Adafruit RFM95W LoRa Radio Transceiver Breakout - 868 or 915 MHz - RadioFruit [PID:3072] - (AD80522)

Description:

"You see, the cable telegraph is a kind of very, very long cat. You pull its tail in New York and its head meows in Los Angeles. Do you understand this? And radio works in exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."

Sending data over long distances is like magic, and now you can be a wizard with this range of powerful, easy-to-use radio modules. Sure, sometimes you want to talk to a computer (a good time to use WiFi) or perhaps communicate with a phone (choose Bluetooth Low Energy!), but what if you want to send data very far away? Most WiFi, Bluetooth, Zigbee, and other wireless chipsets use 2.4GHz, which is great for high-speed transfers. If you're not so concerned with video streaming, you can use an unlicensed lower frequency, like 433 or 900 MHz. You can't send data as fast, but you can send data much further."

Additionally, these packet radios are simpler than WiFi or BLE; you don't have to associate, pair, scan, or worry about connections. All you have to do is send data when you want, and any other module tuned to the same frequency (and with the same encryption key) will receive it. The receiver can then send a reply. The modules packetize, error correct, and can also retransmit automatically, so it's not like you have to worry about everything, but less power is wasted on maintaining a link or pairing.

These modules are great for use with Arduinos or other microcontrollers, for example, if you want a sensor node network or to transmit data across a campus or city. The downside is that you need two or more radios with matching frequencies. WiFi and BT, on the other hand, are commonly included in computers and phones.

These radio modules come in four variants (two modulation types and two frequencies). RFM69s are easier to use and are well-known and understood. LoRa radios are interesting and more powerful, but also more expensive.

This is the 900 MHz radio version, which can be used for 868 MHz or 915 MHz transmit/receive; the exact radio frequency is determined when you load the software, as it can be dynamically tuned. We also have a 433 MHz version here. These are +20dBm LoRa packet radios that have special radio modulation that is not compatible with RFM69 but can go much further. They can easily cover a 2km line of sight using simple wire antennas, or up to 20km with directional antennas and configuration adjustments.

- Packet radio with ready-to-use Arduino libraries

- Uses the unlicensed ISM band: "European ISM" @ 868MHz or "American ISM" @ 915MHz

- Use a simple wire antenna or a spot for a uFL or SMA radio connector

- SX1276 LoRa®-based module with SPI interface

- +5 to +20 dBm up to 100 mW Power output capability (power output selectable in software)

- 100mA peak during +20dBm transmission, ~30mA during active radio listening.

- Range of approx. 2Km, depending on obstacles, frequency, antenna, and output power.

All radios are sold individually and can only communicate with radios of the same part number. E.g., RFM69 900 MHz can only communicate with RFM69 900 MHz, LoRa 433 MHz can only communicate with LoRa 433, etc.

Each radio comes with a header, a 3.3V voltage regulator, and a level shifter that can handle 3-5VCC power and logic so you can use it with 3V or 5V devices. Some soldering is required to attach the header. You'll need to cut and solder a small piece of wire (any solid or stranded core is fine) to create your antenna. Optionally, you can choose a uFL or SMA edge mount connector and attach an external duck.

This is the 900 MHz radio version, which can be used for 868 MHz or 915 MHz transmit/receive.

- the exact radio frequency is determined when you load the software, as it can be dynamically tuned

Reference Link 1

Reference Link 2