Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)

Development Board

Code name: heltec_wifi_32_lora_V3

Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3) is a development board based on the ESP32S3 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 8MB flash memory.

About Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)

Similar to the WiFi Kit 32 but with additional features for LoRaWAN applications, providing long-range wireless communication.

Technical Specifications

Complete technical specification details for Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)

Display

Type OLED

Size 0.96"

Resolution 128x64

USB

Type USB-C

Serial Chip CP2102

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

LoRa X1262

Microcontroller

Model esp32s3

Clock Speed 240 MHz

Flash Size 8MB

SRAM 512KB

PSRAM 8MB

Architecture xtensa

✨ Features & Pins

Digital IO 48

Analog Input 20

PWM 27

Interrupts 46

Download Full Datasheet

Quick Setup

Copy-paste configs for Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3) - auto‑generated from this board's exact hardware specs.

ESP32S3 240 MHz 8MB DIO Xtensa

In Arduino IDE 2 select Heltec Wifi 32 Lora V3 from the esp32 by Espressif package. In PlatformIO use board = esp32-s3-devkitm-1. ESP32S3 · 240 MHz · 8MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Heltec Wifi 32 Lora V3

CPU Frequency 240 MHz

Flash Size 8MB

Flash Mode DIO

Upload Speed 921600

Architecture Xtensa

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Heltec Wifi 32 Lora V3" for the Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3).

platformio.ini


[env:heltec_wifi_lora_32_V3]
platform  = espressif32
board     = esp32-s3-devkitm-1
framework = arduino

; Exact hardware config for Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)
board_build.mcu        = esp32s3
board_build.f_cpu      = 240000000L
board_build.flash_size = 8MB
board_build.flash_mode = dio
board_upload.flash_size = 8MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32-s3-devkitc-1
  framework:
    type: arduino   # or "esp-idf"

# Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3) - 240 MHz ESP32S3
# Flash: 8MB | USB: USB-C

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32s3 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 8MB \
    0x0 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x0

Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3) Pinout Diagram

Complete pin reference for Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)

Useful Links

Datasheets and resources for Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)

Board Datasheet

Technical specifications

ESP32S3 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
1	A0	T1	PWM
2	A1	T2	PWM
3	A2	T3	PWM
4	A3	T4	PWM
5	A4	T5	PWM
6	A5	T6	PWM
7	A6	T7	PWM
8	A7	T8	PWM	SS
9	A8	T9	PWM	SCK
10	A9	T10	PWM	MOSI
11	A10	T11	PWM	MISO
12	A11	T12	PWM
13	A12	T13	PWM
14	A13	T14	PWM
15	A14		PWM
16	A15		PWM
17	A16		PWM	SDA_OLED
18	A17		PWM	SCL_OLED
19	A18		PWM
20	A19		PWM
21			PWM	RST_OLED
35			PWM	LED
36			PWM	Vext
41			PWM	SDA
42			PWM	SCL
43			PWM	TX
44			PWM	RX
48				LED_BUILTIN

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3)

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x0`
Flash mode	dio
Boot mode	qio
PSRAM type	qspi
Maximum upload size	3264 KB (3342336 bytes)
Maximum data size	320 KB (327680 bytes)

Configuration Summary

The Heltec WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3) uses esptool_py for uploads , esp_ota for OTA updates, and esptool_py bootloader at 0x0.

Flash mode: dio | Boot mode: qio | PSRAM: qspi

Max sketch size: 3264 KB | Max data size: 320 KB