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Heltec

Heltec WiFi LoRa 32 V4

Build a USB-powered mesh node or an ESP32 radio experiment.

Mesh networkingRadioBuild & codeMeshtasticLoRa

Availability
Listed
Radio
SX1262 LoRa
Buy$17.90+Heltec

Where to buy · 3 shops

Compare with similar devices

Radio equipment needs certification where you live (FCC, CE, UKCA, ISED, Anatel). Some devices are uncertified or restricted in Brazil. Buyers are responsible for their local law.

Bring along
Band-matched antenna, USB data cable and matching firmware target.
Keep in mind
GNSS and battery are separate; V4 and V4-R8 pin assignments differ.
Source checked · Sep 16, 2026
Heltec WiFi LoRa 32 V4
Image creditMaker image · V4 board · Heltec

(02) Blueprint

What’s published

Schematics published

Heltec publishes a schematic PDF, datasheet, and pin map for each hardware revision; no editable KiCad/Altium source is published.

Design files 3

Source 1

git clone https://github.com/HelTecAutomation/HeltecWiKi.git

Key parts 2

Research notes

Board has two current hardware variants: V4 (ESP32-S3R2, 16MB flash) and V4 R8 (ESP32-S3R8, GPIO differs — see wiki hardware-update-log). Both schematic PDFs verified live (200) on resource.heltec.cn as of 2026-09-27; only the HeltecWiKi markdown/docs repo is on GitHub, the schematic files themselves are hosted on Heltec's resource CDN, not in-repo.

Every link checked 2026-09-27.

Hand this device to your agent. Everything on this page, as clean Markdown and JSON: specs, shops, prices, design files, parts.

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Made the Heltec WiFi LoRa 32 V4? Put the badge on your README; it links here, with every shop that sells it.

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Specifications

Hardware and variants

11
R2 model
ESP32-S3R2; 2 MB PSRAM and 16 MB flash
R8 model
ESP32-S3R8; 8 MB PSRAM and 16 MB flash
Internal memory
512 KB SRAM, 384 KB ROM and 16 KB RTC SRAM in the R2 datasheet
R2 OLED
0.96-inch SSD1315; 128 × 64 pixels
R8 OLED
0.96-inch SSD1315; 128 × 64 pixels in the maker’s R8 datasheet
Display selection
Protected OLED and display-free variants listed
LoRa variants
SX1262; high-band 863–928 MHz and low-band 433–510 MHz variants described
Transmit power
Store: 28 ±1 dBm high-power; 22 dBm low-power
Wi-Fi and BLE
802.11b/g/n up to 150 Mbps; Bluetooth LE 5
Antennas
LoRa IPEX; default 2.4 GHz FPC antenna; external path requires revision-specific resistor selection
GNSS expansion
Eight-pin SH1.25 connector; GNSS receiver is an accessory

Power and assembly

10
USB connection
Native USB-C; V4 removes the V3 CP2102 bridge
Battery input
V4.2 datasheet: 3.3–4.2 V, at least 250 mA supply; SH1.25 two-pin
R8 battery reference
R8 datasheet also specifies 3.3–4.2 V lithium input; SH1.25 two-pin
Solar input
4.7–6 V; SH1.25 two-pin
Power connection rule
Use either USB or the 5 V header input; datasheet permits battery/solar alongside either
Low-power conditions
Datasheet: 20 µA asleep from battery/3.3 V; 2 mA asleep from USB
Board dimensions
51.7 × 25.4 × 10.7 mm
Store temperature range
−20 to 70 °C
Base package
Board, LoRa antenna, two battery/solar connectors and two 18-pin headers
Peripherals
ADC, touch, UART, I²C and SPI; consult the exact revision’s pin map

Revision and firmware setup

9
R2 Meshtastic target
heltec-v4 for OLED; a separate heltec-v4-tft target exists
R8 Meshtastic target
heltec-v4-r8-oled; TFT uses the distinct heltec-v4-r8-tft target
Maker firmware guidance
V4.3: Meshtastic 2.7.20+ or MeshCore 1.15.0+; R8 guidance separately references later-than-2.7.25 firmware
USB download mode
Connect USB, hold PRG, tap RST, release PRG; restart after flashing
R8 development board
Select WiFi LoRa 32 (V4 R8) in the maker’s Arduino setup
R2 amplifier selection
Maker distinguishes USE_GC1109_PA for V4.2 from USE_KCT8103L_PA for V4.3
Current R2 hardware log
V4.3.1 entry changes amplifier control, battery protection and ADC standby circuitry
R8 pin changes
Vext 36→40, GNSS power 34→42, LED 35→46; amplifier control on GPIO5
Development options
Arduino, PlatformIO, ESP-IDF and MicroPython advertised by maker
What still needs checking
  • Match PCB revision, R2/R8 memory variant, radio band and display to firmware. A source target does not establish that every release includes its binary.
  • The store’s generic R8 filename omits the upstream OLED/TFT suffix. Use the exact supported target for the physical board; OLED builds do not imply touchscreen hardware.
  • Battery maximum differs: store 4.4 V, R2 and R8 datasheets 4.2 V. Confirm limits for the exact revision rather than applying the higher value universally.
  • The V4.2 datasheet and store use different temperature ranges and low-power conditions; these are not independent whole-device measurements.
  • R8 datasheet’s revision table is marked internal beta and contains mixed revision labels. Display-free contents and current production revision still require SKU confirmation.
  • Store package-size metadata differs from board dimensions. Battery, GNSS and enclosure inclusion depend on the chosen bundle.
  • R8 MeshCore release availability was not established; the maker page describes temporary firmware pending integration.

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Heltec WiFi LoRa 32 V4Heltec
Buy$17.90+

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