Variable Rate for Ag Open, project coded in Flutter, supporting Android and iOS, also windows soon!
This project is under development.
First set the preferences in the settings menu
- Currently only internal gps supported
- Only PGN mode section flow/dist supported
- Set UDP output (input not used yet)
- Set sections structure (define section # and width in cms, also antenna offset [normal is total width/2])
Please to test it load a shpafile (.shp+.shx+.dbf). Then app would ask to select one of the numeric columns in your prescription shapefile, and a default rate when no polygon is found. Important: unit should be units/ha.
PGN Structure (flow/dist mode):
ints = [128, 129, 113, 71, 3, 0, 9, 96, 184]
byte1= 0x80 AOG header1
byte2= 0x81 AOG header2
byte3= Source (VRAGO)
byte4= PGNid
byte5= Length
byte6= Section # (int)
byte7= rateHIGH
byte8= rateLOW
byte9= CRC
The rate bytes define a 2 byte unsigned int that correspond to 10,000X the units to apply in 1 meter of displacement of the section. To convert to double just get the int from the 2 bytes and divide by 10,000.
CRC is an addition of all values and truncated to lower 8 bits, getting a 0-255 value (see calculation in lib/api/UDPManager.dart).
AOG as location provider (Over UDP PGN)(AOG location now supported, but still not reading section from AOG 😔)- Read sections from AOG automatically (Over UDP PGN)
- TCP/UDP Location provider with NMEA parser
- ESP32 Demo code
- Flow/time mode, send PGN using speed from location provider, calculating the target flow/time
- Windows support using AOG or TCP/UDP locations provider
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