RAK7205 temperature issue

LPWAN Nodes RAK7205 / RAK5205
1

Hi, I have an updated RAK7205.
BOOT: RUI_RAK5205_BOOT_Version3_0_2
FIRMWARE: RUI_RAK5205_V3.0.0.12.H.T1(EU868-US915-AU915-KR920-IN865)

I purchased this tracker last year, and already with the 2.0.x firmware I noticed a problem with temperature readings, they are highter than 4°C.

No software / hardware changes, I use TTN and I read the data on Cayenne, I followed the documentation step by step.
I have read some other similar problems with the BME680, regarding the heating of the gas resistance.

Has anyone else encountered this problem? Thanks.

2

Is it possible to have some indications from the staff to perform troubleshooting? Thanks.

3

Hi @donetdisturb Really sorry for the late reply. In what condition you use the Node? Charging or battery powered (or both) you see this difference.

4

I have the same problem. However BME680 works with RUI_RAK5205_V3.0.0.12.L.T1(EU433-CN470) firmware.
@velev I’m using USB power. My node doesn’t have a battery. Is that the issue with EU868?

5

Hello @velev, both.
Battery mode: +3 or +4 C°
In-charge mode: +6 or +7 C° (-14% humidity)

6

I also noticed that 7205 reports a +2 or +3 temperature than the air temperature. I think it is because of the plastic enclosure - it is airtight/waterproof. So it will probably report the temperature of the inside air.

7

Not probably, but definitely!

The device will keep the internal temperature warm - there is the possibility that it could keep the internal temperature +20 degrees or more. I’ve had devices with -50℃ external temperature reporting +10℃ in the box.

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