ESP32-WROOM-32 Development Board with 0.96" OLED Display & Battery Interface

Specifications

• Microcontroller: ESP32-WROOM-32 (Wi-Fi & Bluetooth)

• Display: 0.96-inch OLED (128x64 Resolution)

• Display Driver: SSD1306

• I2C Mapping: SDA = GPIO21, SCL = GPIO22 (Address: 0x3C)

• USB-to-Serial Chip: CH340C

• USB Interface: Micro USB

• Battery Interface: 3.7V Lithium Battery Port (1.25mm Pitch)

• Dimensions: 64.8mm (L) x 28.6mm (W)

Key Applications and Projects

• Desktop Crypto Ticker: Connect the board to your Wi-Fi network and fetch real-time API data to display live cryptocurrency or stock market prices right on your desk.

• Portable Environmental Monitor: Attach an external BME280 temperature and humidity sensor via the remaining GPIO pins and power the board via a LiPo battery for a handheld weather station.

• Smart Network Scanner: Program the ESP32 to scan for local Wi-Fi networks or Bluetooth LE beacons and output the signal strengths (RSSI) graphically onto the OLED screen.

Unlock New Capabilities (Project Evolution) The Custom Smartwatch Node: Take advantage of the board's integrated display, battery connector, and capacitive touch pins! The ESP32 pinout provides several RTCIO pins capable of detecting capacitive touch. You can design a 3D-printed watch casing for the 64.8mm x 28.6mm board, hook up a tiny LiPo battery, and use conductive copper tape on the housing wired to the touch pins. You have just built a custom smartwatch with touch-based menu navigation and a bright OLED interface!

PACKAGE INCLUDED

• 1 x ESP32 CH340 0.96 OLED Development Board (Model HW-454B)

• Note: Board features pre-soldered male header pins

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What is the main microcontroller module on this board? The board is powered by the ESP32-WROOM-32 module.

2. What is the size of the integrated display? The board features a built-in 0.96-inch OLED display.

3. What is the resolution of the OLED screen? The OLED screen has a resolution of 128x64 pixels.

4. Which display driver chip does the OLED use? The screen utilizes the popular SSD1306 driver architecture.

5. How is the OLED wired to the ESP32? The OLED uses the I2C protocol. The SDA line is connected to GPIO21, and the SCL line is connected to GPIO22.

6. What is the default I2C address for the display? The default I2C address is 0x3C.

7. Does the board support battery power? Yes, it has a dedicated Lithium Battery Interface on the back, rated for 3.7V.

8. What kind of connector is used for the battery? It uses a 2-pin connector with a 1.25mm pitch.

9. How do I program this board? You connect it to your computer using the onboard Micro USB port.

10. What USB-to-Serial converter chip is used? The board relies on the CH340C chip for USB-to-Serial communication.

11. What are the exact physical dimensions of the board? The board measures 64.8mm in length and 28.6mm in width.

12. Does the board have mounting holes? Yes, there are four positioning holes with a diameter of 3.3mm.

13. What is the spacing between the mounting holes? The horizontal distance between hole centers is 54.3mm, and the vertical distance is 20.7mm.

14. What are the two physical buttons next to the USB port? They are the BOOT button (for entering flash mode) and the EN button (for resetting or enabling the board).

15. Does this module support Wi-Fi and Bluetooth? Yes, the ESP32-WROOM-32 module includes built-in Wi-Fi and Bluetooth SOC functionality.

16. What is the model number printed on the board? The model number printed on the front silkscreen is HW-454B.

17. Do I need to solder the header pins? No, this version comes with the male header pins pre-soldered to the board.

18. Are all GPIO pins capable of both input and output? No, certain pins are designated as "Input Only," such as GPIO34, GPIO35, GPIO36, and GPIO39, as indicated by the pin definition diagram.

19. Can I use capacitive touch with this board? Yes, the pinout breaks out several RTCIO pins that support native capacitive touch sensing.

20. What is displayed on the screen when first powered on? By default, the screen displays a demo showing "ESP32 12864 OLED", the I2C Address 0x3C, and the pin mappings for SDA and SCL.