# ESP32-S2 Saola 1R Dev Kit > Espressif official ESP32-S2-WROVER development board with dual 20-pin headers (breadboard-friendly), 8MB Flash, 2MB PSRAM, WiFi, dual Micro-USB (native USB + UART bridge), NeoPixel RGB LED, and boot/reset buttons. ## Quick Facts - **Brand:** Espressif - **Board Type:** dev-board - **Price:** ~$14.5 - **Product Readiness:** consumer - **CPU:** Xtensa LX7 single-core @ 240MHz (ESP32-S2) - **CPU Architecture:** Xtensa LX7 - **CPU Cores:** 1 - **RAM:** 320KB SRAM + 2MB PSRAM - **Flash:** 8MB SPI Flash - **Power:** 5V via Micro-USB - **Operating Voltage:** 3.3V - **Antenna:** Built-in PCB antenna ## Connectivity - **Wifi:** 802.11 b/g/n @ 2.4GHz (ESP32-S2 WROVER) - **Bluetooth:** false - **Zigbee:** false - **Ethernet:** false ## Open Source - **Firmware:** Yes - **Schematics:** Yes - **PCB Layout:** Yes ## Certifications RoHS, FCC, CE ## Compatible Firmware esp-idf, arduino, circuitpython, micropython ## Use Cases - iot - smart-home - wearable ## Components - **ESP32-S2** (mcu): Espressif ESP32-S2 single-core Xtensa LX7 @ 240MHz, 320KB SRAM, WiFi, native USB 1.1 OTG. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s2_datasheet_en.pdf&ref=openhardware.directory&product=esp32-s2-saola-1r-dev-kit&source=md-export) ## Protocols - **SPI**: MOSI: GPIO35, MISO: GPIO37, SCK: GPIO36 - **I2C**: SDA: GPIO8, SCL: GPIO9 - **UART**: TX: GPIO43, RX: GPIO44 - **I2S**: - **USB**: D-: GPIO19, D+: GPIO20 - **ADC**: - **DAC**: DAC1: GPIO17, DAC2: GPIO18 - **Touch**: - **PWM**: ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO1 | ADC1_CH0/Touch1 | ADC | ADC, Touch, GPIO | | GPIO2 | ADC1_CH1/Touch2 | ADC | ADC, Touch, GPIO | | GPIO3 | ADC1_CH2/Touch3/SDA | I2C | I2C, ADC, Touch, GPIO | | GPIO4 | ADC1_CH3/Touch4/SCL | I2C | I2C, ADC, Touch, GPIO | | GPIO5 | ADC1_CH4/Touch5 | ADC | ADC, Touch, GPIO | | GPIO6 | ADC1_CH5/Touch6 | ADC | ADC, Touch, GPIO | | GPIO7 | ADC1_CH6/Touch7 | ADC | ADC, Touch, GPIO | | GPIO8 | ADC1_CH7/Touch8 | ADC | ADC, Touch, GPIO | | GPIO9 | ADC1_CH8/Touch9 | ADC | ADC, Touch, GPIO | | GPIO10 | ADC1_CH9/Touch10 | ADC | ADC, Touch, GPIO | | GPIO11 | ADC2_CH0/Touch11 | ADC | ADC, Touch, GPIO | | GPIO12 | ADC2_CH1/Touch12 | ADC | ADC, Touch, GPIO | | GPIO13 | ADC2_CH2/Touch13 | ADC | ADC, Touch, GPIO | | GPIO14 | ADC2_CH3/Touch14 | ADC | ADC, Touch, GPIO | | GPIO15 | ADC2_CH4 | ADC | ADC, GPIO | | GPIO16 | ADC2_CH5 | ADC | ADC, GPIO | | GPIO17 | ADC2_CH6/DAC1 | DAC | DAC, ADC, GPIO | | GPIO18 | ADC2_CH7/DAC2 | DAC | DAC, ADC, GPIO | | GPIO19 | USB_D- | USB | USB, GPIO | | GPIO20 | USB_D+ | USB | USB, GPIO | | GPIO21 | GPIO | GPIO | GPIO | | GPIO35 | MOSI | SPI | SPI, GPIO | | GPIO36 | SCK | SPI | SPI, GPIO | | GPIO37 | MISO | SPI | SPI, GPIO | | GPIO43 | TX | UART | UART, GPIO | | GPIO44 | RX | UART | UART, GPIO | ## Available Software - **[esp-idf]()** (open-source) - **[arduino]()** (open-source) - **[circuitpython]()** (open-source) - **[micropython]()** (open-source) ## Description ## Overview The ESP32-S2 Saola 1R Dev Kit is Espressif's