GL-MiFi [GPIO] - How to read battery status?

spacedream · 2019-06-15T11:38:23.830Z

I bought some 3.3v buzzer on ebay, i wish to add it in to mifi and make it friendly reminder beeps then battery level 10% or less and in same time the external charger not plugged in.
So, how to track this two events?

read battery charge level
check external charger plugged in or not.
Thanks!

alzhao · 2019-06-17T07:52:39.618Z

First your mifi hardware version should be 2.6.2 above.

Then you should be able to read data using

cat /tmp/mcu_data

You will find there are three values in the json data: T, P, C, which means Temperature, Percentage, Charging

spacedream · 2019-06-17T10:41:40.475Z

I think i’m not so lucky I bought mine from amazon just couple month ago, why its so old already?

root@GL-MIFI:~# cat /tmp/mcu_data
cat: can’t open ‘/tmp/mcu_data’: No such file or directory
root@GL-MIFI:~#

How i can check my HW version?
thanks!

Johnex · 2019-06-17T11:55:36.107Z

First off Amazon gets large shipments so they probably have a lot of older stock.
The digital battery readout feature was introduced one month or so ago, maybe 2, so only people that ordered directly from the GL website probably have it.

You can check what mifi hardware you have by opening the case and reading the markings on the board

mms101 · 2019-06-19T17:02:35.690Z

Hello,

Could you please clarify, where is on the board the hardware version? Is it under modem and is like GLZT_MIFI_V2.5.0?

Thanks!

alzhao · 2019-06-20T03:40:45.547Z

This is only available in v2.6.2 and newer.

alzhao · 2019-06-20T03:48:32.508Z

Can you pls make sure if you have this package installed?

gl-mifi-mcu

Johnex · 2019-06-20T06:33:56.114Z

Yeah you have board v2.5, it doesn’t support the new digital battery readout.

kmahyyg · 2021-03-12T01:45:03.447Z

on my GL-XE300, you should manually run /usr/bin/xe300_mcu to get /tmp/mcu_data, why couldn’t you add a dev descriptor into /sys for read it?