LilyGo T-Display-S3 AMOLED Development Board

Code name: LILYGO_T_DISPLAY_S3

LilyGo T-Display-S3 AMOLED development board is based on esp32s3 microcontroller and uses xtensa architecture. This board has a maximum CPU frequency of 240 MHz and a flash size of 16MB.

⚡ Tech Specs 📌 Pinout 🔗 Useful Links 🗺️ Mappings 🛠️ Tools

About LilyGo T-Display-S3 AMOLED

🚀 The LilyGo T-Display-S3 AMOLED is a cutting-edge development board featuring an ESP32-S3 chip with integrated WiFi and Bluetooth 5 capabilities. It boasts a 1.91-inch AMOLED display with a resolution of 536x240 pixels, driven by an RM67162 controller, offering vibrant visuals for embedded applications. ⚡

📡 With support for WiFi 802.11 b/g/n and Bluetooth 5 (LE), it ensures seamless wireless connectivity for IoT projects. The board is equipped with 8MB PSRAM and 16MB Flash memory, providing ample storage and performance.

💾 Designed with multiple GPIOs, PWM, ADC, I2C, and SPI support, it is suitable for various applications, including sensor interfacing, graphical user interfaces, and wireless communication.

Where to Buy

Starting from

$32.50 per unit

Amazon.de Ships to EU

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Technical Specifications

🖥️ Display

Type AMOLED

Size 1.91"

Resolution 536x240

Driver RM67162

🛰️ Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

🧠 Microcontroller

Model esp32s3

Clock Speed 240 MHz

Flash Size 16MB

PSRAM Size 8MB

Architecture xtensa

✨ Features

48 digital IO pins
46 external interrupt pins
20 analog input pins
27 PWM pins

View Full Datasheet

LilyGo T-Display-S3 AMOLED Pinout

The LilyGo T-Display-S3 AMOLED pinout offers a variety of digital and analog pins, along with a dedicated display interface. Key pins include:

5V and 3.3V power rails for stable operation.

SDA and SCL for I2C, MISO, MOSI, SCK, and SS for SPI communication.

Additionally, dedicated LCD pins ensure efficient display control.

✅ Safe Pins to Use

For general GPIO usage, these are the safest and most flexible choices:

🔹 IO1

🔹 IO2

🔹 IO4

🔹 IO5

🔹 IO6

🔹 IO7

🔹 IO8

🔹 IO15

🔹 IO16

🔹 IO17

🔹 IO18

🔹 IO21

Why Are These Pins Safe?

Not involved in bootstrapping → No impact on device boot mode or system startup
Not linked to flash memory or PSRAM → Won't interfere with storage or memory access
Not dedicated to USB or JTAG → Free for general use without affecting debugging
No special hardware connections → Freely assignable without internal conflicts

⚠️ Pins to Avoid or Use with Caution

Some pins are reserved for critical functions like bootstrapping, JTAG debugging, USB communication, and flash memory operations. Misusing these pins may lead to boot failures, programming issues, USB conflicts, or disruptions in flash storage.

Critical Pin Categories:

🛠️ Strapping Pins: Control boot behavior and flash voltage selection
🔗 JTAG Debugging Pins: Required for low-level debugging
🔌 USB Communication Pins: Used for USB Serial/JTAG communication
⚡ Flash Memory & SPI Pins: Connected to SPI flash memory and PSRAM
📡 UART Serial Communication Pins: Used for debugging and firmware uploads

