ESP32-S3-Touch-LCD-1.85B

The ESP32-S3-Touch-LCD-1.85B is a high-performance, highly integrated microcontroller development board designed by Waveshare. It is equipped with an ESP32-S3R8 dual-core LX7 processor (240 MHz), supports 2.4 GHz Wi-Fi and Bluetooth 5 (LE), and features 512 KB SRAM, stacked 8 MB PSRAM, and external 16 MB Flash. The product adopts an electronic badge form factor with a CNC aluminum alloy enclosure, and includes a 1.85inch capacitive touch LCD (360×360), a dual-microphone array, audio codec, echo cancellation, battery monitoring, a six-axis IMU, a Li-battery interface, and speaker pads. It is suitable for AI voice interaction, smart hardware, human-machine interface (HMI), and product prototyping applications.

If you are looking for:

• Accelerating development with AI tools: Share this page link with AI tools to help them accurately understand the board hardware and generate usable code.
• Developing with Arduino IDE: See Working with Arduino
• Developing with ESP-IDF: See Working with ESP-IDF
• Downloading schematics, datasheets, and example code: See Related Resources
• Having issues: See Product FAQ or contact Technical Support

SKU	Product
34554	ESP32-S3-Touch-LCD-1.85B
34556	ESP32-S3-Touch-LCD-1.85B-EN

Onboard Resources

1. ESP32-S3R8 Wi-Fi and Bluetooth SoC, up to 240MHz operating frequency, with onboard 8MB PSRAM
2. 16MB NOR Flash
3. QMI8658 Six-axis Inertial Measurement Unit (IMU), containing a 3-axis gyroscope and a 3-axis accelerometer
4. Dual-microphone Design Combined with echo cancellation circuitry for higher quality audio capture
5. Onboard Antenna Supports 2.4GHz Wi-Fi (802.11 b/g/n) and Bluetooth 5 (LE)
6. Screen Interface
7. ES7210 Echo Cancellation Chip For echo cancellation and improved audio capture accuracy
8. ES8311 Audio Codec Chip
9. BQ27220 Battery gauge chip
10. BOOT Button Used for device startup and functional debugging
11. PWR Power Button Controls power on/off and supports custom functions
12. Type-C Interface ESP32-S3 USB interface for program flashing and log printing
13. MX1.25 Lithium Battery Header MX1.25 2PIN connector for connecting a 3.7V lithium battery, supports charging and discharging
14. Onboard Speaker Pads
15. Serial Communication Interface SH1.0 4PIN connector
16. I2C Interface SH1.0 4PIN connector

Peripheral Quick Reference

Module	Device / Function	Interface	Address / Parameters	GPIO / Signals
LCD	ST77916	QSPI	360×360, common RGB565, 16-bit color depth	CS=GPIO21, PCLK=GPIO40, DATA0=GPIO46, DATA1=GPIO45, DATA2=GPIO42, DATA3=GPIO41, RST=GPIO3, BL=GPIO5
Touch	CST816S capacitive touch	I2C	7-bit address 0x15	SCL=GPIO10, SDA=GPIO11, RST=GPIO1, INT=GPIO4
IMU	QMI8658 6-axis sensor	I2C	7-bit address 0x6B	SCL=GPIO10, SDA=GPIO11
Audio Output	ES8311 audio codec	I2C + I2S	7-bit address 0x30	I2C SCL=GPIO10, SDA=GPIO11; MCLK=GPIO2, BCLK=GPIO48, LRCK=GPIO38, DOUT=GPIO47, DIN=GPIO39, PA=GPIO9
Audio Input	ES7210 echo cancellation / dual microphone	I2C + I2S	7-bit address 0x80	I2C SCL=GPIO10, SDA=GPIO11; MCLK=GPIO2, BCLK=GPIO48, LRCK=GPIO38, DIN=GPIO39
Battery Gauge	BQ27220	I2C	7-bit address 0x55	SCL=GPIO10, SDA=GPIO11
RTC	PCF85063 real-time clock	I2C	7-bit address 0x51	SCL=GPIO10, SDA=GPIO11, INT=GPIO6
TF	SDMMC	SDMMC 4-bit	Supports SD_MMC	CLK=GPIO15, CMD=GPIO14, D0=GPIO16, D1=GPIO17, D2=GPIO12, D3=GPIO13
USB Type-C	ESP32-S3 native USB	USB	Download, logging	USB_N=GPIO19, USB_P=GPIO20
UART0	Serial communication interface	UART	SH1.0 4-pin connector	U0TXD=GPIO43, U0RXD=GPIO44
BOOT button	BOOT / download mode	GPIO	Pull-up, low when pressed	GPIO0

Pinout Definition

When using the reserved interfaces on the ESP32-S3-Touch-LCD-1.85B board, pay attention to wire colors and corresponding functions to avoid damaging the board due to incorrect wiring.

Expansion Interfaces

Type	Signals
Power	5V / 3V3 / GND
I2C	SCL(GPIO10) / SDA(GPIO11)
UART	TXD(GPIO43) / RXD(GPIO44)
USB Pads	DN(GPIO19) / DP(GPIO20)

GPIO Allocation

The table below lists the GPIOs already occupied by onboard circuits and those brought out to expansion headers.

