SparkFun LoRaSerial Kit - 915MHz (Enclosed) Reviews

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Author: Steve Talent

1.0

(1 review)

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Product details

The SparkFun LoRaSerial Kit is a pair of serial radio modems that simply passes serial back and forth between one another. The LoRaSerial provides you with the means to report data every few seconds even if it's located beyond WiFi or Bluetooth® range. With this kit, you'll be able to transmit data over LoRa giving it incredible range compared to other methods. We’ve even been able to regularly transmit over a 9mi (15km) line-of-sight using two LoRaSerial radios using a larger 5.8dBi antenna on the transmitter and the stock 1/2 wave dipole antenna on the receiver. LoRaSerial utilizes a 1 Watt, 915MHz transceiver and an open-source protocol to transmit AES-encrypted data at 4800bps or approximately 480 bytes per second. Although this won't get you video streaming quality, the LoRaSerial is very good at getting whatever data you need, encrypted or not, from point A to point B without fuss. The radios in this kit automatically frequency hop (FHSS) between channels to avoid collisions. The ‘airspeed’ or data rate is configurable up to approximately 2,000 bytes per second for shorter range, or for extremely long range transmissions, as low as 40 bytes per second. The radios in the LoRaSerial Kit support simple point-to-point communication as well as multipoint broadcasts. Multipoint broadcasting makes this kit ideal for GNSS RTK and many other geospatial scenarios where one device needs to produce and delineate data that many other devices might need to utilize. The LoRaSerial firmware supports an innovative and simple-to-use ‘training’ method. Pressing the train button on both radios will generate a new random network ID and AES encryption key to share them. This makes pairing radios in the field as simple as a press of a button. By bringing the radios near each other the LoRaSerial training method is as simple and secure as you could ask for. Currently, SparkFun is offering radios in the LoRaSerial Kit that utilize 915MHz modems that are allowed in most parts of the world. Please check your local restrictions before purchasing. The radios are fully configurable to restrict frequencies, channels, dwell time, power output, and a variety of other settings to make the radios compatible with your local regulations. Note: LoRaSerial is designed to operate at the physical layer of LoRa sending data directly to an endpoint as opposed to something like LoRaWAN which operates on the data and network layers. For this reason, LoRaSerial is not intended to operate on LoRaWAN.

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Apr 9, 2026

I am using this with a GNSS-RTK base station which uses the SparkFun GNSS Flex pHAT ZED-X20P to send RTCM messages a rover, also based on the pHAT ZED-X20P. I have had limited success. One problem is that I'm not getting the throughput I expected. I have configured the LoRa AirSpeed to 19200 baud to handle expected peak rates of 1100 bytes/sec. This works for a short time, then deterioriates. I decided to monitor current draw and it has exceeded 8A a few times and the LoRa disconnects. Here's some output from my test script: ~/RTCM $ python pipe_rtcmcheck.py 2026-04-08 22:04:25,227 INFO GNSS port : /dev/ttyAMA3 @ 460800 baud 2026-04-08 22:04:25,227 INFO LoRa port : /dev/ttyACM0 @ 115200 baud 2026-04-08 22:04:25,227 INFO Forwarding: yes 2026-04-08 22:04:25,233 INFO Running. Ctrl+C to stop. 2026-04-08 22:04:36,008 INFO --- RTCM report --- 2026-04-08 22:04:36,008 INFO Throughput : 997 bytes/sec (7979 bps) 2026-04-08 22:04:36,008 INFO CRC errors : 0 2026-04-08 22:04:36,008 INFO Non-RTCM : 0 bytes skipped 2026-04-08 22:04:36,008 INFO Message counts: 2026-04-08 22:04:36,008 INFO 1006 Base position + height 10 2026-04-08 22:04:36,008 INFO 1077 GPS MSM7 10 2026-04-08 22:04:36,008 INFO 1097 Galileo MSM7 10 2026-04-08 22:04:36,008 INFO 1127 BeiDou MSM7 10 2026-04-08 22:04:36,008 INFO ------------------- 2026-04-08 22:04:55,656 INFO --- RTCM report --- 2026-04-08 22:04:55,656 INFO Throughput : 443 bytes/sec (3544 bps) 2026-04-08 22:04:55,656 INFO CRC errors : 0 2026-04-08 22:04:55,656 INFO Non-RTCM : 0 bytes skipped 2026-04-08 22:04:55,656 INFO Message counts: 2026-04-08 22:04:55,656 INFO 1006 Base position + height 8 2026-04-08 22:04:55,656 INFO 1077 GPS MSM7 9 2026-04-08 22:04:55,656 INFO 1097 Galileo MSM7 9 2026-04-08 22:04:55,656 INFO 1127 BeiDou MSM7 8 2026-04-08 22:04:55,656 INFO ------------------- ... a short time later... 2026-04-08 22:05:46,005 INFO --- RTCM report --- 2026-04-08 22:05:46,005 INFO Throughput : 1025 bytes/sec (8203 bps) 2026-04-08 22:05:46,005 INFO CRC errors : 0 2026-04-08 22:05:46,005 INFO Non-RTCM : 0 bytes skipped 2026-04-08 22:05:46,005 INFO Message counts: 2026-04-08 22:05:46,005 INFO 1006 Base position + height 11 2026-04-08 22:05:46,005 INFO 1077 GPS MSM7 10 2026-04-08 22:05:46,005 INFO 1097 Galileo MSM7 10 2026-04-08 22:05:46,005 INFO 1127 BeiDou MSM7 11 2026-04-08 22:05:46,005 INFO ------------------- 2026-04-08 22:06:03,946 INFO --- RTCM report --- 2026-04-08 22:06:03,946 INFO Throughput : 400 bytes/sec (3196 bps) 2026-04-08 22:06:03,946 INFO CRC errors : 0 2026-04-08 22:06:03,946 INFO Non-RTCM : 0 bytes skipped 2026-04-08 22:06:03,946 INFO Message counts: 2026-04-08 22:06:03,946 INFO 1006 Base position + height 6 2026-04-08 22:06:03,946 INFO 1077 GPS MSM7 7 2026-04-08 22:06:03,946 INFO 1097 Galileo MSM7 7 2026-04-08 22:06:03,946 INFO 1127 BeiDou MSM7 6 2026-04-08 22:06:03,946 INFO ------------------- 2026-04-08 22:06:05,242 ERROR Serial error: write failed: [Errno 19] No such device