🚀 HELTEC WiFi LoRa 32 V4 – SX1262 LoRa Node for Meshtastic & LoRaWAN The iconic WiFi LoRa 32 development board returns with the all-new V4 version 🎉—featuring refined craftsmanship and upgraded performance ⚙️, while preserving the strengths of previous generations.
🌟 Main Features – HELTEC WiFi LoRa 32 V4
- 🔧Based on ESP32-S3R2 & SX1262, supports Wi-Fi b/g/n, BLE, and LoRa communication
- 🧠2MB PSRAM and 16MB Flash – ideal for UI and complex systems
- 📡LoRa Transmit Power: High-power 28 dBm / Low-power 22 dBm
- 🛡️PC casing protects the screen and integrates FPC 2.4G antenna
- 🔌Form factor and pin compatibility with WiFi LoRa 32 V3
- ☀️Added SH1.25-2Pin solar panel interface and SH1.25-8Pin GNSS interface
- 🔋Optimized lithium battery management
- 🌱Low power consumption: less than 20μA
🚀Hardware Comparison – HELTEC WiFi LoRa 32 V4 vs V3
| Parameters | V3 | V4 |
|---|---|---|
| MCU | ESP32-S3FN8 | ESP32-S3R2 |
| Flash | 8MB (integrated) | 16MB (external) |
| USB to Serial Chip | CP2102 | Removed CP2102 |
| Power Management | Standard Li-ion management IC | Upgraded IC supporting solar input |
| Solar Input | Not available | Added SH1.25-2P interface |
| LoRa TX Power | 21±1dBm | 28±1dBm |
| 2.4G Antenna | Metal spring antenna | FPC antenna + IPEX connector |
| GPS Interface | Not available | Added SH1.25-8Pin interface |
| Peripheral I/F | 36-pin | 40-pin |
| Screen Connection | Soldered | Soldered + B2B connector |
| Pin Craft | Silver-plated | Gold-plated |
| Screen Bracket | Partial protection | Full protection |
✨ Highlights – HELTEC WiFi LoRa 32 V4
⚙️ More Powerful MCU
The WiFi LoRa 32 V4 is powered by the ESP32-S3R2, featuring 2MB PSRAM and 16MB external Flash—a memory upgrade ideal for UI-rich and complex system design, especially in advanced LoRaWAN and Meshtastic deployments.
📡 Higher Transmission Power
Available in both high-power and low-power versions, the WiFi LoRa 32 V4 high-power model delivers up to 27+1 dBm transmit power. This enables longer communication distances and greater adaptability across diverse IoT scenarios.
🔌 More Peripheral Interfaces
-
☀️ Added SH1.25×2 solar panel interface, supports 4.7~6V solar input
-
🛰️ Added SH1.25×8 GNSS interface, with individually controllable GNSS power
-
🔋 Integrated SH1.25×2 lithium battery interface for flexible power options
🔧 Compatible with V3 Pinout
The WiFi LoRa 32 V4 retains the form factor and pin layout of WiFi LoRa 32 V3, while adding extra pins. The pin plating has been upgraded from silver to gold, enhancing durability and conductivity for long-term use.
🛠️Product Details – HELTEC WiFi LoRa 32 V4
Layout
Pin Map
⚙️Specifications – HELTEC WiFi LoRa 32 V4
| Parameters | Description |
|---|---|
| MCU | ESP32-S3R2 (Xtensa®32-bit lx7 dual core processor) |
| LoRa Chip | SX1262 |
| Frequency | High-power version: 863-928MHz Low-power version: 433, 470-510, 863-928MHz |
| Max. TX Power | High-power version: 28 ±1 dBm Low-power version: 21 ±1 dBm |
| Max. Receiving sensitivity | -137dBm@SF12 BW=125KHz |
| Wi-Fi | 802.11 b/g/n, up to 150Mbps |
| Bluetooth | Bluetooth (LE), Bluetooth 5, Bluetooth Mesh |
| Hardware Resource | 7*ADC1 + 2*ADC2; 7*Touch; 3*UART; 2*I2C; 2*SPI; etc. |
| Memory | 384KB ROM; 512KB SRAM; 16KB RTC SRAM; 2MB PSRAM; 16MB Flash |
| Interface | Type-C USB; SH1.25*2 Pin lithium battery interface; SH1.25*8 Pin interface; LoRa ANT(IPEX1.0); 2.4G ANT(IPEX1.0) |
| Battery applicable | 3.3-4.4V lithium battery |
| Operating Temperature | -20 ~ 70 ℃ |
| Dimensions | 51.7 * 25.4* 10.7mm |
🔗Docs & Resource
- [Docs] — User Manual
- [Attachment] — Schematic diagram
- [Attachment] — Datasheet
- [Attachment] — 3D Model Diagram
- [Resource] — Downloadable Resources
- [Resource] — Heltec ESP32 Development Framework (Board Manager, Basic Examples)
- [Resource] — Heltec ESP32 Extension Libraries (LoRa/LoRaWAN, Sensors, etc.)
📦Packing list
The default packing list without selecting any accessories is as follows:
| Item | Quantity |
|---|---|
| WiFi LoRa 32 (V4) | x1 |
| LoRa Antenna | x1 |
| SH1.25×2 Connector (for battery&solar) | x2 |
| 2.54*18 Header Pin | x2 |
| 2.54*2 Header Pin | x2 |
| GPS module | x1 |
❓ FAQ – WiFi LoRa 32 V4
📡 2.4GHz Antenna
The default 2.4G FPC antenna of the WiFi LoRa 32 V4 is located on the side of the plastic screen bracket.
If you wish to use an IPEX-connected 2.4G antenna, remove the inductor marked ① and add a 0-ohm resistor (or conductive metal/cable) at position ② to connect to the IPEX interface.
💻 Development Methods Supported
- ✅ Arduino (recommended)
- 🐍 MicroPython
- ⚙️ Platform.io
- 🧠 Espressif IDE
We strongly recommend using Arduino for WiFi LoRa 32 V4. Full technical support and LoRaWAN code for ESP32 Arduino framework is available.
🔋 Battery Socket Type
The WiFi LoRa 32 V4 uses a socket type commonly found by searching “SH1.25 x 2”.
🖥️ OLED-Free Version
Yes, you can order a version of WiFi LoRa 32 V4 without the OLED display. Just contact our sales staff with your request.
🔄 V3 and V4 Compatibility
WiFi LoRa 32 V4 is compatible with V3 in most scenarios. It uses the same chip series, OLED, and nearly identical pin layout. However, due to increased transmit power, some code settings may need adjustment to match actual output.
⚠️ Code Upload Issues
Please try the following steps:
- Use a different USB cable.
- Enter BootLoader mode using one of these methods:
- Hold down the PRG button, connect the USB-C cable, then release the PRG button.
- Connect the USB-C cable, hold down the PRG button, press the RST button once, then release the PRG button.