SPECIFICATIONS

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Heltec WiFi LoRa 32 V4 | ESP32-S3 LoRa Development Board Upgrade | Long Range
IoT Communication

Docs & Resource

Summary
Heltec WiFi LoRa 32 V4 is a fully upgraded version of the classic LoRa development board. Since its
initial launch in 2017, this product series has been highly favored by developers and makers. Building
upon the powerful features of its predecessors, the V4 version introduces comprehensive optimizations
in Transmit Power, power management, expandability and other hardware design. It is suitable for
various IoT applications such as smart cities, agricultural monitoring, smart homes, industrial control,
security systems, and wireless meter reading, providing developers with a more efficient and flexible
development experience.

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 .
High-power version with LoRa transmission power increased to 27±1dBm.
Form factor and pin compatibility with WiFi LoRa 32 V3.
PC casing protects the screen and integrates FPC 2.4G antenna.
Added SH1.25-2P solar panel interface.
Optimized lithium battery management.
Added SH1.25-8Pin GNSS interface.
USB Type-C interface with integrated voltage regulation, ESD protection, short-circuit protection,
and RF isolation design.
Low power consumption is less than 20μA.
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;
SH1.25*2 Pin lithium battery interface;
SH1.25*8 Pin interface;
LoRa ANT(I-PX1.0);
2.4G ANT(I-PX1.0)
Battery applicable
3.3-4.4V lithium battery
Operating Temperature
-20 ~ 70 ℃
Dimensions
51.7 * 25.4* 10.7mm
FAQ
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 I-PX-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 I-PX interface.

2What 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.
3What’s the battery socket type?
You can find this type of socket by search “SH1.25 x 2”.
4Can I order a version without the OLED display?
Of course, you can contact our sales staff and provide your ideas.
5Are 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.
6Failed 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.