Data transfer from M2 to PC using HC-12 modules

[b.p]

I have an M2 and RS2 on the way but I want to get a head-start on getting it up and running.

The M2 will be mounted on an implement towed ~10>20 m behind a vehicle. I need to get GGA messages to a laptop in the cab to inject into a piece of software. Currently I use a Trimble R8 (@ 5 Hz) using a serial cable which is not ideal due to the chance of cable damage etc.

My plan is to stream data from the M2 using a pair of HC-12 transceivers and then use a serial to USB converter to get the data into the laptop as per the diagram below.

Are there likely to be any issues with this arrangement? I assume the available data rate of the HC12’s will be plenty when only sending GPGGA messages?

Thanks!

[jp-drain-sol]

What type vehicle are you pulling with? If an agricultural tractor, you might try it via Bluetooth. You will be surprised how far BT goes and easily travels through glass

[b.p]

It will be a dual-cab ute. So there will be a bit more in the way than just the glass of a tractor. At this stage I’m planning on packaging the HC-12 and Serial>USB electronics in a small box with a USB cable to the laptop.

Do you mean the internal Bluetooth on the M2 or an external module?

My reasons for initially choosing the HC-12:

• I thought the internal Bluetooth wouldn’t have enough power to reach inside the cab.
• I have used the HC-12 a few years ago for sending drone telemetry.

[julia.shestakova]

Hi @b.p,

I think it should work. I don’t see any obvious reasons why not.

Reach M2 can stream GGA NMEA messages via Serial. To connect the HC-12 transceiver to the Reach, use the JST-GH port (S1 or S2). They both support the UART protocol.

Also, I see the suggestion to use Bluetooth. However, I also see you mentioned that you’re going to work at 10-20 meters distance. Bluetooth is a good option, but it won’t be enough for such a range.