Description
Some networks end at the router. LoRa begins where the router stops: across a farm, through a warehouse, along a coastline, over three kilometers of open ground. The Field Link is a WiFi LoRa 32 V3 development board from Heltec Automation, pairing a dual-core ESP32-S3 processor with an SX1262 LoRa transceiver and a 0.96 inch 128x64 OLED display, so a single board can sense, compute, display, and transmit without a second device in sight.
The engineering story is in the details. The ESP32-S3FN8 runs two Xtensa LX7 cores at up to 240 MHz, with 4 MB of flash and support for Wi-Fi 802.11 b/g/n, classic Bluetooth and BLE, all in one package. The LoRa side reaches a receiver sensitivity of -139 dBm at SF12 with a 125 kHz bandwidth, which is how the board sustains long-range links on milliwatts of power. A Type-C USB interface with ESD protection, short-circuit protection, and RF shielding keeps the board honest in the field, not just on the bench.
For developers, the path from idea to deployment is short: full Arduino support, LoRaWAN protocol source code for ESP32, 29 general-purpose GPIOs, 12-bit ADC, 8-bit DAC, three UARTs, two SPI, two I2C, and a CP2102 USB bridge. It is the board you reach for when the project has to leave the desk and survive the real world, from smart agriculture to industrial telemetry.
Every Field Link ships with the antenna, the documentation, and the software resources you need to boot your first LoRa packet within an evening. The board runs cool, the OLED gives you instant feedback on link status and packet counts, and the Type-C connector means one cable works for power, programming, and serial debugging. For teams, the consistent pinout across V2 and V3 keeps existing carrier boards and enclosures reusable across hardware revisions.
This is not a development board. It is a field radio with a keyboard attached to your imagination.
Key Features
- ✦ Dual-core ESP32-S3 (2x Xtensa LX7, up to 240 MHz) with 4 MB flash
- ✦ SX1262 LoRa node chip for 868-915 MHz long-range radio links
- ✦ 0.96 inch 128x64 OLED display for on-device status and data
- ✦ Wi-Fi 802.11 b/g/n plus classic Bluetooth and BLE dual mode
- ✦ Type-C USB with ESD protection, short-circuit protection, and RF shielding
- ✦ Onboard SH1.25-2 battery interface with lithium battery management
- ✦ 29 general-purpose GPIOs, 12-bit ADC, 8-bit DAC, 3x UART, 2x SPI, 2x I2C
- ✦ Full Arduino support and LoRaWAN protocol source code provided
Technical Specifications
- MCU: ESP32-S3FN8, dual-core Xtensa LX7, up to 240 MHz
- LoRa chip: SX1262 (V3) / SX1276 (V2)
- Frequency bands: 868-915 MHz, 923 MHz (EU 863-870, US 902-928)
- Receiver sensitivity: -139 dBm (SF12, BW125kHz)
- Display: 0.96 inch 128x64 OLED
- Flash: 4 MB SPI flash (32 Mbit)
- Working voltage: 3.3V - 7V
- Operating temperature: -40 to 80 C
- USB bridge: CP2102, Type-C interface
- Antenna: IPEX connector, external LoRa antenna included
- Open communication distance: Up to 3 km line of sight
- Processing power: Up to 600 DMIPS
Who It Is For
The Field Link is the backbone of projects that refuse to stay indoors: soil moisture sensors reporting from the far end of an orchard, water meters whispering readings from utility cabinets, air quality nodes scattered across a city block, and warehouse trackers that outlast a shift without a charge. Makers use it to build LoRaWAN gateways and weather stations; engineers use it to prototype industrial control links; students use it to learn radio fundamentals with hardware that documents itself on the OLED. Wherever Wi-Fi gives up, this board keeps talking.
Frequently Asked Questions
Q: What frequency band should I choose?
Choose 433-510 MHz for regions using sub-GHz ISM bands in that range, or 863-928 MHz for EU and US LoRa allocations. The V3 variant covers 868-915 MHz with the SX1262 chip.
Q: Does it support Arduino?
Yes. The board is fully supported by the Arduino ecosystem, and Heltec provides the LoRaWAN protocol source code running on ESP32, plus technical support.
Q: What is the real-world range?
In open terrain, the LoRa link sustains up to about 3 kilometers at low data rates. In dense urban environments, expect shorter ranges; the IPEX antenna connector lets you attach a higher-gain antenna.
Q: Can it run on battery?
Yes. The onboard SH1.25-2 battery interface includes lithium battery management, and the board operates from 3.3V to 7V, making low-power field deployments straightforward.
Q: Does it include Wi-Fi and Bluetooth?
Yes, Wi-Fi 802.11 b/g/n, classic Bluetooth, and BLE low-power dual mode are all onboard, alongside LoRa.
Q: Is the pin header soldered?
No, the pin headers ship unsoldered by default, so you can solder them to fit your enclosure or wiring plan.
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