2PCS Heltec V4 LoRa32 ESP32-S3 SX1262 LoRaWAN 868MHz Development Board With 0.96 Inch OLED WiFi & BLE Mesh Network for IoT

Note： Version 4.3

Please ensure your board enters Bootloader mode before flashing. Here’s how:

Connect the USB-C cable, then hold down the PRG button, press the RST button once, and release the PRG button. After that, flash the firmware. Once the flashing is complete, remember to restart the device.

Hardware version 4.3 requires new firmware.

If you are using Heltec’s development framework, please update the board package and LoRa library to the latest via GitHub.

Meshtastic, please use firmware version 2.7.20 or above. Please note: “Meshtastic UI” is for use with the touchscreen. For ordinary OLED screens, please do not select it.

MeshCore, please use firmware version 1.15.0 or above.

Specifications

Layout

Pin Map

Packing List

FAQ

1.“LoRa Error”

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.

2.Failed to flash firmware or upload code.

Enter BootLoader mode: Connect the USB-C cable, hold down the PRG button, press the RST button once, then release the PRG button.

Replace a USB data cable.

Change the port on the computer.

3.Firmware for V4.3.

Hardware version 4.3 requires new firmware.

Schematic of V4.3, please consult customer service

If you are using Heltec’s development framework, please update the board package and LoRa library to the latest via GitHub.

Meshtastic, please use firmware version 2.7.20 or above.

MeshCore, please use firmware version 1.15.0 or above.

4.Enable or Disable LNA.

Note: The following content only applies to hardware V4.3 and above

Meshtastic 2.7.20: On the device, use the PRG button to navigate to “System” → “LoRa”, where you can choose to enable or disable LNA.

MeshCore 1.15.0: LNA is enabled by default and cannot be modified.

 You can download the firmware from this link, which has LNA disabled by default: The link cannot be displayed. Please consult customer service

With the firmware from this link, LNA can be toggled via button long press: The link cannot be displayed. Please consult customer service

 We have submitted a PR. In the near future, official firmware will also support toggling LNA via command line or button.

5.The screen does not display.

Please note: “Meshtastic UI” is for use with the touchscreen. For ordinary OLED screens, please do not Select it.

6.Why are there no resistors soldered on the 868 and 915 markings? Which frequency band does my device actually support?

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.