PIN	Label	Reason	Function
IO0	GPIO0	Must be pulled high (default) or low (to enter UART download mode) at reset. Using it for other functions can interfere with boot mode configuration.	🛠️ Strapping
IO3	GPIO3	Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface.	🛠️ Strapping
IO9	FSPIHD	Connected to external flash (data/hold signal) on most modules. Not recommended for use as GPIO, since it must remain dedicated to flash communication.	⚡ Flash
IO10	FSPICS0	Used to select the external flash chip. It is required for flash access and cannot be repurposed without losing flash connectivity	⚡ Flash
IO11	FSPID	Used as a data line for flash (and in-package PSRAM). It should not be used as GPIO when the flash/PSRAM is in use.	⚡ Flash
IO12	FSPICLK	Drives the flash (and PSRAM) clock. This critical signal must be reserved for memory and not used as general GPIO.	⚡ Flash
IO13	FSPIQ	Used as a data line for flash/PSRAM transfers. Not available for other uses when flash/PSRAM is connected.	⚡ Flash
IO14	FSPIWP	Connected to external flash (data/write-protect signal). Not recommended as GPIO because it’s reserved for flash operations.	⚡ Flash
IO38	FSPIWP	On flash-equipped chips, this pin is tied to the flash’s WP# (or D3) line. It should be avoided for other use, as it’s needed for flash operations.	⚡ Flash
IO39	MTCK (GPIO39)	Default JTAG debugging TCK pin. If JTAG is needed, this pin must be free; it may also be used internally for PSRAM chip select on certain modules, so avoid repurposing it.	🪛 Other
IO40	MTDO (GPIO40)	Default JTAG TDO output for debugging. Using it as GPIO will interfere with JTAG debugging functionality.	🪛 Other
IO41	MTDI (GPIO41)	Default JTAG TDI input for debugging. Should be reserved for JTAG or left unused if JTAG is to remain available.	🪛 Other
IO42	MTMS (GPIO42)	Default JTAG TMS signal for debugging. Using this pin for other purposes will disable the JTAG interface (unless JTAG is rerouted to USB).	🪛 Other
IO43	U0TXD (GPIO43)	Used for bootloader output and UART console logs. If repurposed, you will lose the default serial output (and programming via UART0).	🪛 Other
IO44	U0RXD (GPIO44)	Used for bootloader input (download mode via serial). If repurposed, you cannot use the default UART0 download mode for programming the chip.	🪛 Other
IO45	GPIO45	Determines flash/PSRAM power voltage (3.3 V vs 1.8 V) at boot. Must match hardware configuration; using as GPIO can upset flash supply setting.	🛠️ Strapping
IO46	GPIO46	Must be at a defined level during reset (with GPIO0) to select normal or download boot and UART/USB print mode. This pin is input-only (no output drive), so it should be left for its intended strapping function.	🛠️ Strapping
IO47	SPICLK_P	Used only on variants with Octal SPI interface (e.g. ESP32-S3R16V) as part of the differential clock pair. On such chips it operates at 1.8 V and is reserved for the high-speed octal SPI clock, not for general GPIO use.	⚡ Flash
IO48	SPICLK_N	Used only on variants with Octal SPI interface, as the negative leg of the differential clock&. On such chips it operates at 1.8 V; it should be avoided for GPIO to prevent conflicts with the octal flash/PSRAM clock.	⚡ Flash

LilyGo T-Display-S3 AMOLED Useful Links

🔗 Datasheet

https://github.com/Xinyuan-LilyGO/T-Display-S3-AMOLED

🔗 ESP32S3 Datasheet

https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf

LilyGo T-Display-S3 AMOLED Pin Mappings

This development board provides 48 digital IO pins, out of which 46 can be used as external interrupt pins , 20 as analog input pins and 27 pins have Pulse-Width Modulation (PWM) .

