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ESP32 OLED Module for WiFi and Bluetooth
The ESP32 OLED Module is a compact microcontroller development board that integrates a 32-bit dual-core processor with built-in WiFi 802.11 b/g/n and Bluetooth 4.2 connectivity, paired with a 0.96-inch OLED display for real-time data visualization. IoT developers, embedded systems engineers, and hardware hobbyists use this module to rapidly prototype connected applications that require wireless communication and local display capabilities without additional peripherals. This product solves the challenge of building WiFi and Bluetooth-enabled projects with integrated visual feedback, eliminating the need for separate display modules and reducing circuit complexity.
Product Overview
The ESP32 OLED Module combines Espressif's powerful ESP32 System-on-Chip with a 128x64 pixel monochrome OLED display, creating an all-in-one solution for IoT and embedded applications. The dual-core Xtensa 32-bit processor operates at 160-240 MHz with 520 KB of SRAM and 4 MB of flash memory, providing sufficient computational power for complex wireless protocols and sensor data processing. The integrated OLED display communicates via I2C interface, allowing developers to display sensor readings, network status, system diagnostics, and user interfaces directly on the module without additional wiring or external display drivers.
The module features independent WiFi and Bluetooth subsystems that operate simultaneously, enabling dual-mode connectivity for applications requiring both long-range network access and short-range peripheral communication. The onboard voltage regulator supports 5V input with internal 3.3V regulation, while the module includes 34 GPIO pins with support for SPI, I2C, UART, ADC, DAC, and PWM functions. The OLED display operates at 3.3V with adjustable brightness and contrast, making it ideal for battery-powered applications where power consumption optimization is critical.
Key Specifications
| Specification | Details |
| Product Type | ESP32 Microcontroller with Integrated OLED Display Module |
| Brand | Generic ESP32 (Espressif chipset) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Processor | Dual-core Xtensa 32-bit @ 160-240 MHz |
| RAM | 520 KB SRAM |
| Flash Memory | 4 MB |
| OLED Display | 0.96-inch, 128x64 pixels, I2C interface |
| Wireless Connectivity | WiFi 802.11 b/g/n, Bluetooth 4.2 (simultaneous dual-mode) |
| GPIO Pins | 34 pins with SPI, I2C, UART, ADC, DAC, PWM support |
| Operating Voltage | 5V input, 3.3V internal regulation |
| Board Dimensions | Approximately 55mm x 25mm |
Key Features
- Integrated 0.96-inch OLED Display: 128x64 pixel monochrome display with I2C control eliminates need for external display modules, saving GPIO pins and reducing circuit complexity for data visualization applications
- Dual-Core Processing: 160-240 MHz dual-core Xtensa processor with 520 KB SRAM enables multitasking for simultaneous WiFi communication, Bluetooth operations, and local processing without performance degradation
- Simultaneous WiFi and Bluetooth: Independent wireless subsystems allow concurrent WiFi connectivity for cloud communication and Bluetooth for peripheral device pairing without protocol conflicts or switching delays
- Rich GPIO Functionality: 34 GPIO pins supporting SPI, I2C, UART, ADC, DAC, and PWM enable direct integration with sensors, actuators, and external modules without additional interface boards
- Low Power Design: Integrated voltage regulator with sleep modes consuming as low as 10 microamps in deep sleep, ideal for battery-powered IoT devices and remote monitoring applications
- Pre-soldered Headers: Ready-to-use with standard 2.54mm pin headers for breadboard prototyping, eliminating soldering requirements and accelerating project development timelines
Applications and Use Cases
- Smart Home Monitoring Devices: Build WiFi-enabled temperature and humidity sensors with local OLED display for room status, connecting to home automation hubs via WiFi while displaying real-time readings without network dependency
- Bluetooth Fitness Trackers: Develop wearable devices that sync health metrics via Bluetooth to smartphones while displaying current heart rate, steps, and calories on the integrated OLED screen for immediate user feedback
- IoT Data Logging Stations: Create environmental monitoring systems that collect sensor data via ADC inputs, display readings on OLED, and transmit to cloud servers via WiFi for long-term analytics and remote access
- Wireless Control Interfaces: Design portable control panels with OLED menu systems for remote device management, using Bluetooth for nearby equipment control and WiFi for internet-connected appliances and systems
- Educational Robotics Projects: Implement robot vision systems with WiFi camera streaming and Bluetooth motor control, using OLED for status display and debugging information during autonomous navigation tasks
- Industrial Equipment Monitoring: Deploy predictive maintenance sensors that monitor machinery vibration and temperature via ADC, display alerts on OLED, and report anomalies to cloud dashboards via WiFi for condition-based maintenance
How to Use
Begin by installing the ESP32 board support package in the Arduino IDE by adding the Espressif board manager URL (https://dl.espressif.com/dl/package_esp32_index.json) to preferences, then selecting the ESP32 Dev Module from the boards menu. Connect the module to your computer via USB-C or micro-USB cable, select the appropriate COM port, and verify the connection using the blink example sketch. The OLED display communicates via I2C on GPIO 21 (SDA) and GPIO 22 (SCL) by default; use the Adafruit SSD1306 library to initialize and control the display with simple commands like display.println() for text rendering and display.drawPixel() for graphics.