official reference development board for the ESP32-S2-WROVER module. It exposes nearly all available I/O pins through dual 20-pin headers, making the board narrowly breadboard-mountable (side-by-side with another board) while providing access to the ESP32-S2's full peripheral set for rapid prototyping and evaluation. The WROVER module onboard includes an ESP32-S2 single-core Xtensa LX7 at up to 240MHz, 8MB of SPI Flash, and 2MB of PSRAM — more storage than the bare module sold separately. Two Micro-USB ports are provided: one for native USB access directly to the ESP32-S2's built-in USB 1.1 OTG peripheral (GPIO19/20), and one connected to a CP210x USB-to-UART bridge for ESP-IDF serial programming and debugging. A NeoPixel-compatible RGB addressable LED, power indicator LED, and 3.3V voltage regulator complete the board. Boot and reset buttons enable the standard ESP32 firmware flashing procedure without requiring additional tools. Multiple power input options are available: 5V via either Micro-USB connector, or 5V and 3.3V through header pins, giving flexibility for battery-powered and regulated-supply designs. The board is compatible with ESP-IDF v4.2+, CircuitPython, MicroPython, and Arduino via the arduino-esp32 library. The Saola 1R replaced the larger and more complex Kaluga development kit as Espressif's recommended entry point for ESP32-S2 evaluation. Espressif provides full schematics, PCB design files, and comprehensive documentation through the official ESP-IDF documentation portal. ## Where to Buy - [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F4693&ref=openhardware.directory&product=esp32-s2-saola-1r-dev-kit&source=md-export) — 14.5 ## Resources - [product page](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F4693&ref=openhardware.directory&product=esp32-s2-saola-1r-dev-kit&source=md-export) - [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F4693&ref=openhardware.directory&product=esp32-s2-saola-1r-dev-kit&source=md-export) - [documentation](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.espressif.com%2Fprojects%2Fesp-idf%2Fen%2Flatest%2Fesp32s2%2Fhw-reference%2Fesp32s2%2Fuser-guide-saola-1-v1.2.html&ref=openhardware.directory&product=esp32-s2-saola-1r-dev-kit&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fespressif%2Fesp-idf&ref=openhardware.directory&product=esp32-s2-saola-1r-dev-kit&source=md-export) ## Tags `esp32-s2`, `dev-kit`, `wifi`, `espressif`, `psram`, `circuitpython`, `usb-otg`, `breadboard` ## Images ![ESP32-S2 Saola 1R Dev Kit](https://nbg1.your-objectstorage.com/openhardware-directory/entities/esp32-s2-saola-1r-dev-kit/1a0262d95885.jpg) ![ESP32-S2 Saola 1R Dev Kit](https://nbg1.your-objectstorage.com/openhardware-directory/entities/esp32-s2-saola-1r-dev-kit/7fb043dc02eb.jpg) ![ESP32-S2 Saola 1R Dev Kit](https://nbg1.your-objectstorage.com/openhardware-directory/entities/esp32-s2-saola-1r-dev-kit/7d9f1aa89c24.jpg) --- [View full device page](https://openhardware.directory/devices/esp32-s2-saola-1r-dev-kit)