Heltec WiFi LoRa 32 (V3)
Modern, MeshCore-ready ESP32-S3 board with LoRa, BLE 5, and OLED display.
Companion Radio Firmware
Repeater
Room Server
MCU
ESP32-S3FN8 (Dual-core Xtensa LX7)
Flash
8MB SiP
LoRa Chip
SX1262
Connectivity
Wi-Fi 802.11 b/g/n, BLE 5, LoRa
USB
Type-C (with CP2102)
Antenna
u.FL (IPEX1.0)
Battery
3.7V Li-ion w/ charging circuit
Dimensions
50.2 × 25.5 × 10.2 mm
Key Features
Display
Bluetooth
Buttons
Deep Sleep
GPS
Battery Charging
Low Power Modes
Implementation Notes
- Same pinout as LoRa32 V2 for backward compatibility
- Ideal for smart city, farm, home automation, and industrial mesh networking
- Onboard OLED over I2C (GPIO21: SDA, GPIO22: SCL)
- Powered via USB-C or 3.7V lithium battery
Wiring Diagram
Heltec WiFi LoRa 32 (V3)
OLED Display
LoRa Antenna
GPIO21
SDA (I2C)
GPIO22
SCL (I2C)
GPIO26
LoRa Reset
GPIO18
LoRa CLK
Detailed Specifications
| Parameter | Description |
|---|---|
| Master Chip | ESP32-S3FN8 (Xtensa® 32-bit LX7 Dual Core Processor) |
| LoRa Node Chip | SX1262 |
| USB to Serial Chip | CP2102 |
| Frequency Range | 470–510MHz, 863–928MHz |
| Max TX Power | 21±1dBm |
| Max RX Sensitivity | -134dBm @ SF12 BW=125KHz |
| Wi-Fi | 802.11 b/g/n, up to 150Mbps |
| Bluetooth | Bluetooth 5 (LE) |
| Hardware Resources | 7 × ADC1, 2 × ADC2, 7 × Touch, 3 × UART, 2 × I2C, 2 × SPI, etc. |
| Memory | 384KB ROM, 512KB SRAM, 16KB RTC SRAM, 8MB Flash |
| Interfaces | Type-C USB, 2 × 1.25 battery connectors, LoRa ANT (IPEX1.0), 2 × 18 2.54mm pins |
| Battery Support | 3.7V lithium battery with onboard charging |
| Operating Temperature | -20°C ~ 70°C |
| Dimensions | 50.2 × 25.5 × 10.2 mm |
Summary
The Heltec WiFi LoRa 32 V3 is a next-gen IoT board tailored for mesh networking. It supports:
- High-efficiency wireless comms (Wi-Fi, BLE, LoRa)
- Full compatibility with previous Heltec V2 boards
- Smart power management with Li-ion charging
- Versatile for MeshCore deployments in any environment — indoor or out