LILYGO T3 LoRa32 V1.6.1

Model reference: T3 LoRa32 V1.6.1

Manufacturer: LILYGO

Product Description

The LILYGO T3 LoRa32 V1.6.1 is a development board featuring an ESP32 microcontroller with integrated WiFi, Bluetooth, and a Semtech SX1276/SX1278 LoRa radio transceiver. It includes a 0.96” OLED display and is designed for IoT applications requiring long-range wireless communication.

Key Features

• ESP32 dual-core processor @ 240MHz
• 4MB Flash memory
• SX1276/SX1278 LoRa radio (433MHz or 868/915MHz variants)
• 0.96” OLED display (128x64)
• WiFi 802.11 b/g/n
• Bluetooth Classic and BLE
• Micro-USB connector
• LiPo battery connector with charging circuit
• SD card slot
• Onboard CP2104 USB-to-UART bridge

GPIO Pinout

LoRa SX127x Pins

Function	GPIO
SPI CLK	GPIO5
SPI MOSI	GPIO27
SPI MISO	GPIO19
CS	GPIO18
RST	GPIO23
DIO0	GPIO26
DIO2	GPIO32

Display (OLED)

Function	GPIO
SDA	GPIO21
SCL	GPIO22
RST	GPIO16

Other Pins

Function	GPIO
Button	GPIO0
LED	GPIO25
Battery ADC	GPIO35

Basic Configuration

Minimum configuration required for the LILYGO TTGO T3 LoRa32 V1.6.1:

esphome:
  name: "t3-lora32"

esp32:
  variant: esp32
  cpu_frequency: 240MHZ
  framework:
    type: esp-idf

logger:

api:

ota:
  platform: esphome

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

# SPI bus for LoRa radio
spi:
  clk_pin: GPIO5
  mosi_pin: GPIO27
  miso_pin: GPIO19

# I2C for OLED display
i2c:
  sda: GPIO21
  scl: GPIO22
  frequency: 400kHz

LoRa Radio Configuration

Complete configuration with LoRa modulation:

# LoRa Radio Configuration (SX1276/SX1278)
sx127x:
  dio0_pin: GPIO26
  cs_pin: GPIO18
  rst_pin: GPIO23
  pa_pin: BOOST
  pa_power: 10
  bandwidth: 125_0kHz
  crc_enable: true
  frequency: 433920000
  modulation: LORA
  rx_start: true
  sync_value: 0x12
  preamble_size: 8
  spreading_factor: 7
  coding_rate: CR_4_6
  on_packet:
    then:
      - lambda: |-
          ESP_LOGD("lora", "Received packet RSSI: %.2f dBm, SNR: %.2f dB, Data: %s",
                   rssi, snr, format_hex(x).c_str());

# Example button to send LoRa packet
button:
  - platform: template
    name: "Send LoRa Packet"
    on_press:
      then:
        - sx127x.send_packet:
            data: [0xDE, 0xAD, 0xBE, 0xEF, 0xCA, 0xFE, 0xBA, 0xBE]

FSK Modulation

Configuration for FSK modulation in packet mode:

# FSK Radio Configuration (SX1276/SX1278)
sx127x:
  dio0_pin: GPIO26
  cs_pin: GPIO18
  rst_pin: GPIO23
  pa_pin: BOOST
  pa_power: 10
  bitrate: 4800
  bitsync: true
  crc_enable: true
  frequency: 433920000
  modulation: FSK
  packet_mode: true
  payload_length: 8
  rx_start: true
  sync_value: [0x33, 0x33]
  preamble_size: 4
  preamble_detect: 2
  on_packet:
    then:
      - lambda: |-
          ESP_LOGD("fsk", "Received packet: %s", format_hex(x).c_str());

# Example button to send FSK packet
button:
  - platform: template
    name: "Send FSK Packet"
    on_press:
      then:
        - sx127x.send_packet:
            data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C]

OOK Modulation with Remote Transmitter/Receiver

Configuration for OOK modulation in continuous mode using the remote transmitter and receiver components:

# OOK Radio Configuration (SX1276/SX1278)
sx127x:
  cs_pin: GPIO18
  rst_pin: GPIO23
  frequency: 433920000
  modulation: OOK
  packet_mode: false
  bitsync: false
  rx_start: true
  bandwidth: 50_0kHz
  rx_floor: -85
  pa_pin: BOOST
  pa_power: 10

# Remote receiver on DIO2
remote_receiver:
  pin:
    number: GPIO32
    allow_other_uses: true
    mode:
      input: true
      output: true
      pullup: true
      open_drain: true
  filter: 50us
  dump: raw
  idle: 1ms

# Remote transmitter on DIO2 (shared with receiver)
remote_transmitter:
  pin:
    number: GPIO32
    allow_other_uses: true
    mode:
      input: true
      output: true
      pullup: true
      open_drain: true
  eot_level: false
  carrier_duty_percent: 100%
  on_transmit:
    then:
      - sx127x.set_mode_standby
      - remote_transmitter.digital_write: false
      - sx127x.set_mode_tx
  on_complete:
    then:
      - sx127x.set_mode_standby
      - remote_transmitter.digital_write: true
      - sx127x.set_mode_rx

# Example button to transmit OOK signal
button:
  - platform: template
    name: "Transmit OOK"
    on_press:
      then:
        - remote_transmitter.transmit_raw:
            code: [614, -614, 600, -614, 614, -614, 601, -614]

OLED Display Configuration

Configuration to use the onboard 0.96” OLED display:

# OLED Display
display:
  - platform: ssd1306_i2c
    model: "SSD1306 128x64"
    address: 0x3C
    lambda: |-
      it.printf(0, 0, id(display_font), "T3 LoRa32");
      it.printf(0, 16, id(display_font), "V1.6.1");
      it.printf(0, 32, id(display_font), "%.1f dBm", id(wifi_signal_db).state);

font:
  - file: "gfonts://Roboto"
    id: display_font
    size: 14

sensor:
  - platform: wifi_signal
    id: wifi_signal_db
    name: "WiFi Signal"
    update_interval: 60s

Battery Monitoring

Configuration to monitor LiPo battery voltage:

sensor:
  - platform: adc
    pin: GPIO35
    name: "Battery Voltage"
    attenuation: 12db
    filters:
      - multiply: 2.0  # Voltage divider correction
    update_interval: 60s

SD Card

The board includes an SD card slot on the following pins:

Function	GPIO
CS	GPIO13
MOSI	GPIO15
MISO	GPIO2
CLK	GPIO14

Links

• Product Page
• GitHub Repository
• Schematic