For WiFi connectivity, use the built-in WiFi.h library to scan networks, establish connections, and manage SSID/password credentials through EEPROM or hardcoded values. For Bluetooth applications, implement the BluetoothSerial library to create serial communication profiles for smartphone apps or wireless peripherals. Combine both wireless protocols by running WiFi in station mode while simultaneously advertising Bluetooth services; the dual-core processor handles both stacks independently. Always configure GPIO pins as INPUT or OUTPUT using pinMode() before reading or writing values, and use analogRead() for ADC inputs (pins 32-39) to acquire sensor data with 12-bit resolution at up to 1 MSPS sampling rate.
Frequently Asked Questions
Can the ESP32 OLED Module run WiFi and Bluetooth simultaneously without performance loss?
Yes, the dual-core architecture with independent wireless subsystems allows simultaneous WiFi and Bluetooth operation without interference or performance degradation. One core can handle WiFi stack operations while the second core manages Bluetooth communication, sensor reading, and OLED display updates concurrently. However, intensive processing on both cores simultaneously may require task prioritization using FreeRTOS to prevent watchdog timer resets.
What is the maximum range for WiFi and Bluetooth connectivity on this module?
WiFi 802.11n typically achieves 100-150 meters in open space with line-of-sight, reducing to 30-50 meters through walls and obstacles depending on antenna orientation and environmental interference. Bluetooth 4.2 provides approximately 50-240 meters range in open space, but practical range is typically 10-30 meters indoors due to wall attenuation and interference from 2.4 GHz devices like microwave ovens and cordless phones.
How do I update the firmware or bootloader on the ESP32 OLED Module?
Firmware updates are performed through the Arduino IDE using the standard upload process via USB connection. The bootloader is pre-flashed and typically does not require updates unless you encounter specific compatibility issues. For advanced bootloader modifications, use esptool.py command-line utility with the --chip esp32 parameter and appropriate binary files from Espressif repositories.
Can I use the OLED display with custom fonts and graphics libraries?
Yes, the Adafruit SSD1306 library supports custom fonts through the GFXfont format, and you can implement bitmap graphics using drawBitmap() function. For advanced graphics, consider using the U8g2 library which provides more display options, font selections, and animation capabilities. Both libraries are compatible with the ESP32 platform and consume minimal memory overhead.
What are the power consumption specifications for different operating modes?
Active WiFi transmission consumes approximately 80-160 mA depending on transmission power, active Bluetooth operations consume 10-50 mA, and the OLED display adds 5-10 mA. In idle mode with WiFi and Bluetooth inactive, consumption is around 10 mA. Deep sleep mode with RTC memory retention consumes as low as 10 microamps, making the module suitable for battery-powered applications with periodic wake intervals.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
Buy ESP32 OLED Module for WiFi and Bluetooth Online in India
Purchase the ESP32 OLED Module for WiFi and Bluetooth online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.
