LuCI plug in to monitor temperature on a Raspberry Pi 4B

Installing and Using OpenWrt
1

the collected-mod-sensors plug in doesn't show any available data to monitor, thanks

2

It's been a long time since I played with collected, but do you have lm-sensors or libsensors installed? Here is little script to query the temp from the shell:

temps.sh 
#!/bin/ash
temp=$(cat /sys/devices/virtual/thermal/thermal_zone0/temp)
freq=$(sleep 0.1s && cat /sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq)
gov=$(cat /sys/devices/system/cpu/cpufreq/policy0/scaling_governor)

echo "CPU temp        :  $(( temp / 1000 ))°C"
echo "CPU freq        :  $(bc <<< "scale=0; $freq/1000") MHz @ $vcore ($gov)"
echo "Processor       :  $(grep -m1 'model name' /proc/cpuinfo | sed 's/^.*: //')"
3

Yes, both of them are installed, I am currently using (as a stop gap) vcgencmd measure_temp to get the current temp, but ideally I need a graph to be able to see trends over time

4

It's been too long for me... is there some config option for the temp sensor within collected you can use? Maybe someone else can help.

5

Thank you, yes, I did the setup in LuCI for the sensors

6

You most likely need collectd-mod-thermal plugin

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7

Thank you, that was it, quick question, why on my router (GL MT-6000) I use collectd-mod-sensors and with the RPi I have to use collectd-mod-thermal? Should I use thermal on the router as well? Both devices use the ARM64 chipset

8

=> I would suggest to try out if it works - if yes, you might get rid of the Sensors plugin and its lm-sensors dependenciy to save some space.

Background info:
Thermal plugin relies on sysfs or procfs info

  • on RPi4 this is available out of the box
  • on GL MT-6000 this might work as well (you could check if cat /sys/devices/virtual/thermal/cooling_device*/temp returns anything)

Sensors plugin relies on lm-sensors info - i.e. provided via I2C bus - and exposes sensor info like voltage, fanspeed and temperature. However, as far as I know, only thermal info is available in luci stats.

note to others: please correct me if I am wrong with the above
9

Thank you, Sensors provides the temperature for CPU and each WIFI cards (2.4 and 5GHz), now, I installed Thermal and provides the same information for the CPU temp as Sensors.

1 Like
10

fyi my avg temp on router (RPi CM4) is 50 °C and on access points (EAP615) is 60 °C (ambient temp 24 °C)