Luís Carlos.pt
World's Smallest ESP32 V2 board with its OLED screen, plugged into a USB cable

LC-ESP32-V2REV 2021Electronics

World's Smallest ESP32 V2

The second version of the world's smallest ESP32: 15 × 21 × 4 mm with sensors, an IMU and a 64 × 32 OLED screen.

Read the datasheet

3Detailed description

This is the second version of the smallest ESP32 in the world (the first one is here).

This time I increased its size from 10 × 10 × 10 mm to 15 × 21 × 4 mm — but don’t get me wrong, it is still the smallest ESP32 ever, apart from my first version of course.

This time the circuit is made of 4 stacked PCBs instead of the 6 of the first version, and it has the following features:

  • Micro USB
  • DC-DC converter with current capacity up to 1 A
  • FTDI chip for USB-UART conversion
  • ESP32-PICO-D4 MCU
  • 4 buttons (1 reset + 3 multi-purpose)
  • 2.2 dBi antenna for Wi-Fi and Bluetooth
  • Connector for an external antenna, with signal pass-through
  • 16 pads at 2.54 mm pitch for GPIO / power
  • Temperature sensor
  • Air pressure sensor
  • Humidity sensor
  • Gas air-quality sensor (VOC)
  • 3-axis gyroscope and accelerometer
  • 64 × 32 OLED screen

4Figures12 figures · tap to enlarge

V2 plugged into USB, OLED showing “Movimento Maker”
Fig. 1
Top view of the OLED and connector
Fig. 2
Top view, rotated, with the antenna connector
Fig. 3
The bottom side with the 2.54 mm GPIO pads
Fig. 4
V2 on the palm of a hand
Fig. 5
Top view of the board without the display
Fig. 6
Another angle of V2 plugged into USB
Fig. 7
Side view showing the 4 stacked PCBs
Fig. 8
Held between two fingers
Fig. 9
V2 on a hand, plugged into USB
Fig. 10
Close-up held in the hand
Fig. 11
Next to a 2 € coin for scale
Fig. 12

Fig. 101 / 12

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