ESP32 OLED Module for WiFi and Bluetooth
The ESP32 OLED Module is a compact microcontroller development board that integrates a 32-bit dual-core processor with built-in WiFi 802.11 b/g/n and Bluetooth 4.2 connectivity, paired with a 0.96-inch OLED display for real-time data visualization. IoT developers, embedded systems engineers, and hardware hobbyists use this module to rapidly prototype connected applications that require wireless communication and local display capabilities without additional peripherals. This product solves the challenge of building WiFi and Bluetooth-enabled projects with integrated visual feedback, eliminating the need for separate display modules and reducing circuit complexity.
Product Overview
The ESP32 OLED Module combines Espressif's powerful ESP32 System-on-Chip with a 128x64 pixel monochrome OLED display, creating an all-in-one solution for IoT and embedded applications. The dual-core Xtensa 32-bit processor operates at 160-240 MHz with 520 KB of SRAM and 4 MB of flash memory, providing sufficient computational power for complex wireless protocols and sensor data processing. The integrated OLED display communicates via I2C interface, allowing developers to display sensor readings, network status, system diagnostics, and user interfaces directly on the module without additional wiring or external display drivers.
The module features independent WiFi and Bluetooth subsystems that operate simultaneously, enabling dual-mode connectivity for applications requiring both long-range network access and short-range peripheral communication. The onboard voltage regulator supports 5V input with internal 3.3V regulation, while the module includes 34 GPIO pins with support for SPI, I2C, UART, ADC, DAC, and PWM functions. The OLED display operates at 3.3V with adjustable brightness and contrast, making it ideal for battery-powered applications where power consumption optimization is critical.
Key Specifications
| Specification | Details |
| Product Type | ESP32 Microcontroller with Integrated OLED Display Module |
| Brand | Generic ESP32 (Espressif chipset) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Processor | Dual-core Xtensa 32-bit @ 160-240 MHz |
| RAM | 520 KB SRAM |
| Flash Memory | 4 MB |
| OLED Display | 0.96-inch, 128x64 pixels, I2C interface |
| Wireless Connectivity | WiFi 802.11 b/g/n, Bluetooth 4.2 (simultaneous dual-mode) |
| GPIO Pins | 34 pins with SPI, I2C, UART, ADC, DAC, PWM support |
| Operating Voltage | 5V input, 3.3V internal regulation |
| Board Dimensions | Approximately 55mm x 25mm |
Key Features
- Integrated 0.96-inch OLED Display: 128x64 pixel monochrome display with I2C control eliminates need for external display modules, saving GPIO pins and reducing circuit complexity for data visualization applications
- Dual-Core Processing: 160-240 MHz dual-core Xtensa processor with 520 KB SRAM enables multitasking for simultaneous WiFi communication, Bluetooth operations, and local processing without performance degradation
- Simultaneous WiFi and Bluetooth: Independent wireless subsystems allow concurrent WiFi connectivity for cloud communication and Bluetooth for peripheral device pairing without protocol conflicts or switching delays
- Rich GPIO Functionality: 34 GPIO pins supporting SPI, I2C, UART, ADC, DAC, and PWM enable direct integration with sensors, actuators, and external modules without additional interface boards
- Low Power Design: Integrated voltage regulator with sleep modes consuming as low as 10 microamps in deep sleep, ideal for battery-powered IoT devices and remote monitoring applications
- Pre-soldered Headers: Ready-to-use with standard 2.54mm pin headers for breadboard prototyping, eliminating soldering requirements and accelerating project development timelines
Applications and Use Cases
- Smart Home Monitoring Devices: Build WiFi-enabled temperature and humidity sensors with local OLED display for room status, connecting to home automation hubs via WiFi while displaying real-time readings without network dependency
- Bluetooth Fitness Trackers: Develop wearable devices that sync health metrics via Bluetooth to smartphones while displaying current heart rate, steps, and calories on the integrated OLED screen for immediate user feedback
- IoT Data Logging Stations: Create environmental monitoring systems that collect sensor data via ADC inputs, display readings on OLED, and transmit to cloud servers via WiFi for long-term analytics and remote access
- Wireless Control Interfaces: Design portable control panels with OLED menu systems for remote device management, using Bluetooth for nearby equipment control and WiFi for internet-connected appliances and systems
- Educational Robotics Projects: Implement robot vision systems with WiFi camera streaming and Bluetooth motor control, using OLED for status display and debugging information during autonomous navigation tasks
- Industrial Equipment Monitoring: Deploy predictive maintenance sensors that monitor machinery vibration and temperature via ADC, display alerts on OLED, and report anomalies to cloud dashboards via WiFi for condition-based maintenance
How to Use
Begin by installing the ESP32 board support package in the Arduino IDE by adding the Espressif board manager URL (https://dl.espressif.com/dl/package_esp32_index.json) to preferences, then selecting the ESP32 Dev Module from the boards menu. Connect the module to your computer via USB-C or micro-USB cable, select the appropriate COM port, and verify the connection using the blink example sketch. The OLED display communicates via I2C on GPIO 21 (SDA) and GPIO 22 (SCL) by default; use the Adafruit SSD1306 library to initialize and control the display with simple commands like display.println() for text rendering and display.drawPixel() for graphics.
