Franzininho WiFi Board
The Franzininho WiFi is an open hardware development board created in Brazil, based on the ESP32-S2 module. Its goal is to make WiFi-connected electronics projects more accessible to makers, students, and developers.
The board supports multiple programming environments — from visual blocks to native C — making it suitable for both beginners and experienced professionals.
Features
The Franzininho WiFi includes the following features:
- ESP32-S2 Module
- Xtensa® single-core 32-bit LX7 microcontroller, up to 240 MHz
- 128 KB ROM, 320 KB SRAM, 16 KB RTC SRAM, 4 MB Flash
- WiFi 802.11 b/g/n (no Bluetooth)
- Interfaces: GPIO, SPI, LCD, UART, I2C, I2S, camera, IR, pulse counter, LED PWM, TWAI (CAN), USB 1.1 OTG, ADC, DAC, touch, internal temperature sensor
- Pinout
- 40 pins in 2×20 headers, 2.54 mm pitch
- 35 GPIOs
- Breadboard-compatible
- 2 general-purpose LEDs
- Buttons: 1× Reset, 1× Boot
- USB: Micro USB connector — OTG 1.1 (no external USB-Serial chip)
- Power
- 5 V via USB connector
- 5 V and GND via pins
- 3.3 V and GND via pins
Pinout
Programming environments
The Franzininho WiFi can be programmed with the following environments and frameworks:
| Environment | Level | Documentation |
|---|---|---|
| Arduino | Beginner / Intermediate | Arduino Examples |
| CircuitPython | Beginner / Intermediate | CircuitPython Examples |
| MicroPython | Beginner / Intermediate | MicroPython Examples |
| ESP-IDF | Advanced | ESP-IDF Examples |
| Zephyr RTOS | Advanced | Official documentation |
| NuttX RTOS | Advanced | Official documentation |
Note: The ESP32-S2 does not have Bluetooth. If your project requires Bluetooth, consider using a board based on the ESP32 or ESP32-S3.
Simulation on Wokwi
Wokwi is a free online electronics simulator that supports the Franzininho WiFi. You can test projects without the physical board, with WiFi simulation, a virtual logic analyzer, and GDB debugging support.
Fritzing component
Fritzing is an open-source tool for documenting electronic circuits. We provide a Franzininho WiFi component to make it easier to create wiring diagrams for your projects.
License
The Franzininho WiFi is an open hardware project, licensed under the CERN Open Hardware License. The hardware project is available on GitHub: