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Adafruit RFM95W LoRa Radio Transceiver Breakout 無線電收發器分線器 - 868 or 915 MHz - RadioFruit (ada3072)
影片參考:https://youtu.be/RUyTLhZyDr8
Description 描述
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."
“你看，電報是一種非常非常長的貓。你在紐約拉他的尾巴，他的頭在洛杉磯喵喵叫。你明白嗎？無線電的運作方式完全相同：你在這裡發送信號，他們在那裡接收信號。唯一的區別是沒有貓。
Sending data over long distances is like magic, and now you can be a magician with this range of powerful and 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? Most WiFi, Bluetooth, Zigbee and other wireless chipsets use 2.4GHz, which is great for high speed transfers. If you aren't so concerned about streaming a video, you can use a lower license-free frequency such as 433 or 900 MHz. You can't send data as fast but you can send data a lot farther.'
長距離發送數據就像魔術一樣，現在您可以使用這一系列功能強大且易於使用的無線電模組成為魔術師。當然，有時您想與計算機交談（使用WiFi的好時機）或與手機通信（選擇低功耗藍牙！），但是如果您想將數據發送到很遠的地方怎麼辦？大多數WiFi，藍牙，Zigbee和其他無線晶片組使用2.4GHz，非常適合高速傳輸。如果您不太擔心流式傳輸視頻，則可以使用較低的免許可頻率，例如433或900 MHz。你不能以最快的速度發送數據，但你可以把數據發送得更遠。
Also, these packet radios are simpler than WiFi or BLE, you dont have to associate, pair, scan, or worry about connections. All you do is send data whenever you like, and any other modules tuned to that same frequency (and, with the same encryption key) will receive. The receiver can then send a reply back. The modules do packetization, error correction and can also auto-retransmit so its not like you have worry about everything but less power is wasted on maintaining a link or pairing.
此外，這些分組無線電比WiFi或BLE更簡單，您不必關聯，配對，掃描或擔心連接。您所要做的就是隨時發送數據，任何其他調諧到相同頻率（並且使用相同的加密密鑰）的模組都將收到。然後，接收方可以發回回復。這些模組可以進行打包，糾錯，也可以自動重新傳輸，因此您不必擔心一切，但更少的功率浪費在維護鏈路或配對上。
These modules are great for use with Arduinos or other microcontrollers, say if you want a sensor node nework or transmit data over a campus or town. The trade off is you need two or more radios, with matching frequencies. WiFi and BT, on the other hand, are commonly included in computers and phones.
這些模組非常適合與Arduinos或其他微控制器一起使用，例如，如果您想要感測器節點或通過校園或城鎮傳輸數據。權衡是您需要兩個或多個具有匹配頻率的無線電。另一方面，WiFi和BT通常包含在計算機和手機中。
These radio modules come in four variants (two modulation types and two frequencies) The RFM69's are easiest to work with, and are well known and understood. The LoRa radios are exciting and more powerful but also more expensive.
這些無線電模組有四種變體（兩種調製類型和兩種頻率），RFM69最容易使用，並且眾所周知和理解。LoRa收音機令人興奮，功能更強大，但也更昂貴。
This is the 900 MHz radio version, which can be used for either 868MHz or 915MHz transmission/reception - the exact radio frequency is determined when you load the software since it can be tuned around dynamically. We also carry a 433 MHz version here. These are +20dBm LoRa packet radios that have a special radio modulation that is not compatible with the RFM69s but can go much much farther. They can easily go 2 Km line of sight using simple wire antennas, or up to 20Km with directional antennas and settings tweakings
這是900 MHz無線電版本，可用於868MHz或915MHz傳輸/接收 - 確切的無線電頻率是在載入軟體時確定的，因為它可以動態調諧。我們在這裡還提供433 MHz版本。這些是+20dBm LoRa分組無線電，具有特殊的無線電調製，與RFM69不相容，但可以走得更遠。他們可以使用簡單的線天線輕鬆到達2公里的視線，或者使用定向天線和設置調整輕鬆達到20公里的視線
- Packet radio with ready-to-go Arduino libraries
帶有即用型Arduino庫的分組無線電
- Uses the license-free ISM band: "European ISM" @ 868MHz or "American ISM" @ 915MHz
使用免許可的 ISM 頻段：「歐洲 ISM」 @ 868MHz 或 “美國 ISM” @ 915MHz
- Use a simple wire antenna or spot for uFL or SMA radio connector
使用簡單的有線天線或點用於uFL或 SMA 無線電連接器
- SX1276 LoRa® based module with SPI interface
SX1276 基於羅拉的模組，®帶 SPI 介面
- +5 to +20 dBm up to 100 mW Power Output Capability (power output selectable in software)
+5 至 +20 dBm 高達 100 mW 的功率輸出能力（功率輸出可在軟體中選擇）
- ~100mA peak during +20dBm transmit, ~30mA during active radio listening.
在+20dBm傳輸期間峰值約為100mA，在有源無線電收聽期間約為30mA。
- Range of approx. 2Km, depending on obstructions, frequency, antenna and power output
範圍約為 2Km，具體取決於障礙物、頻率、天線和功率輸出
All radios are sold individually and can only talk to radios of the same part number. E.g. RFM69 900 MHz can only talk to RFM69 900 MHz, LoRa 433 MHz can only talk to LoRa 433, etc.
所有收音機均單獨銷售，只能與相同部件號的收音機通話。例如，RFM69 900 MHz 只能與 RFM69 900 MHz 通信，LoRa 433 MHz 只能與 LoRa 433 通信等。
Each radio comes with some header, a 3.3V voltage regulator and levelshifter that can handle 3-5V DC power and logic so you can use it with 3V or 5V devices. Some soldering is required to attach the header. You will need to cut and solder on a small piece of wire (any solid or stranded core is fine) in order to create your antenna. Optionally you can pick up a uFL or SMA edge-mount connector and attach an external duck.
每個無線電都帶有一些接頭，一個3.3V穩壓器和電平轉換器，可以處理3-5V DC電源和邏輯，因此您可以將其與3V或5V設備一起使用。連接針座需要一些焊接。您需要在一小塊電線上切割和焊接（任何實心或絞合芯都很好）才能創建天線。（可選）您可以拿起 uFL 或 SMA 邊緣安裝連接器並連接外部鴨子。
This is the 900 MHz radio version, which can be used for either 868MHz or 915MHz transmission/reception
這是900 MHz無線電版本，可用於868MHz或915MHz傳輸/接收
- the exact radio frequency is determined when you load the software since it can be tuned around dynamically
- 確切的無線電頻率是當您載入軟體時確定的，因為它可以動態調整
Technical Details 技術細節
- Dimensions: 29mm x 25mm x 4mm / 1.14" x 1.0" x 0.2"
尺寸：29 毫米 x 25 毫米 x 4 毫米 / 1.14 英寸 x 1.0 英寸 x 0.2 英寸
- Weight 3.1g
重量 3.1g
