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BrianTee 05-29-2019 11:06 AM

Ardusimple RTK
One big question and that is in terms of output. While serial is a given, should the module have ethernet (wired) output as well as bluetooth? Wifi really has its issues in terms of real time, and I strongly feel it would be disastrous to output via wifi - also saves a lot of money in design and production.

So if you could have bluetooth, wired ethernet udp output, and serial output, would that suffice? Also enclosed in an IP67 box that sits on the outside on the cab or inside that outputs an nmea sentence with position, heading, roll and speed and the basics that AgOpenGPS can parse in a single sentence? Also of course be full RTK.

Would you use udp output? or just serial?

wvca 05-29-2019 12:44 PM

don't know about everyone else, but simple serial is good enough for me ...:)

Jays_Truck 05-29-2019 12:57 PM

I believe a serial and wired ethernet should be a minimum. Bluetooth can be added inexpensively. I am on the fence on whether to house the simplertk2b boards and the "Arduino" boards in there own IP67 enclosure on the roof and run power + ethernet to them or house the simplertk2b boards in the cab next to the other PCBs and just have 3 SMA connections going to the roof (2X GPS receivers + one LORA radio/GSM antenna). I think the latter option would be cleaner from a wiring perspective.

I want to go down the UDP route but i am still using serial for now.

Side note but very applicable,
Based on dopperlgrau's comment in the PCB thread the simplertk2b board will output heading and position but only in UBX format so we will need an Arduino or ESP32 to convert the UBX messages to NMEA then we need to send that message serially or broadcast it via UDP.


Originally Posted by doppelgrau (Post 3336263)
Got some information from ardusimple:

  • If you use an LR kit with corrections coming over XBee, you only need to connect to 1 UART. This UART will give RTK position + heading, but only in UBX protocol
  • If you use NTRIP server, you will need 2 connections, one to send corrections to simpleRTK2Blite, and another one to read RTK position+heading in UBX protocol.

So I have to do a (small) redesign to free up two pins on the esp32 for an other UART that can be connected to the "XBee-Module". Means a second (or one larger) port expander is needed. (An ESP32 has so many IOs, and still not enough ...)

Beerwiser 05-29-2019 12:58 PM

I am with Warren.

doppelgrau 05-29-2019 01:05 PM

As an "ESP32 guy" I'd say: you get wifi and bluetooth so cheap, it'll be a bad idea to forgo this option.

Some prices (without VAT, only the parts) to back my claim:
  • ESP32-WROOM-32 module about 3,3 EUR, includes micro controller, wifi, bluetooth. Need only a few additional parts (resistors, capacitors) so total maybe 4 EUR
  • Ethernet about 4,6 EUR
    • The RJ45 connector with integrated magnetics: 3,1 EUR
    • Transceiver (LAN8720) 0,9 EUR
    • some more resistors/capacitors,ferites (one for higher Voltage)
  • RS232: UART <-> RS232 converter and D-Sub connector each about 1 EUR => 2 EUR
In addition you'll need a bit for power supply, USB (if you want to be able to program it without additional hardware), so I'd say saving 1 or maybe even 2 EUR on the micro controller isn't worth missing the wifi-feature.

joesixpack 05-29-2019 01:30 PM

Is CAN out of the question? Just notice some of the newer stuff is handling the positions over CAN now.

You just need to send the tractor company’s a polite message to share their can messages before you completely decimate their guidance business with your open source solution!

That might be when the men in black show up though...:22:

dairytech 05-29-2019 01:47 PM

Wired Ethernet and serial minimum. I am not interested in wireless solutions; they are too finicky for me. I don't care if it is there; I just won't use it.

Is there any reason we couldn't add support for UBX protocol?

doppelgrau 05-29-2019 01:47 PM

CAN is 1 EUR more :1:

Beerwiser 05-29-2019 02:24 PM

Tractor that has CAN bus is a bit more:22:

kaanakgser 05-29-2019 03:46 PM

These are useless for us? They look beautiful. And at the bottom of the thingiverse page (coming soon)

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