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Heltec

WiFi LoRa 32 v4 902-928 MHz Band with case

WiFi LoRa 32 v4 902-928 MHz Band with case

$75.00 AUD
$75.00 AUD
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WiFi LoRa 32(V4), ESP32S3 + SX1262 LoRa Node, Meshtastic and LoRaWAN Compatible

WiFi LoRa 32 is a classic IoT development board widely used in many open-source projects and IoT products.

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, 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.
  • Optimised 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

More Powerful MCU - The ESP32-S3R2 offers 2MB of PSRAM and is equipped with an external 16MB Flash, making the upgraded memory configuration more suitable for Ul and complex system design.

Higher Transmission Power - The device is available in high-power and low-power versions. The high-power version offers a transmit power of up to 27±1dBm, enabling longer communication distances and adaptability to a wider range of application scenarios.

More Peripheral Interfaces

  • Added 1.25*2P solar panel interface, supports 4.7~6V solar input
  • Added 1.25°8P GNSS interface, GNSS power can be individual controlled.
  • 1.25*2P lithium battery interface

Compatible with V3 Pinout

Almost entirely retains the form factor and pin layout of V3, while adding additional pins. The pin plating process has been upgraded from silver plating to gold plating.

Specfications

 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

2.4GHz Antenna

The default 2.4G FPC antenna is located on the side of the plastic screen bracket.

Hardware 4.2
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.

My screws look a bit odd?

This area is attached with a 2.4G FPC antenna, and to avoid affecting its performance, customised 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. Heltec 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”.

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:

  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.

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.

It does not indicate device damage. Please disregard this phenomenon. The LORA ERROR occurs because it is running the factory default LORA testing program and cannot find another device running the same program.

Links

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