Can someone please tell me what the J4 and P2 connectors are used for?
P2 is used to charge the battery with an external solar panel.
J4 is the antenna welding point of LoRa.
Hi fboesche,P2 is as discribe as Zhuqi ,J4 is a backup connector of GPS antenna.
Thanks for the correction of hairuitao.
Excelent! Many thanks ZhuQI
Thank you, then is confirmed that J4 is for GPS antenna.
hi JeroenKl,
If you want to use solar panel, you need to add a Zener diode on D5 and solder a 5V solar panel to P2.
@hairuitao So we can solder an alternative GPS antenna(connector) here? Does the firmware support an external antenna? Is it used automatically?
Dear @hairuitao,
Can you please provide the zenerdiode specifications? I assume it is 5V1 but I’m not sure.
Also where is D5 located on the board?
BR,
Jeroen
Dear @hairuitao,
Can you please provide the zenerdiode specifications? I assume it is 5V1 but I’m not sure.
Also where is D5 located on the board?
BR,
Jeroen
Hi JeroenKI,
You can find the datasheet as below link :
https://www.alldatasheet.com/view.jsp?Searchword=LBZT52B5V1T1G
I think both 5V1 and 5V6 can be work well. Because the input voltage rage of the charging chip is 4.5V to 6.5V.
And the location of D5 is as follow picture.