Pin	Function	ESP Pin	Input/Output	Description
1	3V3	3.3V	POWER OUTPUT	3.3V power output
2	GND	GND	POWER GROUND	Ground connection
3	5V	5V	POWER INPUT	5V power input for the board
4	IO0	A0	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
5	IO1	A1	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
6	IO2	A2	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
7	IO3	A3	BIDIRECTIONAL	GPIO, ADC pin, Touch, PWM
8	IO4	BAT_VOLT	INPUT	GPIO, Battery Voltage Sense, PWM
9	IO5	LCD_RES	OUTPUT	GPIO, LCD Reset, PWM
10	IO6	LCD_CS	OUTPUT	GPIO, LCD Chip Select, PWM
11	IO7	LCD_DC	OUTPUT	GPIO, LCD Data/Command, PWM
12	IO8	LCD_WR	OUTPUT	GPIO, LCD Write, PWM
13	IO9	LCD_RD	OUTPUT	GPIO, LCD Read, PWM
14	IO10	SS	BIDIRECTIONAL	GPIO, SPI Slave Select, ADC pin, Touch, PWM
15	IO11	MOSI	BIDIRECTIONAL	GPIO, SPI Master Out Slave In, ADC pin, Touch, PWM
16	IO12	SCK	BIDIRECTIONAL	GPIO, SPI Clock, ADC pin, Touch, PWM
17	IO13	MISO	BIDIRECTIONAL	GPIO, SPI Master In Slave Out, ADC pin, Touch, PWM
18	IO14	BUTTON_2	INPUT	GPIO, User Button, PWM
19	IO15	LCD_POWER_ON	OUTPUT	GPIO, LCD Power Enable, PWM
20	IO16	TP_INIT	BIDIRECTIONAL	GPIO, ADC pin, PWM
21	IO17	SCL	BIDIRECTIONAL	GPIO, I2C Clock, ADC pin, PWM
22	IO18	SDA	BIDIRECTIONAL	GPIO, I2C Data, ADC pin, PWM
23	IO21	TP_RESET	BIDIRECTIONAL	GPIO, PWM
24	IO38	LCD_BL	OUTPUT	GPIO, LCD Backlight, PWM
25	IO39	LCD_D0	OUTPUT	GPIO, LCD Data 0, PWM
26	IO40	LCD_D1	OUTPUT	GPIO, LCD Data 1, PWM
27	IO41	LCD_D2	OUTPUT	GPIO, LCD Data 2, PWM
28	IO42	LCD_D3	OUTPUT	GPIO, LCD Data 3, PWM
29	IO43	TX	BIDIRECTIONAL	GPIO, UART Transmit, PWM
30	IO44	RX	BIDIRECTIONAL	GPIO, UART Receive, PWM
31	IO45	LCD_D4	OUTPUT	GPIO, LCD Data 4, PWM
32	IO46	LCD_D5	OUTPUT	GPIO, LCD Data 5, PWM
33	IO47	LCD_D6	OUTPUT	GPIO, LCD Data 6, PWM
34	IO48	LCD_D7	OUTPUT	GPIO, LCD Data 7, PWM

Function Pin Function

ESP Pin Pin on ESP32

I/O Input/Output Pin

Description Pin Description

LilyGo T-Display-S3 AMOLED Pins Mapping Arduino IDE

Below you can find the LilyGo T-Display-S3 AMOLED pinout. This development board provides 48 digital IO pins, out of which 46 can be used as external interrupt pins, 20 as analog input pins and 27 pins have Pulse-Width Modulation (PWM).

Pin	Analog	Touch	PWM	Other
0				BUTTON_1
1	A0	T1	PWM
2	A1	T2	PWM
3	A2	T3	PWM
4			PWM	BAT_VOLT
10	A9	T10	PWM	SS
11	A10	T11	PWM	MOSI
12	A11	T12	PWM	SCK
13	A12	T13	PWM	MISO
17	A16		PWM	SCL
18	A17		PWM	SDA
43			PWM	TX
44			PWM	RX

Analog Analog input pins

Touch Touch pins

Function Function pins

RX / TX Receive/Transmit

LED_BUILTIN Built-in LED

PWM Pulse-Width Modulation

Default Tools

Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	0x0
Flash mode	dio
Boot mode	qio
PSRAM type	opi
Maximum upload size	3072 Kb (3145728 B)
Maximum data size	320 Kb (327680 B)

The LilyGo T-Display-S3 AMOLED development board by default uses esptool_py uploader tool, esp_ota network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x0". Flash mode and boot mode for LilyGo T-Display-S3 AMOLED development board by default is dio and qio respectively. The board uses opi PSRAM type. When using Arduino IDE, the maximum sketch upload size is 3072 Kb (3145728 B) and maximum data size for variables is 320 Kb (327680 B).