SPECIFICATIONS

Accessory Type: Extension Board

Battery Included: no

Bluetooth: Bluetooth LE, Bluetooth 5, Bluetooth mesh

Brand Name: Heltec Automation

Choice: yes

Compatible With: Heltec V4

Dimensions: 51.7 * 25.4* 10.7mm

Frequency: 863~928 MHz

High-concerned chemical: None

LoRa Chip: SX-1262

Master Chip: ESP32-S3R2

Max. Receiving Sensitivity: -137 dBm

Max. TX Power: 28±1dBm

OLED: SSD1315(0.96Inch, 128*64 resolution)

Operating Temperature: -40~85℃(OLED operating temperature: -40~ 70°C)

Power Supply: 5V@USB, 3.3-4.2V@Battery

Typical Application Fields: Internet of Things (IoT)

Wi-Fi: 802.11 b/g/n, up to 150Mbps

Docs & Resource

Specifications

Parameters	Description
Master Chip	ESP32-S3R2
LoRa Chip	SX-1262
USB to Serial Chip	CP2102
Frequency	470~510MHz, 863~928MHz
Max. TX Power	21±1dBm, 27±1 dBm
Max. Receiving sensitivity	-137 dBm
Wi-Fi	802.11 b/g/n, up to 150Mbps
Bluetooth	Bluetooth LE, Bluetooth 5, Bluetooth mesh
OLED	SSD1315(0.96Inch, 128*64 resolution)
Power Supply	5V@USB, 3.3-4.2V@Battery
Hardware Resource	7*ADC1 + 2*ADC2, 7*Touch, 3*UART, 2*I2C, 2*I2S 4*SPI, etc.
Memory	384KB ROM; 512KB SRAM; 16KB RTC SRAM; 16MB Flash, 2MB PSRAM
Interface	USB Type-C; SH1.25-2P lithium battery interface; SH1.25-2P solar panel interface; 2*IPEX1.0 ANT(LoRa&2.4G); 2*18*2.54 Header Pins, 2*2*2.54 Header Pins
Operating Temperature	-40~85℃(OLED operating temperature: -40~ 70°C)
Dimensions	51.7 * 25.4* 10.7mm

Summary

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, Platform IO, 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.

 

Main Features

Engineered with Advanced ESP32-S3 & LoRa SX1262 Chips

• Meet the brain of your next project: our fully upgraded Heltec WiFi LoRa 32 V4 development board.

       At its core lies the powerful ESP32-S3R2 dual-core processor, a significant leap from older ESP32

       versions. Paired with the robust Semtech SX1262 LoRa transceiver, this combination delivers

       unparalleled processing power and efficient long-range communication.

• With generous 2MB PSRAM and 16MB external Flash memory, it effortlessly handles complex code,

       sophisticated user interfaces, and extensive IoT device data, ensuring smooth and responsive

       performance for your most demanding applications.

27dBm High Power Transmission for Unmatched LoRa Range

• Push the boundaries of wireless communication. Our V4 development board boasts a massive

       27±1dBm transmit power and an exceptional -137dBm receiving sensitivity. This means you can

      build Meshtastic devices and LoRa radio networks that reach farther and connect more reliably than

      ever before.

• Whether you're covering a smart farm, a large industrial facility, or an urban neighborhood, our

      board ensures your data packets get through, making it the ultimate solution for long-range, low-

     power applications.

Advanced Solar Charging & Ultra-Low Power Management

• Designed for 24/7 outdoor and off-grid operation. We've revolutionized the power management

       system, featuring an ultra-low deep sleep current of less than 20μA for years of battery life.

• The dedicated solar panel interface allows you to harness the sun's energy, creating self-sustaining

        Meshtastic solar nodes for permanent outdoor installations. The optimized lithium battery

        management ensures safe and efficient charging, making it perfect for asset tracking and remote

        monitoring.

GNSS Port for GPS Connectivity & Accurate Tracking

• Add precise geolocation to your IoT devices with ease. The V4 introduces a dedicated SH1.25-8P

       GNSS interface, designed for plug-and-play connectivity with external GPS modules (not included).

• This critical feature enables high-accuracy asset tracking, vehicle monitoring, and any application

       requiring exact location data. Build sophisticated Meshtastic GPS nodes that don't just communicate

       but also know exactly where they are.

Pin-to-Pin Compatible with Popular V3 Design

• Upgrade your projects without redesigning your hardware. The LoRa 32 V4 maintains full pin-to-pin

       compatibility with the widely adopted Heltec LoRa 32 V3, protecting your investment in existing

      shields and accessories.

• The familiar layout, combined with expanded interfaces, makes migration seamless. Jump into

       development immediately with support for Arduino and PlatformIO, accelerating your path from

       concept to functional IoT prototype.

Hardware Version Comparison

FAQ

1.12.4GHz Antenna

      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.

2.What development methods does it support?

       ●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.

3.What’s the battery socket type?

      You can find this type of socket by search “SH1.25 x 2”.

4.Can I order a version without the OLED display?

      Of course, you can contact our sales staff and provide your ideas.

5.Are V3 and V4 compatible?

      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.

6.Failed to upload code

      Please try the following steps:

      1.Try using a different USB cable.

      2.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.