For WiFi connectivity, use the built-in WiFi.h library to scan networks, establish connections, and manage SSID/password credentials through EEPROM or hardcoded values. For Bluetooth applications, implement the BluetoothSerial library to create serial communication profiles for smartphone apps or wireless peripherals. Combine both wireless protocols by running WiFi in station mode while simultaneously advertising Bluetooth services; the dual-core processor handles both stacks independently. Always configure GPIO pins as INPUT or OUTPUT using pinMode() before reading or writing values, and use analogRead() for ADC inputs (pins 32-39) to acquire sensor data with 12-bit resolution at up to 1 MSPS sampling rate.
Frequently Asked Questions
Can the ESP32 OLED Module run WiFi and Bluetooth simultaneously without performance loss?
Yes, the dual-core architecture with independent wireless subsystems allows simultaneous WiFi and Bluetooth operation without interference or performance degradation. One core can handle WiFi stack operations while the second core manages Bluetooth communication, sensor reading, and OLED display updates concurrently. However, intensive processing on both cores simultaneously may require task prioritization using FreeRTOS to prevent watchdog timer resets.
What is the maximum range for WiFi and Bluetooth connectivity on this module?
WiFi 802.11n typically achieves 100-150 meters in open space with line-of-sight, reducing to 30-50 meters through walls and obstacles depending on antenna orientation and environmental interference. Bluetooth 4.2 provides approximately 50-240 meters range in open space, but practical range is typically 10-30 meters indoors due to wall attenuation and interference from 2.4 GHz devices like microwave ovens and cordless phones.
How do I update the firmware or bootloader on the ESP32 OLED Module?
Firmware updates are performed through the Arduino IDE using the standard upload process via USB connection. The bootloader is pre-flashed and typically does not require updates unless you encounter specific compatibility issues. For advanced bootloader modifications, use esptool.py command-line utility with the --chip esp32 parameter and appropriate binary files from Espressif repositories.
Can I use the OLED display with custom fonts and graphics libraries?
Yes, the Adafruit SSD1306 library supports custom fonts through the GFXfont format, and you can implement bitmap graphics using drawBitmap() function. For advanced graphics, consider using the U8g2 library which provides more display options, font selections, and animation capabilities. Both libraries are compatible with the ESP32 platform and consume minimal memory overhead.
What are the power consumption specifications for different operating modes?
Active WiFi transmission consumes approximately 80-160 mA depending on transmission power, active Bluetooth operations consume 10-50 mA, and the OLED display adds 5-10 mA. In idle mode with WiFi and Bluetooth inactive, consumption is around 10 mA. Deep sleep mode with RTC memory retention consumes as low as 10 microamps, making the module suitable for battery-powered applications with periodic wake intervals.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
Buy ESP32 OLED Module for WiFi and Bluetooth Online in India
Purchase the ESP32 OLED Module for WiFi and Bluetooth online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.