Wemos S2 Mini ESP32-S2

This S2 Mini is equipped with an ESP32-S2 chip. It has a clock speed of no less than 240Mhz. It also has integrated WiFi. Thanks to the smart layout of this board, it is the same size as the D1 Mini but has 2x as many pins.

Processor: ESP32-S2FN4R2
Clock speed: 240Mhz
Number of pins: 32
Number of GPIO pins: 27
Number of PWM pins: 27 (maximum 8 at the same time)
Number of analog input pins (ADC): 18
Number of analog output pins (DAC): 2
ROM: 128kB
SRAM: 320kB
PDRAM: 2MB
Flash memory: 4MB
USB to serial converter: yes, internal
Pin spacing: 2.54mm
USB connection: USB-C

Header pins are included but still need to be soldered.

Installing Wemos S2 Mini in Arduino IDE

1. Install Arduino IDE software (www.arduino.cc)
2. In Arduino IDE, go to FILE and then to PREFERENCES.
3. Under MORE BOARD MANAGER URLS, enter the following URL: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json (if there is already a URL there for example for the ESP8266 boards, add this URL with a comma in between.
4. Now go to TOOLS, BOARD and BOARD MANAGER
5. Find the correct library (ESP32 by Espressif Systems) and install it (this only needs to be done once)
6. Select the board LOLIN S2 Mini in the list under TOOLS, BOARD
7. Set the upload speed to 115200 baud
8. Set the port to the correct COM port.

Wemos S2 Mini no COM port

To activate the S2 Mini, hold down both the 0 and RST buttons at the same time. The S2 Mini will now be recognized. Release the buttons and the S2 Mini can be programmed with the Arduino IDE

Dimensions
Length: 3,45cm
Width: 2,52cm
Height: 0,44cm