TTGO T1

Development Board

Code name: TTGO_T1

ESP32 LILYGO

TTGO T1 is a development board based on the ESP32 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 4MB flash memory.

About TTGO T1

Classic ESP32 TTGO board with LiPo support and headers - great for basic wireless development and IoT builds.

Where to Buy TTGO T1

AliExpress Best value

View Price

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Technical Specifications

Complete technical specification details for TTGO T1

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 4.2

BLE 4.2

Microcontroller

Model esp32

Clock Speed 240 MHz

Flash Size 4MB

Architecture xtensa

✨ Features & Pins

Digital IO 40

Analog Input 16

PWM 16

Interrupts 16

Quick Setup

Copy-paste configs for TTGO T1 - auto‑generated from this board's exact hardware specs.

ESP32 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select Ttgo T1 from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Ttgo T1

CPU Frequency 240 MHz

Flash Size 4MB

Flash Mode DIO

Upload Speed 921600

Architecture Xtensa

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Ttgo T1" for the TTGO T1.

platformio.ini


[env:ttgo-t1]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for TTGO T1
board_build.mcu        = esp32
board_build.f_cpu      = 240000000L
board_build.flash_size = 4MB
board_build.flash_mode = dio
board_upload.flash_size = 4MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32dev
  framework:
    type: arduino   # or "esp-idf"

# TTGO T1 - 240 MHz ESP32
# Flash: 4MB | USB: N/A

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 4MB \
    0x1000 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x1000

TTGO T1 Pinout Diagram

Complete pin reference for TTGO T1

Safe Pins to Use

These pins are safe for general GPIO usage without boot or system conflicts

OLED RST

OLED SDA

OLED SCL

SDCard CS

SDCard MOSI

SDCard MISO

SDCard SCLK

LORA MOSI

LORA MISO

LORA SCLK

LORA CS

LORA RST

LORA DIO0

DS3231 SDA

DS3231 SCL

Why Are These Pins Safe?

✓ No boot sequence involvement

✓ No flash/PSRAM connections

✓ No USB or JTAG conflicts

✓ Freely assignable without issues

Pins to Avoid or Use with Caution

Reserved for critical functions. Misuse may cause boot failures, programming issues, or system conflicts.

Strapping Pins

Boot behavior & flash voltage

JTAG Debugging

Low-level debugging interface

USB Pins

USB Serial/JTAG communication

Flash/SPI Pins

Memory & PSRAM connections

UART Serial

Debugging & firmware uploads

PIN	Label	Why Avoid	Type

Useful Links

Datasheets and resources for TTGO T1

ESP32 Datasheet

Microcontroller reference

TTGO T1 Custom Pin Mapping

Pin configuration and GPIO mapping for TTGO T1

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Function	ESP Pin	I/O Type	Description
1	OLED RST	GPIO16	output	OLED Reset
2	OLED SDA	GPIO21	bidirectional	I2C Data Line
3	OLED SCL	GPIO22	bidirectional	I2C Clock Line
4	SDCard CS	GPIO13	output	SPI Chip Select for SD Card
5	SDCard MOSI	GPIO15	bidirectional	SPI Master Out Slave In for SD Card
6	SDCard MISO	GPIO2	bidirectional	SPI Master In Slave Out for SD Card
7	SDCard SCLK	GPIO14	bidirectional	SPI Clock Line for SD Card
8	LORA MOSI	GPIO27	bidirectional	SPI Master Out Slave In for LoRa
9	LORA MISO	GPIO19	bidirectional	SPI Master In Slave Out for LoRa
10	LORA SCLK	GPIO5	bidirectional	SPI Clock Line for LoRa
11	LORA CS	GPIO18	output	SPI Chip Select for LoRa
12	LORA RST	GPIO23	output	LoRa Reset
13	LORA DIO0	GPIO26	input	LoRa Interrupt Pin
14	DS3231 SDA	GPIO21	bidirectional	I2C Data Line for DS3231 RTC
15	DS3231 SCL	GPIO22	bidirectional	I2C Clock Line for DS3231 RTC

Legend

Function Pin role

GPIO ESP32 pin

I/O Direction

# Pin number

Pin Mappings

Complete pinout and GPIO mapping for TTGO T1

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
0	A11	T1
1			PWM	TX
2	A12	T2	PWM	MISO
3			PWM	RX
4	A10	T0	PWM
12	A15	T5	PWM
13	A14	T4	PWM	SS
14	A16	T6	PWM	SCK
15	A13	T3	PWM	MOSI
21			PWM	SDA
22			PWM	LED_BUILTIN
23			PWM	SCL
25	A18		PWM	DAC1
26	A19		PWM	DAC2
27	A17	T7	PWM
32	A4	T9	PWM
33	A5	T8	PWM
34	A6
35	A7
36	A0
39	A3

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for TTGO T1

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x1000`
Flash mode	dio
Boot mode	dio
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)