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Nextion wired to a DVMEGA

Posted: Fri Sep 14, 2018 12:35 pm
by 2E0LGZ
I had a spare UHF DVMEGA and have wired a nextion screen directly to the board it powers up but does not display any information callsigns etc i have enabled ‘modem’ Dev’ etc in the configuration menu on pistar and have the correct TX-RX and RX-TX but still no joy i wonder if theres a procedure i have to do first maybe?
Gary 2E0LGZ

Re: Nextion wired to a DVMEGA

Posted: Fri Sep 14, 2018 1:28 pm
by KE0FHS
Are you sure you programmed the Nextion screen correctly? For more info about that, Rob van Rheenen, PDØDIB, has posted some great instructions on the Nextion Ham-Radio Screens  Facebook group: https://www.facebook.com/groups/Nextion/

More info:

Re: Nextion wired to a DVMEGA

Posted: Fri Sep 14, 2018 2:00 pm
by 2E0LGZ
Hi Toshen,unfortunately im not on facebook for personal reasons but i have a nextion file on the screen that i was using on another hotspot and thought i would use the same screen to try out with the dvmega but no information i.e callsign/dmr id,time.WLan information or callsigns etc can be displayed but it works with a usb TTL connected to the pi,i was led to believe that the pins on the dvmega would pass the information to the screen.....there must be a procedure somewere that i havent done ?

Re: Nextion wired to a DVMEGA

Posted: Fri Sep 14, 2018 2:37 pm
by KE0FHS
I avoid FB as much as I possibly can, but share links to it because I know a lot of people use it. I wish there was a file section to this forum.

Rob has documentation on GitHub that may help: https://github.com/PD0DIB/Nextion_HAM-radio-screens

From a quick look online, it seems you may need to use a USB to TTL UART Serial Converter, but maybe someone more knowledgeable knows an alternative method.

Re: Nextion wired to a DVMEGA

Posted: Fri Sep 14, 2018 4:14 pm
by 2E0LGZ
Ok Toshen thanks for all the info i shall press on and see what happens if nothing then back to using the TTL it would have been nice to box it all away and not have a usb wire and TTL trailing along side and just having the nextion soldered to the DVMEGA hat
best wishes
Gary 2E0LGZ

Re: Nextion wired to a DVMEGA

Posted: Mon Oct 15, 2018 11:16 pm
by W1RHS
I don't think you can use a Nextion screen directly wired to the DVMega. You can directly wire an OLED screen because it uses different pins. The DVMEGA and the Nextion use the serial port on the GPIO for direct wire. There's only one serial port so you can't use DVMEGA and Nextion at the same time on those pins. You can connect the Nextion to the USB port but you need a USB to TTL level converter.

Re: Nextion wired to a DVMEGA

Posted: Fri Oct 19, 2018 4:11 pm
by 2E0LGZ
Ok Thanks to everyone for your input
Gary