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Old 11-12-2016, 11:02 AM   #1
ladidaaa
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Linux command to read Temperature Sensor(s)

Hi,
I would like to turn a kobo touch into a weather station.
I would love to display the actual room temperature.

Is there a linux command to read the actual cpu or battery temperature of the kobo touch?
thanks a lot in advance!
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Old 11-16-2016, 07:04 PM   #2
frostschutz
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Not sure about the Kobo Touch.

The Kobo H2O has a MAX17135 sensor. Or at least, that's the only sensor driver enabled in the kernel.

Quote:
https://www.maximintegrated.com/en/p.../MAX17135.html
The IC includes a temperature sensor that provides the ability to read the internal IC temperature and an external panel temperature with the use of an external temperature-sensing diode. Temperature output data is supplied through I²C.
Sounds good, but I don't know if you can actually query a temperature using that.

There actually is a /sys/devices/platform/mxc_epdc_fb/graphics/fb0/temperature and it says 23 for me which happened to be the room temperature... but I just put it out in the cold and it still says 23 so... maybe something else after all.

lm-sensors doesn't find anything.

PS: it did go down to 22 while writing this post.
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Old 11-17-2016, 02:04 PM   #3
ladidaaa
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Thank you for your reply!
is it possible to search for *temp* in /sys/devices ?
I hopefully get the kobo touch at the weekend, then I see for myself
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Old 11-17-2016, 02:31 PM   #4
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find /proc /sys -iname "*temp*" is what I did (same for therm) and that's what I found on the H2O...

As a weather station you have to get weather info from somewhere too, so maybe you could acquire temperature from one of your other devices this way too.

Good luck.
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Old 11-22-2016, 01:48 AM   #5
ladidaaa
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Hi,
thanks again for your input!

I rooted my kobo touch and with this command i can read the temperature sensor:
cat /sys/devices/platform/tps6518x_sensor.0/temp_input

This command gives me "21".
I assume this is the correct temperature reading.
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Old 11-22-2016, 06:10 AM   #6
CatRovacer
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Scusami, but i found for Glo

This path only for Touch?
I looked Glo hardware, also used TPS65185.
But i not find like /sys/devices/platform/tps6518x in Glo.

I am looking for a way to read and write value VCOM.
Also for Touch
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