GPIO	Signal Name	Connected To	Remarks
GPIO0	BOOT	BOOT button	Strapping pin; press and hold during power-on, then release to enter download mode
GPIO1	TP_RST	CST816S touch reset	-
GPIO2	I2S_MCLK	ES8311 / ES7210 audio clock	-
GPIO3	LCD_RST	ST77916 LCD reset	-
GPIO4	TP_INT	CST816S touch interrupt	-
GPIO5	LCD_BL	LCD backlight control	PWM dimming
GPIO6	RTC_INT	PCF85063 real-time clock interrupt	-
GPIO9	PA_CTRL	Power amplifier control	Audio output amplifier enable
GPIO10	I2C_SCL	Shared I2C SCL for touch, IMU, audio, battery gauge; also brought out to I2C interface	I2C devices listed in peripheral quick reference table
GPIO11	I2C_SDA	Shared I2C SDA for touch, IMU, audio, battery gauge; also brought out to I2C interface	I2C devices listed in peripheral quick reference table
GPIO12	SD_D2	TF D2	SDMMC 4-bit
GPIO13	SD_D3	TF D3	SDMMC 4-bit
GPIO14	SD_CMD	TF CMD	SDMMC
GPIO15	SD_CLK	TF CLK	SDMMC
GPIO16	SD_D0	TF D0	SDMMC
GPIO17	SD_D1	TF D1	SDMMC
GPIO19	USB_N	USB Type-C D-	ESP32-S3 native USB
GPIO20	USB_P	USB Type-C D+	ESP32-S3 native USB
GPIO21	LCD_CS	ST77916 QSPI chip select	-
GPIO38	I2S_LRCK	ES8311 / ES7210 left-right clock	-
GPIO39	I2S_DIN	ES8311 / ES7210 I2S data input	Recording data input
GPIO40	LCD_PCLK	ST77916 QSPI clock	-
GPIO41	LCD_DATA3	ST77916 QSPI data line 3	-
GPIO42	LCD_DATA2	ST77916 QSPI data line 2	-
GPIO43	U0TXD	Serial communication interface TXD	Debug / expansion
GPIO44	U0RXD	Serial communication interface RXD	Debug / expansion
GPIO45	LCD_DATA1	ST77916 QSPI data line 1	-
GPIO46	LCD_DATA0	ST77916 QSPI data line 0	-
GPIO47	I2S_DOUT	ES8311 I2S data output	Playback data output
GPIO48	I2S_BCLK	ES8311 / ES7210 I2S bit clock	-

Precautions

• When connecting external I2C devices, avoid address conflicts with onboard I2C addresses such as 0x15, 0x6B, 0x30, 0x80, 0x51, 0x55.
• GPIO19/GPIO20 are connected to USB Type-C and are not recommended for use as general-purpose GPIO.
• GPIO0 is the BOOT pin; it is not recommended to use it as a general-purpose input.
• GPIOs already occupied by onboard peripherals such as LCD, touch, audio, and SDMMC should not be reused, otherwise the corresponding functions may become abnormal.

LCD Screen Specifications

Parameter	Value
Display Panel	LCD
Display Size	1.85 inches
Resolution	360 × 360
Display Colors	262K colors
Display Interface	QSPI
Display Driver	ST77916
Touch Controller	CST816S
Touch Interface	I2C

Specifications

Parameter	Value
Interface	USB Type-C
Main Controller	ESP32-S3R8
SRAM / ROM	512KB SRAM / 384KB ROM
PSRAM / Flash	8MB PSRAM / 16MB Flash
Screen Type	TFT LCD
Screen Controller	Display: ST77916 Touch: CST816S
Onboard Devices	QMI8658 six-axis sensor ES8311 audio codec chip ES7210 echo cancellation chip BQ27220 battery gauge chip PCF85063 real-time clock Dual-microphone array Onboard speaker pads Micro SD Li-battery charging/discharging interface
Expansion Interfaces	I2C, UART, USB pads
Power Input	USB Type-C / 3.7V Li-battery interface

Dimensions

Development Methods

The ESP32-S3-Touch-LCD-1.85B supports two development frameworks: Arduino IDE and ESP-IDF, providing developers with flexible choices. You can select the appropriate development tool based on project requirements and personal preference.

Both development methods have their own advantages. Developers can choose based on their needs and skill levels. Arduino is simple to learn and quick to start, suitable for beginners and non-professionals. ESP-IDF provides more advanced development tools and stronger control capabilities, suitable for developers with professional backgrounds or higher performance requirements, and is more appropriate for complex project development.

• Arduino IDE is a convenient, flexible, and easy-to-use open-source electronics prototyping platform. It requires minimal foundational knowledge, allowing for rapid development after a short learning period. Arduino has a huge global user community, providing a vast amount of open-source code, project examples, and tutorials, as well as a rich library ecosystem that encapsulates complex functions, enabling developers to implement various features rapidly. You can refer to the Working with Arduino to complete the initial setup, and the tutorial also provides related example programs for reference.

• ESP-IDF, short for Espressif IoT Development Framework, is a professional development framework launched by Espressif Systems for its ESP series of chips. It is based on C language development and includes compilers, debuggers, flashing tools, etc. It supports development via command line or integrated development environments (such as Visual Studio Code with the Espressif IDF plugin), which provides features like code navigation, project management, and debugging. We recommend using VS Code for development. For the specific configuration process, please refer to the Working with ESP-IDF. The tutorial also provides relevant example programs for reference.