Waveshare has launched the ESP32-S3-Touch-LCD-3.49, a compact yet powerful development board featuring a 3.49-inch wide capacitive touch LCD (640×172 resolution). Designed for HMI and AI voice applications, this board is ideal for handheld devices, smart panels, kiosks, meters, and compact IoT dashboards.
Key Highlights
- Wide 3.49-inch IPS Touch Display – High-resolution 640×172 screen with 16.7M colors, wide 178° viewing angle, and capacitive touch input.
- AI Voice Interaction – Dual microphones with echo cancellation and noise reduction, plus support for both online LLM platforms (DeepSeek, Doubao) and offline voice control.
- Flexible Power Options – Two case variants:
- Case A: 18650 lithium battery support.
- Case B: 3.7V Li-Po battery option.
- Connectivity & Expansion – Wi-Fi 4, Bluetooth 5.0 LE, USB-C, microSD slot, onboard antenna + IPEX connector, GPIO/I²C/UART expansion headers.
- Rich Peripherals – Built-in IMU (QMI8658), RTC (PCF85063), I²C GPIO expander, external speaker support, and full audio codec chain (ES7210 ADC + ES8311 DAC).
Technical Specifications
Core
- MCU: Espressif ESP32-S3R8 (Dual-core Tensilica LX7 @ 240 MHz)
- Memory: 512KB RAM, 8MB PSRAM
- Flash: 16MB QSPI NOR
- ROM: 384KB
Display
- 3.49-inch IPS LCD
- Resolution: 640 × 172, 16.7M colors
- Contrast: 1200:1, Viewing Angle: 178°
- Driver: AXS15231B (QSPI)
- Touch: Capacitive controller (I²C)
Audio
- Dual microphones with echo cancellation
- ES7210 ADC & ES8311 DAC
- Speaker output (MX1.25 2-pin header)
Expansion & I/O
- 22-pin 2.54mm expansion pads
- 15-pin header with GPIO, I²C, UART, VBUS, 3.3V, GND
- USB 2.0 pads (IO19/IO20)
Power
- USB-C (5V) or Battery (Li-Po / 18650, depending on case)
- Integrated PMIC for charge/discharge management
Dimensions
- Case A (18650): 98.50 × 34.80 × 31.80 mm
- Case B (Li-Po): 98.50 × 34.80 × 22.80 mm
Software & Development
The ESP32-S3-Touch-LCD-3.49 supports both Arduino IDE and ESP-IDF, making it accessible for beginners and powerful enough for advanced users.
- Arduino IDE: Quick prototyping with LVGL v8/v9 GUI demos.
- ESP-IDF: Full development toolchain with compiler, debugger, and VSCode integration.
- AI Speech Support: Online (LLM platforms like DeepSeek/Doubao) & Offline voice commands.
- Demo Code Provided: Wi-Fi AP/STA, IMU, RTC, SD card, audio, battery management, and GUI rendering.
- UI Tools: Compatible with SquareLine Studio for GUI design.
Pricing & Availability
- AliExpress: $40.84 (no battery) / $42.39 (Li-Po version)
- Amazon: $42.99 (both versions)
- Waveshare Official Store: $29.99 (no battery) / $31.99 (Li-Po version) (shipping not included)
The Waveshare ESP32-S3-Touch-LCD-3.49 is a versatile development board that brings together a wide touch display, AI voice support, robust connectivity, and expandable hardware in a compact form factor. Whether you’re building handheld IoT devices, smart dashboards, or AI-enabled HMI panels, this board offers a strong balance between performance and price.
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