Help with Lora Serial constantly restarting

Wireless & IoT LoRa (Long Range)
1

Hi Y’all,
I have a LoRa serial device (WRL-20029) with the following setup:

  • P2P with “server” connected to a laptop with a serial terminal
  • Airspeed 9600
  • Remote device a few feet away for testing.
  • Remote device powered with a 5V 3A capable supply on the JST connector. (I used oscilloscope to verify voltage never drops below 4.8)
  • Remote device receives serial data @ 19200bps from a MAX3232 that is translating a RS232 over to the LoRa device

This is what happens on power up:

  1. Bootup lights flash, Green lights solid indicating the two devices are connected
  2. a few blue lights flash on both sides indicating data transmission.
  3. Data is seen coming in on the laptop. No issues with data quality at this point
  4. After 10-30 seconds the remote device restarts. (Green lights go out, bootup lights flash, green lights come back up and reconnect)
  5. At this point I might get some more data but sometimes it just gets stuck in a boot loop until I disconnect power.

I have already updated the firmware.

Any ideas? Thank you!

2

Share photos of the problematic unit’s wiring/soldering, specifically near the power pins

3

I don’t have a good picture, but after checking voltages again I concluded that powering the MAX3232 and the LoRa device from the same supply was causing some kind of issue with grounding.

It was probably my fault, but since I have two isolated power supplies anyway, I just decided to power the two devices separately. Which seems to have fixed it.

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