bg4rff / aprs-1

Mini-APRS Transmitter

aprs

Mini-APRS Transmitter

(Note alot of these notes are now VERY wrong -- I'll update these later)

This project is combining a bunch of pieces together to greate a small 1w APRS transmitter. This can be connected to an external RF AMP for extended coverage.

Bits and Pieces:

• GYNEO6MV2 GPS Module ~ $5 USD
• DRA818V 2M Transiver ~ $15 USD
• ESP12E 8266 Devkit v2 ~ $5 USD
• Atmega 128 with Arduino Bootloader ~ $2 USD
• Total Cost (Not including extra bits and board): ~ $30 USD

sendafsk

Arduino Sketch that takes a serial APRS message and transmits it - Also, will take DRA818V commands and pass them on.

This is strongly based on the Trackuino code (actually, most of it is from that project) - See https://github.com/trackuino/trackuino

sketch

(Needs to be renamed)

8266 Sketch that Interfaces the GPS and sendafsk with a handy Wifi front-end.

Using ESP12E Devkit as Arduino

http://www.instructables.com/id/The-First-Usage-of-NodeMCU-ESP12E-DEVKIT-V2/

This project is using the same basis as http://www.f4huy.fr/?p=906 however, will probably be different and our own brand of weird.

ESP12E Pinouts:

• D0 - GPS Fix LED
• D2 - GPS TX
• D3 - GPS RX

AX25/AFSK Libraries

Eventually it would be nice to make the 8266 do the ASFK - but, there is pin limitations - so maybe the current way is best.

Current issue is getting AFSK working on the ESP8266 (ESP12E). This is a list of Libraries implementing this, however none work with the ESP.

• https://github.com/kronenpj/AX25 - AVR specific code ( Forked from: https://github.com/slepp/ax25 )
• https://github.com/trackuino/trackuino - AVR and PIC32 specific code

Ones that use a specific modem board:

• https://github.com/kicksat/ax25 ( HopeRF Board)
• https://github.com/markqvist/MicroModem ( Micromodem )

APRS Nodes:

• q Codes in a path: http://www.aprs-is.net/q.aspx
• DIGI Paths: http://wa8lmf.net/DigiPaths/

Notes for Rev2

• https://deeplyembedded.wordpress.com/2016/11/21/esp8266_spi/

building

To build platformio run -e [enviroment:brains/sendafsk]

To push platformio run -e [enviroment:brains/sendafsk] -t upload

Upload config: platformio run -e brains -t uploadfs