T-Beam-BPF get it now

Overview

LILYGO T-Beam-BPF is a variant of the T-Beam series featuring an integrated Band-Pass Filter (BPF) for improved LoRa signal reception in the 144–148 MHz VHF band. Based on the ESP32-S3 dual-core LX7 with Wi-Fi and Bluetooth 5.0, it pairs with the SX1278 LoRa module to deliver enhanced selectivity and noise rejection — ideal for amateur radio, APRS, and interference-prone environments. Includes a 0.96-inch SH1106 OLED, GPS module (L76K), AXP2101 PMU, and 18650 battery support.

Notes on Use

1. The device will not power on when a battery is inserted for the first time, because the onboard BMS is in shipping mode. Connect USB-C to activate the device. If the battery is removed and re-inserted, repeat this step.
2. Always connect the antenna before transmitting, otherwise the RF module may be damaged.

Block Diagram

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
LilyGo-LoRa-Series	✓		LoRa, GPS, OLED, PMU examples

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code, then restart VS Code
3. Open the LilyGo-LoRa-Series project folder via File → Open Folder
4. Wait for third-party library installation to complete
5. Open platformio.ini, uncomment the T-Beam-BPF environment in default_envs, and uncomment the matching src_dir line
6. Click ✓ to compile, connect via USB-C, click → to upload
7. Click the plug icon to monitor serial output

Arduino

1. Install Arduino IDE
2. Install Arduino ESP32
3. Copy all folders in the lib directory to your Arduino Sketchbook location:
   • Windows: C:\Users\{username}\Documents\Arduino
   • macOS: /Users/{username}/Documents/Arduino
   • Linux: /home/{username}/Arduino
4. Open the desired example from LilyGo-LoRa-Series/examples/
5. In Tools → Board, configure:

Arduino IDE Setting	Value
Board	ESP32S3 Dev Module
USB CDC On Boot	Enable
CPU Frequency	240 MHz (WiFi)
Flash Mode	QIO 80 MHz
Flash Size	16MB (128Mb)
Partition Scheme	16M Flash (3MB APP/9.9MB FATFS)
PSRAM	OPI PSRAM
Upload Mode	UART0/Hardware CDC
Upload Speed	921600
USB Mode	CDC and JTAG
Programmer	Esptool

6. In utilities.h, uncomment #define T_BEAM_S3_BPF
7. Click Upload

Development Platforms

1. Arduino IDE
2. PlatformIO
3. ESP-IDF

Related Videos

Key Features

• ESP32-S3 dual-core LX7 @ 240 MHz, Wi-Fi + Bluetooth 5.0
• SX1278 TCXO LoRa with integrated Band-Pass Filter (144–148 MHz VHF)
• Enhanced signal selectivity and noise immunity
• 0.96-inch SH1106 OLED (128 × 64, I2C)
• L76K GPS module for location tracking
• AXP2101 power management unit
• 18650 battery holder with charging support
• USB-C for programming and power

Specifications

Parameter	Value
SOC	ESP32-S3, Dual-core LX7 @ 240 MHz
Flash	16 MB
PSRAM	8 MB (OPI)
Wireless	Wi-Fi 2.4 GHz 802.11 b/g/n, Bluetooth 5.0
LoRa	SX1278 TCXO with BPF, 144–148 MHz VHF
Display	0.96-inch SH1106 OLED, 128 × 64, I2C
GPS	L76K
PMU	AXP2101
Battery	18650 Li-Ion holder
USB	1 × USB-C

