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The Heltec WiFi LoRa 32 V4, more commonly known as the Heltec V4, is a development board based around the ESP32-S3 microcontroller and the SX1262 LoRa transceiver. It features a 505 mW increase in output power over its predecessor, the Heltec V3, along with additional memory and a solar panel connector.

• Models

• Firmware

• References

• External links

There are two models of the Heltec V4. The HTIT-WB32LAF is the original model and features the ESP32-S3R2 microcontroller with 2 MB of PSRAM. The newer HTIT-WBR8H features the ESP32-S3R8 microcontroller with 8 MB of PSRAM. This newer model is also known as the Heltec V4-R8, and was likely introduced due to the ESP32-S3R2 becoming end-of-life.

The Heltec V4 is supported by the official RNode firmware as of version 1.84.cite-ref-1[1] It is also supported by the microReticulum firmware as of version 1.85.10.cite-ref-2[2]

cite-note-11. ↑ "Release 1.84".

cite-note-22. ↑ "Release 1.85.10".

• Official website

• WiFi LoRa 32 V4 datasheet

• WiFi LoRa 32 V4-R8 datasheet

Also known as: Heltec V4

Manufacturer: Heltec Automation

Type: Development board

Price: US$17.90

MCU: ESP32-S3R2 or S3R8

CPU: Xtensa LX7 @ 240 MHz

Memory: 512 kB SRAM 2 or 8 MB PSRAM 16 MB Flash

Display: 0.96-inch OLED 128 × 64 px

GNSS: External L76K

Power source: 5 V USB Type-C 3.7 V Li-ion Battery 6 V Solar Panel

Dimensions: 51.7 × 25.4 × 10.7 mm

Predecessor: Heltec WiFi LoRa 32 V3

Transceiver IC: ESP32-S3R2 or S3R8

PHY modes: 2M, Coded

Output power: 20 dBm (100 mW)

Sensitivity: -98 dBm @ 1 Mbps

Antenna type: Shared FPC Shared External u.FL

Transceiver IC: ESP32-S3R2 or S3R8

PHY modes: IEEE 802.11b/g/n

Output power: 21 dBm (125 mW)

Sensitivity: -98 dBm @ 1 Mbps

Antenna type: Shared FPC Shared External u.FL

Transceiver IC: SX1262

PHY modes: FSK, LoRa, LR-FHSS

Frequency range: 863–928 MHz

Output power: 28 dBm (630 mW)

Antenna type: External u.FL