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Microcontroller · Development Board
LilyGO T-Display-S3
An ESP32-S3 board with a 170x320 parallel LCD, two user buttons, and Li-Po charging, widely used for badges, dashboards, and small connected displays.
Processor
ESP32-S3R8 dual-core Xtensa LX7
Logic
3.3 V GPIO
Power
USB-C or 1S Li-Po (JST connector with charging)
Format
Compact board with integrated 1.9-inch LCD
Check before wiring
- Most GPIOs are committed to the parallel LCD; few free pins remain on the side headers.
- GPIO0 is the boot button and exposed GPIO3 is also a strapping pin; keep both at valid levels during reset.
- Battery voltage sense divider is always connected and draws standby current.
Interfaces
GPIOI2CSPIUARTADCPWMUSBWi-FiBluetooth
Source-backed connector
Interactive pin map
Pin map
Connector
Two 11-pin side headers
Signals grouped by function — schematic layout, not to physical scale
Dense header — open Full view for a roomier, fully-labelled diagram.
Simplified diagram, grouped by function — not to physical scale. Pin data is source-backed; verify against the linked documentation.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- All ESP32-S3 GPIO is 3.3 V only.
- GPIO3 is a boot-strapping pin; do not force it to the wrong level during reset.
- GPIO5-9, 14, 15, and 38-48 are consumed by the display, backlight, buttons, or battery monitor and are not part of the side-header map.
All 24 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| P2 left header (top to bottom) | ||||
| 1 | Power | 3V3 | ||
| 2 | ADC | ADC1 CH0 / Touch 1 | ||
| 3 | ADC | ADC1 CH1 / Touch 2 | ||
| 4 | Alt | ADC1 CH2 / Touch 3 / Strapping | ||
| 5 | SPI | SPI | SPI CS / ADC1 CH9 | |
| 6 | SPI | SPI | SPI D / ADC2 CH0 | |
| 7 | SPI | SPI | SPI CLK / ADC2 CH1 | |
| 8 | SPI | SPI | SPI Q / ADC2 CH2 | |
| 9 | Reserved | |||
| 10 | Reserved | |||
| 11 | Ground | GND | ||
| 12 | Power | 5V | ||
| P1 right header (top to bottom) | ||||
| 1 | Ground | GND | ||
| 2 | Ground | GND | ||
| 3 | GPIO | CLK OUT1 | ||
| 4 | GPIO | CLK OUT2 | ||
| 5 | UART | UART1 | UART1 RX / ADC2 CH7 | |
| 6 | UART | UART1 | UART1 TX / ADC2 CH6 | |
| 7 | GPIO | |||
| 8 | ADC | ADC2 CH5 | ||
| 9 | Reserved | |||
| 10 | Ground | GND | ||
| 11 | Ground | GND | ||
| 12 | Power | 3V3 | ||
Why it matters
- Vendor GitHub publishes the schematic and pin map.
- 8-bit parallel LCD bus driven by the S3's LCD peripheral for fast refresh.
- Onboard battery charging and voltage divider for fuel reading.
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