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Description
Characteristics
3 Reviews
Description
The WiFi LoRa 32 V4, the next gen to the Heltec V3, is a powerful, high-efficiency IoT maker board featuring an ESP32S3 MCU and SX1262 LoRa Node chip; retaining the V3’s size and identical pinout, it integrates performance upgrades including a built-in Wi-Fi/Bluetooth antenna, 28±1dBm LoRa output power, and a protected OLED display; its superior RF and stable system design ensure it’s ready-to-use and highly beginner-friendly, supporting development via Arduino, PlatformIO, ESP-IDF, and MicroPython; making it ideal for long-range wireless open-source projects like Meshtastic, LoRaWAN, and Meshcore in applications such as smart cities and industrial control, with custom hardware available on the Heltec MQB platform.
Main Features
- Base on ESP32-S3R2 & SX-1262, supports Wi-Fi b/g/n, BLE, and LoRa communication.
- 2MB PSRAM and 16MB external Flash, more suitable for UI and complex system.
- LoRa Transmit Power: High-power version 28 dBm, Low-power version 22 dBm
- PC casing protects the screen and integrates FPC 2.4G antenna.
- Form factor and pin compatibility with WiFi LoRa 32 V3.
- PC casing protects the screen and integrates FPC 2.4G antenna.
- Added 1.25-2Pin solar panel interface, and 1.25-8Pin GNSS interface.
- Optimized lithium battery management.
- Low power consumption is less than 20μA.
Hardware Version Comparison
| 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 1.25-2P interface |
| LoRa TX Power | 21±1dBm | 28±1dBm |
| 2.4G Antenna | Metal spring antenna | FPC antenna + IPEX connector |
| GPS Interface | Not available | Added 1.25-8Pin 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 |
Highlight
Product Details
Layout
Pin Map
Specifications
| 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; 1.25*2 Pin lithium battery interface; 1.25*2 Pin Solar interface; 1.25*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 |
FAQ
Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, United Kingdom
South:
Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia
Midwest:
Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, Pennsylvania, South Dakota, Wisconsin
West:
Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming
Northeast:
Connecticut, District of Columbia, Maine, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, Vermont
Not Supported:
Alaska, Hawaii, Puerto Rico
The default 2.4G FPC antenna is located on the side of the plastic screen bracket.
If you wish to use an IPEX-connected 2.4G antenna, you need to remove the inductor marked as ① in the diagram below, and add a 0-ohm resistor (or other conductive metal or cable) at the position marked ② to connect to the IPEX interface.
This area is attached with a 2.4G FPC antenna,and to avoid affecting its performance, customized plastic screws are used here.
That’s why they look different from ordinary screws.
When you need to remove it, gently press and turn with a screwdriver.
- Arduino
- Micro Python
- Platform.io
- Espressif IDE
We strongly recommend using Arduino. We have complete technical support and provide complete LoRaWAN code for ESP32 Arduino framework.
You can find this type of socket by search “SH1.25 x 2”.
Of course, you can contact our sales staff and provide your ideas.
They are compatible in most scenarios.
Since V4 uses the same series of chips as V3, features the same OLED, and has an almost identical pin layout, V3 and V4 can be used interchangeably in the majority of cases.
However, due to the increased transmit power, the transmit power settings in some code may no longer correspond directly to the actual output.
Please try the following steps:
Try using a different USB cable.
Enter BootLoader mode. There are two methods to enter this mode:
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.
It indicates simultaneous support for both 868 MHz and 915 MHz frequency bands.
In the initial design, we developed two separate hardware versions to achieve optimal RF performance. However, through subsequent debugging, we have successfully unified the hardware for both 868 MHz and 915 MHz while maintaining excellent RF characteristics.
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 |
| 1.25×2 Connector (for battery&solar) | x2 |
| 2.54*18 Header Pin | x2 |
| 2.54*2 Header Pin | x2 |
Characteristics
| Weight | 35 g |
|---|---|
| Dimensions | 6.6 × 6.6 × 2 cm |
| LoRa Band | 863~870MHz, 902~928MHz |
| Display | OLED, No Display |
| Transmission Power | 28dbm |
| Warehouse | CN (China) Warehouse, DE (Germany) Warehouse, US (United States) Warehouse |
3 Reviews
WiFi LoRa 32(V4), ESP32S3 + SX1262 LoRa Node, Meshtastic and LoRaWAN Compatible
What's this?
The all-new V4 version of the classic ESP32+LoRa development board WiFi LoRa 32.
- The US (United States) Warehouse ships within the United States only(Click for Details).
- The DE (Germany) Warehouse can ship to the UK and continental Europe(Click for Details).
Price range: $17.90 through $19.90
Dave Jones (verified owner) –
General Overview:
-The WiFi LoRa 32 (V4) delivers transmit power up to 28 ± 1 dBm.
-According to Heltec’s published testing, the V4 offers improved receiver sensitivity compared to earlier models.
-Includes expanded memory, featuring 2 MB PSRAM and 16 MB external Flash.
-Supports Wi-Fi (802.11 b/g/n), Bluetooth LE / BT5 / Mesh, and LoRa connectivity.
-Offers a solar input port.
-Features a plug-and-play GNSS (GPS) interface on the underside of the board.
-Meshtastic firmware v2.7.13 provides full compatibility, and VNA testing has confirmed the board achieves its advertised transmit power using this firmware or greater.
When I purchased the WiFi LoRa 32 (V4) it was my first Heltec device after previously using LilyGO hardware. I was pleasantly surprised by the overall build quality. It’s clear that Heltec put some thought into the design, especially its compatibility with their optional WiFi LoRa 32 Expansion Kit.
I currently own two V4 units: one serves as a home base station connected to a rooftop antenna, and the second will likely become a portable node I carry with me. I’m also possibly considering using one in a solar-powered weather station project next summer. I would have to say this is a must have for beginners. Well there is always room from improvement like using a next generation radio, it checks most of the boxes meshtastic users currently require.
My experience buying directly from Heltec wasn’t perfect there were shipping delays during the initial launch week but customer service was responsive and the devices did arrive. For anyone ordering during high-demand periods like a devices day one launch, I’d keep in mind you should expect delays, or use third-party resellers like AliExpress or Amazon for potentially faster delivery.
Common User-Reported Issues:
-Some users would have preferred Heltec reversed the Battery and Solar connectors for better case compatibility; however this is a personal preference and as it stands does not affect device functionality.
-Due to GPIO layout changes relative to the previous WiFi LoRa 32 (V3), not all third-party accessories are backward compatible.
-Many V3 enclosures are not compatible with the V4 because of dimensional changes particularly because of the addition added OLED faceplate.
Info –
The correct email address is [email protected]
Tom Milledge (verified owner) –
I live in the U.S. I ordered 4 of the 902~928MHz band V4s and received 4 863-870MHz band V4s. I’ve sent two emails to [email protected] and still no response.