# How to test sensors in redmangoH **URL:** \ **Category:** mangOH Red\ **Created:** [October 7, 2020, 4:35am UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366 "2020-10-07T04:35:26Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![chaipattanasaisa-ard](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chaipattanasaisa-ard](https://mangoh.discourse.group/u/chaipattanasaisa-ard)\ **Post date:** [October 7, 2020, 4:35am UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/1 "2020-10-07T04:35:26Z")
When I start app redSensorToCloud, all sensors don’t send the value to the Cloud. So, I would like to verify sensors in Red mango such as pressure, light sensor one by one to make sure that the sensor is still working. Any ideas? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 7, 2020, 6:06am UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/2 "2020-10-07T06:06:27Z")
are you using WP76? You can have a look on this thread: > [@MangOH Red Not Transmitting](https://mangoh.discourse.group/t/mangoh-red-not-transmitting/4074/5): > > How do I check the sensor driver and app log? ---
**Author:** ![chaipattanasaisa-ard](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chaipattanasaisa-ard](https://mangoh.discourse.group/u/chaipattanasaisa-ard)\ **Post date:** [October 7, 2020, 8:04am UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/3 "2020-10-07T08:04:31Z")
It is WP8548. Some sensor can transmit sometimes. Really have no idea ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 7, 2020, 8:30am UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/4 "2020-10-07T08:30:37Z")
have you compared the logread to debug? ---
**Author:** ![chaipattanasaisa-ard](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chaipattanasaisa-ard](https://mangoh.discourse.group/u/chaipattanasaisa-ard)\ **Post date:** [October 8, 2020, 2:10pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/5 "2020-10-08T14:10:06Z")
This is what I got from logread -f > Oct 8 14:08:04 swi-mdm9x15 user.err Legato: =ERR= | redSensor[1080]/position T=main | position.c Sample() 50 | Failed to read sensor (LE\_OUT\_OF\_RANGE). > Oct 8 21:08:04 swi-mdm9x15 user.err kernel: [860.181443] qup\_i2c qup\_i2c.0: QUP: I2C status flags :0x1300c8, irq:187 > Oct 8 21:08:04 swi-mdm9x15 user.err kernel: [860.187089] qup\_i2c qup\_i2c.0: I2C slave addr:0x3a not connected > Oct 8 21:08:04 swi-mdm9x15 user.info kernel: [860.197192] gpio\_check\_and\_wake: wake-n\_gpio77 STATE=WAKEUP > Oct 8 21:08:04 swi-mdm9x15 user.info kernel: [860.215901] gpio\_check\_and\_wake: wake-n\_gpio77 STATE=SLEEP ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 8, 2020, 2:35pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/6 "2020-10-08T14:35:36Z")
You can try to see the value of the following and see if the sensor is working fine. /sys/bus/i2c/devices/0-0068/iio:device0/in\_accel\_x\_raw ---
**Author:** ![chaipattanasaisa-ard](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chaipattanasaisa-ard](https://mangoh.discourse.group/u/chaipattanasaisa-ard)\ **Post date:** [October 8, 2020, 2:44pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/7 "2020-10-08T14:44:49Z")
> -sh: /sys/bus/i2c/devices/0-0068/iio:device0/in\_accel\_x\_raw: Permission denied ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 8, 2020, 3:34pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/8 "2020-10-08T15:34:19Z")
You should use “cat /sys/bus/i2c/devices/0-0068/iio:device0/in\_accel\_x\_raw” ---
**Author:** ![chaipattanasaisa-ard](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chaipattanasaisa-ard](https://mangoh.discourse.group/u/chaipattanasaisa-ard)\ **Post date:** [October 8, 2020, 3:49pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/9 "2020-10-08T15:49:12Z")
it replies in some values. however, do you know the address for light sensor, pressure sensor…? ---
**Author:** ![chaipattanasaisa-ard](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chaipattanasaisa-ard](https://mangoh.discourse.group/u/chaipattanasaisa-ard)\ **Post date:** [October 8, 2020, 3:51pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/10 "2020-10-08T15:51:51Z")
root@swi-mdm9x15:~# ls /sys/bus/i2c/devices/0-0068/iio:device0 > buffer in\_anglvel\_sampling\_frequency in\_temp\_scale > dev in\_anglvel\_sampling\_frequency\_available name > in\_accel\_sampling\_frequency in\_anglvel\_scale power > in\_accel\_sampling\_frequency\_available in\_anglvel\_scale\_available scan\_elements > in\_accel\_scale in\_anglvel\_x\_raw subsystem > in\_accel\_scale\_available in\_anglvel\_y\_raw trigger > in\_accel\_x\_raw in\_anglvel\_z\_raw uevent > in\_accel\_y\_raw in\_temp\_offset > in\_accel\_z\_raw in\_temp\_raw where is the light senser ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 8, 2020, 3:56pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/11 "2020-10-08T15:56:25Z")
This is for pressure sensor /sys/bus/i2c/devices/0-0076/iio:device1/in\_pressure\_input ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 8, 2020, 4:00pm UTC](https://mangoh.discourse.group/t/how-to-test-sensors-in-redmangoh/5366/12 "2020-10-08T16:00:45Z")
Light sensor is using ADC to read >