rtl433_2_aprs

Parser of RF Data from Weather Stations to be sent over APRS, written in Java

Dependencies

• Librtlsdr Rrtl-sdr codebase: https://osmocom.org/projects/rtl-sdr/
• RTL_433 radio transmissions decoder (433Mhz, 868MHz, 915Mhz via rtl_sdr dongles): https://github.com/merbanan/rtl_433
• ASFK audio modulation/encoding over AX.25 protocol: https://github.com/damico/javAX25
• GPSD Client: https://github.com/damico/gpsd.client
• Adafruit_BMP.BMP085: https://github.com/adafruit/Adafruit_Python_BMP
• PYUSB: https://pyusb.github.io/pyusb/

Compiling

git clone https://github.com/damico/rtl433_2_aprs
git clone https://github.com/damico/javAX25
git clone https://github.com/damico/gpsd.client
cd gpsd.client
mvn clean install -DskipTests
cd ../javAX25
mvn clean install -DskipTests
cd ../rtl433_2_aprs
mvn clean install -DskipTests

• If you want to generate a executable jar package use this command: mvn clean install -DskipTests package.

Software

Diagram

Hardware

Diagram

Prototype 1

Prototype 2

Sound Card Troubleshooting

If you cannot be sure if an encoded APRS data has been sent/audible by your sound card, maybe it is muted or not working through command line interface, in these cases you may find useful run these 2 commands:

1. Force unmute the Master volume: $ amixer sset Master unmute or maybe $ amixer sset Headphones unmute
2. Force test audio signals over headphones and speakers: $ speaker-test -t wav -c 6

Supported Weather Stations

• WS1080/WH3080

• WH25

• WS24/HP1000