Pin Diagram

Pins Map

Name	GPIO	Free
UART1 TX	43 (External QWIIC Socket)	✅
UART1 RX	44 (External QWIIC Socket)	✅
SDA	8 (External QWIIC Socket)	❌
SCL	9 (External QWIIC Socket)	❌
OLED (SH1106) SDA	Share with I2C bus	❌
OLED (SH1106) SCL	Share with I2C bus	❌
SPI MOSI	11	❌
SPI MISO	13	❌
SPI SCK	12	❌
SD CS	10	❌
SD MOSI	Share with SPI bus	❌
SD MISO	Share with SPI bus	❌
SD SCK	Share with SPI bus	❌
GNSS (L76K) TX	6	❌
GNSS (L76K) RX	5	❌
GNSS (L76K) PPS	7	❌
LoRa (SX1278) SCK	Share with SPI bus	❌
LoRa (SX1278) MISO	Share with SPI bus	❌
LoRa (SX1278) MOSI	Share with SPI bus	❌
LoRa (SX1278) RESET	18	❌
LoRa (SX1278) DIO0	14	❌
LoRa (SX1278) DIO1	21	❌
LoRa (SX1278) CS	1	❌
LoRa (SX1278) LDO EN	16	❌
LoRa (SX1278) Ctrl	39	❌
Button1 (BOOT)	0	❌
Button2	3	❌
PMU (AXP2101) IRQ	4	❌
PMU (AXP2101) SDA	Share with I2C bus	❌
PMU (AXP2101) SCL	Share with I2C bus	❌

Note: LDO EN is the Radio power control pin — High = Radio ON, Low = Radio OFF. LoRa Ctrl is the internal LNA power control — set High when receiving, Low when transmitting or sleeping.

I2C Device Addresses

Device	7-Bit Address	Shared Bus
OLED SH1106	0x3C	✅
PMU AXP2101	0x34	✅

Electrical Parameters

Feature	Details
USB-C Input Voltage	3.9 V – 6 V
Charge Current	0 – 1024 mA (programmable)
Battery Voltage	3.7 V

Note: This board has an integrated BMS. On first battery connection, connect USB-C to activate. If the battery is disconnected and reconnected, repeat activation.

Power Management Channels

Channel	Peripheral
DC1	ESP32-S3
DC2	Unused
DC3	External pin header
DC4	Unused
DC5	External pin header
LDO1 (VRTC)	Unused
ALDO1	External pin header
ALDO2	SD Card
ALDO3	External pin header
ALDO4	GNSS
BLDO1	Unused
BLDO2	External pin header
DLDO1	Unused
CPUSLDO	Unused
VBACKUP	Unused

Button Description

Button	Function
IO3	Customizable
PWR	PMU button — press to power on; hold 6 s to power off
BOOT	Boot mode / customizable
RST	Reset

LED Description

• CHG LED: Always on while charging, off when fully charged. Can be controlled by firmware.
• PPS LED: Connected to GPS PPS pin. Flashes when PPS pulse arrives. Cannot be turned off.

RF Parameters

Feature	Details
RF Module	SX1278 TCXO (XP02P181T)
Frequency Range	144–148 MHz
Transfer Rate (LoRa)	0.018 K–37.5 Kbps
Transfer Rate (FSK)	1.2 K–300 Kbps
Modulation	FSK, GFSK, MSK, GMSK, LoRa, OOK

RF Notes:

1. Always connect the antenna before powering on to transmit.
2. Switch the RF switch to TX/RX channel before transmitting/receiving (SX127X RXTX/RFMOD: High = TX, Low = RX).
3. Maximum output power: +10 dBm, not exceeding +12 dBm.
4. When dormant with TCXO_EN high, the TCXO oscillator consumes ~2.5 mA. Set TCXO_EN low for true sleep (SX127X config is lost and must be reinitialized on wake).

Dimensions

Schematic

• LilyGo_TBeam_BPF.pdf
• LilyGo-LoRa-Series Hardware

Datasheet

• ESP32-S3 Datasheet
• SX1278 Datasheet

Software Libraries

• LilyGo-LoRa-Series GitHub Repository

Dependent Libraries

• RadioLib
• TinyGPSPlus
• U8g2
• XPowersLib

FAQ

• Q. What is the BPF (Band-Pass Filter)? A. The built-in band-pass filter limits the receivable frequency range to 144–148 MHz VHF, effectively reducing out-of-band interference and improving reception sensitivity in dense RF environments.

• Q. Can it be used for APRS? A. Yes. The 144 MHz VHF band is the standard APRS frequency in most regions, and the BPF is specifically designed for this application.

• Q. The device won't power on after inserting the battery. A. The onboard BMS ships in shipping mode. Connect USB-C to activate. If the battery is removed and reinserted, repeat this step.

• Q. How do I enable PSRAM? A. In Arduino IDE, set PSRAM to OPI PSRAM. In ESP-IDF, enable SPIRAM support in menuconfig.

Changelog

Version	Date	Notes
V1.0		Initial release