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長距離發送數據就像魔術，現在您可以成為一個強大而易於使用的無線電模塊的魔術師。當然，有時你想和一台電腦交談（一個好時機使用WiFi），或者可以和一個電話通話（選擇藍牙低功耗！），但是如果你想發送數據呢？大多數WiFi，藍牙，Zigbee等無線芯片組使用2.4GHz，這對於高速傳輸是非常好的。如果您不那麼關心流媒體視頻，可以使用更低的免許可頻率，例如433或900 MHz。您不能發送數據盡快，但您可以發送數據更遠。
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。您所做的就是隨時發送數據，任何其他調整到相同頻率的模塊（以及相同的加密密鑰）都將收到。然後，接收者可以發回答复。模塊進行分組化，糾錯，還可以自動轉發，因為它不像您擔心的一切，但是在維護鏈接或配對時浪費更少的功耗。
這些模塊非常適合與Arduinos或其他微控制器一起使用，例如，如果您想要傳感器節點紐約或在校園或城鎮傳輸數據。您需要兩個或更多的無線電，具有匹配的頻率。另一方面，WiFi和BT通常包括在電腦和手機中。
這些無線電模塊有四種變體（兩種調製類型和兩種頻率）RFM69是最容易使用的，並且是眾所周知和理解的。LoRa收音機令人興奮，功能更強大，但也更昂貴。
這是900 MHz無線電版本，可用於868MHz或915MHz的發送/接收 -當您加載軟件時，確定的射頻是可以動態調整的。這些是具有與RFM69不兼容的特殊無線電調製的+ 20dBm的LoRa分組無線電，但可以進一步延伸。他們可以使用簡單的有線天線輕鬆地走2公里的視線，或者使用定向天線和設置調整可達20Km
所有收音機都是單獨出售的，只能與同一部件號的無線電台通話。例如RFM69 900 MHz只能與RFM69 900 MHz通訊，LoRa 433 MHz只能與LoRa 433等通話。
每個收音機都配有一些接頭，3.3V電壓調節器和電平調節器，可以處理3-5V直流電源和邏輯，因此可以使用3V或5V器件。需要一些焊接來附接標題。您將需要切割並焊接在一小塊電線上（任何固體或絞合芯都可以使用），以創建您的天線。您也可以選擇一個uFL或SMA邊緣安裝連接器並連接外部鴨子。
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.'
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.
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.
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.
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. 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
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.
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.
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