The are two ways,
1. Use modem in the hotSPOT board,
4PIN show "LCD", pi-star Config MMDVM Display Type select Nextion -> ModemHS RXD to Nextion TX
HS TXD to Nextion RX
HS 5V to Nextion 5V
HS GND to Nextion GND
for Ver1.0.1( !! VCC,GND not same as Ver1.0)
Pi-Star Setting display type
2. Use USB to TTL adapter,
then in pi-star Config MMDVM Display Type select Nextion -> /dev/ttyUSB0
Note: Some USB2TTL adapt not work, had tested CP2102 / CH340 is OK, USB-STC-ISP do not work.
TTL RXD to Nextion TX
TTL TXD to Nextion RX
TTL 5V to Nextion 5V
TTL GND to Nextion GND
TTL RXD to Nextion TX
TTL TXD to Nextion RX
TTL 5V to Nextion 5V
TTL GND to Nextion GND
For RPi hotSPOT with fan
1 Use board 4 PINs Display interface, follow the order.
Warning! Can Not Reversal 5V and GND!
2 Use USBtoTTL Adapter
For Repeater kit board
Just can use USBtoTTL Adapter, STM32F105 without serial interface
Nextion firmware download
From bi7jta ,add show IP address
https://github.com/nano-mmdvm/Duplex_hotSPOT/tree/master/nextion
From G4KLX
https://github.com/g4klx/MMDVMHost/tree/master/Nextion_G4KLX
From facebook group
https://www.facebook.com/groups/Nextion/
About TJC clone LCD ,you can also find in facebook group
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