Heltec WiFi LoRa 32 V4 – 868 MHz with OLED
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Heltec WiFi LoRa 32 V4 – 868 MHz with OLED
0,00 kr
Heltec WiFi LoRa 32 V4 – 868 MHz with OLED
A small development board for large wireless projects! Heltec WiFi LoRa 32 V4 combines ESP32-S3, SX1262 LoRa radio, WiFi and Bluetooth LE with a 0.96" OLED display.
This version is for 868 MHz projects and gives you a compact platform for Meshtastic, LoRaWAN and your own IoT solutions. The display can show status and information from your project, while USB-C makes it easy to program the board.
The board has connections for a lithium battery, solar panel and a separate GNSS module. One board with LoRa antenna is included. GNSS module, battery and solar panel are sold separately.
Use firmware for Heltec V4, which is compatible with the print revision, and select the EU_868 region in Meshtastic. Connect the antenna before transmission, and adjust the transmit power to your application and the applicable frequency regulations.
ESP32-S3R2 has two 32-bit cores with up to 240 MHz, 512 KB SRAM, 2 MB PSRAM and 16 MB flash. The OLED screen uses SSD1315 and displays 128 × 64 pixels. You can connect sensors via UART, I²C or SPI, but some GPIO signals are already used by the radio, display and memory.
Power consumption changes significantly with the operating mode: sleep on battery is around 20 µA in the manufacturer's test, while LoRa transmission can require several hundred milliamperes. The sleep figure therefore does not describe the consumption of a constantly listening Meshtastic node. The battery and power supply must be able to handle the transmit pulses.
Print revision and processor variant affect the firmware. This product description applies to the R2 version with 2 MB PSRAM. The R8 version and different V4 revisions may have different pin functions. The OLED is removable via the board's connector; GNSS is added with a separate L76K module.
Technical specifications
| Microcontroller | ESP32-S3R2, dual-core Xtensa LX7 |
| LoRa radio | Semtech SX1262 |
| LoRa frequency | 868 MHz; radio frequency range 863-928 MHz |
| Flash memory | 16 MB |
| PSRAM | 2 MB |
| Display | 0.96" OLED |
| WiFi | 2.4 GHz, 802.11 b/g/n |
| Bluetooth | Bluetooth LE / Bluetooth 5 |
| USB | USB-C |
| Maximum hardware transmit power | 28 ± 1 dBm; operating power must be set for the application |
| Battery connection | SH1.25, 2-pin; single-cell lithium battery, 3.3-4.2 V according to datasheet |
| Solar input | SH1.25, 2-pin; 4.7-6 V |
| GNSS connection | SH1.25, 8-pin; GNSS module purchased separately |
| LoRa antenna jack | IPEX1 / U.FL |
| Dimensions | 51.7 × 25.4 × 10.7 mm |
| Operating temperature | -20 to +70 °C |
| CPU clock | Up to 240 MHz |
| SRAM / ROM | 512 KB SRAM / 384 KB ROM |
| RTC memory | 16 KB RTC SRAM |
| OLED controller and resolution | SSD1315, 128 × 64 pixels |
| GPIO logic | 3.3 V; use appropriate level shifting for 5 V signals |
| UART / I²C | 3 × UART / 2 × I²C on MCU; some signals are used by the board |
| Analog and touch functions | 7 × ADC1 + 2 × ADC2 as well as 7 touch signals according to the board's specification |
| OLED signals | SDA GPIO17, SCL GPIO18, reset GPIO21 (R2 version) |
| Header pitch | 2.54 mm; 2 × 18 pins as well as an extra 2 × 2 pins |
| LoRa receiver sensitivity | Up to -137 dBm at SF12, 125 kHz bandwidth |
| USB power | 5 V nominal; dimension the power supply for the radio load |
| Sleep on battery | Approx. 20 µA, manufacturer's measurement at 25 °C |
| Sleep via USB | Approx. 2 mA, manufacturer's measurement at 25 °C |
| LoRa RX current | Approx. 75 mA under the manufacturer's test conditions |
| LoRa TX current at 868 MHz | Approx. 290 mA at 14 dBm and 750 mA at 27 dBm, USB powered, 25 °C |
| Firmware platforms | Arduino, ESP-IDF, PlatformIO and MicroPython |
| GNSS power management | Separate power management for the GNSS connection; GNSS module is an accessory |
What is in the package?
- 1 × Heltec WiFi LoRa 32 V4 with OLED display
- 1 × LoRa antenna for 868 MHz
- Connection cables for battery/solar panel and pin headers
NOTE: GNSS module, battery, solar panel and USB-C cable are not included.
Manufacturer's documentation · Heltec V4 datasheet and pin overview
Warranty and shipping
We do our best to test all electronics before we ship them out to you. If there are problems with the ordered equipment, you can always contact us, and we will help you solve the problem.
We ship from Aarhus to Denmark and Sweden. Shipping options and price are shown at checkout. Delivery time depends on stock status, destination and shipping method; contact us before purchase if you have a specific deadline.
