | MOSI | SPI | spi-mosi, digital | | GPIO36 | MISO | SPI | spi-miso, digital | | GPIO37 | SCK | SPI | spi-sck, digital | | GPIO38 | SCL | I2C | i2c-scl, digital | ## Available Software - **[CircuitPython](https://openhardware.directory/r?to=https%3A%2F%2Fcircuitpython.org%2Fboard%2Funexpectedmaker_pros3%2F&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export)** - **[Getting Started Guide](https://openhardware.directory/r?to=https%3A%2F%2Fesp32s3.com%2Fpros3.html&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export)** ## Description ## Overview The ProS3[D] is Unexpected Maker's most powerful ESP32-S3 board, designed as a professional-grade platform for advanced IoT and embedded applications. The "[D]" designation marks this as the enhanced dual-antenna variant: the board carries both a 3D high-gain onboard antenna and a u.FL connector for an external antenna, with a software-controlled RF switch that lets developers toggle between them at runtime. The onboard antenna is selected by default, protecting the radio from damage if no external antenna is attached. Internally, the ProS3[D] pairs the ESP32-S3's dual-core Xtensa LX7 at 240MHz with 16MB of QSPI flash and 8MB of PSRAM, providing ample storage and dynamic memory for demanding applications including large CircuitPython libraries, local machine learning inference, and complex data pipelines. Two 700mA 3.3V LDO regulators in parallel supply clean power to peripherals, and a dedicated I2C battery fuel gauge enables accurate state-of-charge monitoring for LiPo-powered designs. The MicroBlade-standard battery connector provides secure polarity-protected battery attachment. With 27 GPIO pins broken out on castellated headers, the ProS3[D] can be embedded directly into custom PCBs as a stamp-style module. A STEMMA QT / Qwiic connector enables daisy-chaining of I2C sensors without soldering. The board includes a USB-C connector with ESD and reverse back-feed protection, hardware USB Serial JTAG for debugging, and a built-in RGB LED for status indication. Power options include USB-C, LiPo battery, or an external regulated supply via the 3V3 or VSYS pins. The ProS3[D] ships with CircuitPython and supports Arduino (2.0.3+), ESP-IDF, and MicroPython. Unexpected Maker provides open-source schematics and PCB files on GitHub, and comprehensive getting-started documentation at esp32s3.com. ## Where to Buy - [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F6398&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export) — $26.50 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F6398&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Funexpectedmaker%2Fesp32s3&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fesp32s3.com%2Fpros3.html&ref=openhardware.directory&product=pros3d-esp32-s3&source=md-export) ## Tags `unexpected-maker`, `esp32-s3`, `pros3`, `dual-antenna`, `psram`, `circuitpython`, `wifi`, `ble`, `iot`, `ufl` ## Images ![ProS3[D] ESP32-S3 by Unexpected Maker](https://nbg1.your-objectstorage.com/openhardware-directory/entities/pros3d-esp32-s3/4d1e06b24b41.jpg) ![ProS3[D] ESP32-S3 by Unexpected Maker](https://nbg1.your-objectstorage.com/openhardware-directory/entities/pros3d-esp32-s3/fed76c3ab748.jpg) ![ProS3[D] ESP32-S3 by Unexpected Maker](https://nbg1.your-objectstorage.com/openhardware-directory/entities/pros3d-esp32-s3/31ab5d81e622.jpg) --- [View full device page](https://openhardware.directory/devices/pros3d-esp32-s3)