Finally, (almost) all items are arrived.
One easy question for assembly: VIM4’s heatsink is fixed by 4 screws:
They seem to prevent me to add the “M2X” board:
Can (/shall) I remove/peel off those orange “pads” from the M2X board (they would be grounded together on these spots):
Thank you!
Hello! Please reply to my earlier question, thank you!
Moreover: it seems I’ll be utilize a professional audio amp in the car which needs SPDIF signal feed.
I know SPDIF is available on the GPIO header. But how can I “convert” it to proper SPDIF out?
Like this one:
Thanks!
I think you need to make a conversion line yourself. One side can be connected to the socket, while the other side can be plugged into GPIO.
Soon I’m having some trouble with setup procedure.
VIM4 doesn’t seem getting online. DNS is not working for it.
# Internet
DNS:
STATE: NO_CONNECTION
I connected it via wire.
In my router I can see both outgoing and incoming (reply) packets to an NTP server and also to other servers and services.
What shall I check/do?
Moreover! In rescue shell, I can ping ANYTHING! DNS works as intended. Owoow is buggy!
@william.lin : can you please confirm we have an Android14 version now which is compatible with this modem?
Thank you!
@danergo ，
Please try vim4-android-14-v250704 version.
Thank you!
@william.lin: by any chance do you know how this module (RM520N-GL) should be wired to the antennas?
It has 4 antenna pins.
I can buy something like this:
But none of this seems a “GPS antenna”, at least what I’m used to:
So do you have any insights on how can I use this module for proper GPS positioning by adding a sophisticated antenna to it? (Possibly with a bit longer cable in order to place the antenna correctly).
@william.lin: I just came across to a bit more serious problem:
In play store I searched for “Waze”. It’s a popular navigation app.
But play store shows me:
Looking for Waze Navigation & Live Traffic?
This app won’t work for your device
Is this something we (or you) can fix?
Solved by installing from apkpure. 
I’m seeing a VIN input of 9-20V on the user’s manual:
Can you please share:
1.) Pinout (4pins)
2.) Matching connector type
Thank you!
Hi @william.lin: can you please reply to my previous question?
Thank you!
You can’t use an active GPS antenna. The RM520 needs 4 passive antennas each of which does multiple things - including GPS reception.
What’s more the GPS in the RM520 is targeted at stationary or slow moving devices with a 1sec refresh rate and hilariously bad accuracy when in a car moving at > 100kph. We’ve seen race cars with GPS positions on the other side of a river from the actual track!
Thanks for the insights!
What do you suggest for this board to receive precise positioning for a car?
We are looking at a separate GPS board, either serial or USB.
For a delivery vehicle the RM520 GPS is ok, but above 100kph its estimations are wrong.
I’m planning to use Android on this board.
I need positioning to be used in generic Android navigation apps (Google Maps, Waze).
Which modules are supported by your Android OS?
Thank you!
@william.lin , @steely-glint : would you mind sharing your ideas here?
As @william.lin told earlier:
I didn’t expect this to happen (what is said by @steely-glint):
So my CarBox idea so badly needs a good solution for this:
I found some GNSS receivers (USB, and Bluetooth versions). But my intention to support the navigation (GoogleMaps, Waze, etc), even in bad weather conditions and tunnels, etc, so I’d chose something already has these features: based on GNSS, and acceleration in 3D, and I might be able to feed the steering wheel’s rotation, and/or car’s current real speed.
Do you have any ideas for this, or I have to completely rewrite Android to support this use-case?
