Design with WEMOS LOLIN32 OLED in Cirkit DesignerThe WEMOS LOLIN32 OLED is a versatile and powerful development board that combines the advanced features of the ESP32 microcontroller with the convenience of an integrated OLED display. This board is ideal for IoT projects, wearable devices, and any application where visual feedback is beneficial. With built-in Wi-Fi and Bluetooth capabilities, the WEMOS LOLIN32 OLED is perfect for creating connected devices.
This is a microcontroller-based interactive device featuring a Wemos D1 Mini, an OLED display, external EEPROM, and an I/O expander. It includes user input buttons and status LEDs, with potential MIDI interface capabilities.
Open Project in Cirkit Designer
This circuit features an ESP8266 microcontroller interfaced with a 128x64 OLED display via I2C for visual output and an RGB LED controlled through current-limiting resistors. The ESP8266 provides power and control signals to both the display and the LED, enabling visual feedback and status indication.
Open Project in Cirkit Designer
This circuit features an ESP8266 NodeMCU microcontroller connected to a 0.96" OLED display and an RYLR896 LoRa module. The ESP8266 communicates with the OLED via I2C protocol and interfaces with the LoRa module using UART, enabling wireless data transmission and display capabilities.
Open Project in Cirkit Designer
This circuit features an ESP32 microcontroller powered by a single 18650 battery, which drives a 0.96" OLED display. The ESP32 communicates with the OLED via I2C protocol, using GPIO21 and GPIO22 as SDA and SCL lines, respectively. The purpose of the circuit is to display the message 'Hello, World!' on the OLED screen.
Open Project in Cirkit Designer| Pin Number | Function | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | 3V3 | 3.3V power supply |
| 3 | EN | Reset pin, active low |
| 4 | VP | 36, ADC, Capacitive touch |
| 5 | VN | 39, ADC, Capacitive touch |
| 6 | IO34 | 34, ADC |
| 7 | IO35 | 35, ADC |
| 8 | IO32 | 32, ADC, DAC, Capacitive touch |
| 9 | IO33 | 33, ADC, DAC, Capacitive touch |
| 10 | IO25 | 25, ADC, DAC |
| 11 | IO26 | 26, ADC, DAC |
| 12 | IO27 | 27, ADC, Capacitive touch |
| 13 | IO14 | 14, ADC, Capacitive touch, SPI |
| 14 | IO12 | 12, ADC, Capacitive touch, SPI |
| 15 | IO13 | 13, ADC, Capacitive touch, SPI |
| 16 | IO9 | 9, SPI |
| 17 | IO10 | 10, SPI |
| 18 | IO11 | 11, SPI |
| 19 | IO6 | 6, SPI |
| 20 | IO7 | 7, SPI |
| 21 | IO8 | 8, SPI |
| 22 | IO23 | 23, SPI |
| 23 | IO22 | 22, I2C |
| 24 | TX0 | UART |
| 25 | RX0 | UART |
| 26 | IO5 | 5, SPI |
| 27 | IO18 | 18, SPI |
| 28 | IO19 | 19, SPI |
| 29 | IO21 | 21, I2C |
| 30 | GND | Ground |
| 31 | 5V | 5V power supply via USB |
Powering the Board:
Connecting to the OLED Display:
Programming the Board:
Board not recognized by the computer:
OLED display not working:
Difficulty uploading sketches:
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
// OLED display TWI address
#define OLED_ADDR 0x3C
// Reset pin not used on 4-pin OLED module
Adafruit_SSD1306 display(-1);
// Initialize with the I2C addr 0x3C (for the 128x64)
// Always reset the display at the beginning
void setup() {
Wire.begin(5, 4); // Initialize I2C
display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
display.display();
delay(2000); // Pause for 2 seconds
display.clearDisplay();
}
void loop() {
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0,0);
display.println(F("Hello, world!"));
display.display();
delay(2000);
display.clearDisplay();
}
Note: This example assumes the use of the Adafruit SSD1306 library for the OLED display. Ensure that the library is installed in the Arduino IDE before compiling and uploading the sketch. The I2C pins are defined as GPIO 5 (SDA) and GPIO 4 (SCL) in the Wire.begin(5, 4); statement. Adjust these pin numbers if your board uses different pins for I2C communication.