To add 868 MHz wireless to an Arduino, connect a compatible radio transceiver—such as an RFM95W/SX1276 LoRa breakout—to the board and pair it with a radio using the same modulation and settings. Choose an 868 MHz antenna that fits the breakout, then verify that the radio’s configured frequency, power and airtime are permitted where you will use it. “868 MHz” alone does not guarantee compatibility or legal operation.
Choose a radio architecture that matches your project
An Arduino generally uses a separate transceiver module or a board with an integrated radio. The right choice depends on what the other endpoint uses and whether you want a direct radio link or a LoRaWAN network.
RFM95W/SX1276 LoRa breakout
An 868/915 MHz RFM95W/SX1276 breakout is one option for Arduino projects. Adafruit documents its SPI interface and Arduino library support, and specifies selectable radio output up to +20 dBm. That is a module output specification—not a recommendation or assurance that a complete transmitter and antenna configuration is lawful. See the RFM95W/SX1276 product information and Arduino-oriented wiring and library guide.
RFM69 packet radio
RFM69-family packet radios are another option, but an RFM69 and an RFM95 LoRa radio are not interchangeable over the air simply because both can operate near 868 MHz. They use different modulation. Each endpoint must support compatible radio technology and be configured for a matching channel and radio settings. If you are adding a node to an existing installation, identify the existing radio family and configuration before buying a module.
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Direct link or LoRaWAN
A pair of compatible radios can be used for direct point-to-point or multipoint packet communication. LoRaWAN is a network architecture; a LoRa-capable chip by itself does not make a complete LoRaWAN device or provide network access. Choose a gateway or network provider only when your project needs LoRaWAN connectivity.
Check wiring, power, and antenna before assembly
The RFM95W guide uses hardware SPI, but its wiring instructions cover the guide’s own boards, not every Arduino model. Confirm the exact board’s pinout, voltage compatibility and library example rather than assuming a universal pin mapping.
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- SPI: Verify that the Arduino has usable hardware SPI and identify its correct pins.
- Control lines: Check the breakout’s chip-select, reset and interrupt connections against the board and library example.
- Electrical compatibility: Confirm the radio breakout’s supply and logic-voltage requirements are compatible with the Arduino. Do not infer these from the radio frequency.
- Antenna: Use an antenna intended for 868 MHz and check that its connector matches the exact breakout revision. Place it appropriately for the installation; the connector type is product-specific.
Plan for the link you actually need
Radio performance depends on the payload and update interval, required latency, battery budget, obstructions, antenna and configuration. A vendor’s range statement is not a project measurement: Adafruit describes an approximate 2 km line-of-sight range and qualifies it as dependent on obstructions, frequency, antenna and output power. Treat that as a conditional product claim, not a guarantee for a particular Arduino installation. Test the intended link at its actual locations and operating settings before relying on it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the exact frequency and rules for your location
For EU use, 868 MHz is not one blanket allocation with a single set of conditions. The European Commission’s 2025 consolidated short-range-device table lists separate conditions for different sub-bands and device categories:
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| EU sub-band and category in the table | Listed condition |
|---|---|
| 868–868.6 MHz, non-specific short-range devices | 25 mW e.r.p., subject to spectrum-access/mitigation requirements or a 1% duty-cycle alternative. |
| 868.7–869.2 MHz | 25 mW e.r.p., with a listed 0.1% duty-cycle alternative. |
These are entries for the stated EU sub-bands and category, not permission for every device, application or country. Confirm the applicable national rules and requirements for the intended use, including the precise sub-band, radiated power, bandwidth, access or mitigation method and duty cycle. A module’s selectable output is not the same as the finished system’s radiated output.
The EU Radio Equipment Directive is the framework for placing radio equipment on the EU market. A frequency-table entry alone does not demonstrate that a finished device conforms; builders placing equipment on the market need to assess the applicable requirements. See the Radio Equipment Directive (2014/53/EU). Outside the EU, consult the rules applicable in the country where the transmitter will operate.
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