# 30Bar pressure sensor - Arduino

**URL:** <https://discuss.bluerobotics.com/t/30bar-pressure-sensor-arduino/7270>\
**Category:** Sensors\
**Tags:** arduino\
**Created:** [April 27, 2020, 12:47pm UTC](https://discuss.bluerobotics.com/t/30bar-pressure-sensor-arduino/7270 "2020-04-27T12:47:52Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Obert94](https://avatars.discourse-cdn.com/v4/letter/o/ba9def/32.png) [@Obert94](https://discuss.bluerobotics.com/u/Obert94)\
**Post date:** [April 27, 2020, 12:47pm UTC](https://discuss.bluerobotics.com/t/30bar-pressure-sensor-arduino/7270/1 "2020-04-27T12:47:52Z")

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Hi,

I am trying to collect setup the Bar30 Depth/Pressure Sensor with an arduino uno, I already have an LLC (Same as this one: [5Pcs Two Channel IIC I2C L0gic Level Converter Bi-Directional Module Sale - Banggood USA-arrival notice-arrival notice](https://usa.banggood.com/5Pcs-Two-Channel-IIC-I2C-Logic-Level-Converter-Bi-Directional-Module-p-979919.html?rmmds=search&cur_warehouse=CN)), Is it possible to use this as the 5V\<-\>3.3V converter for the Pressure sensor. When I use the example “MS5837\_Example” is gives the following output:  
“”  
Init failed!  
Are SDA/SCL connected correctly?  
Blue Robotics Bar30: White=SDA, Green=SCL  
“”  
So it seems like, that pressure sensor cannot be found.

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**Author:** ![williangalvani](https://avatars.discourse-cdn.com/v4/letter/w/6f9a4e/32.png) [@williangalvani](https://discuss.bluerobotics.com/u/williangalvani)\
**Post date:** [April 27, 2020, 2:15pm UTC](https://discuss.bluerobotics.com/t/30bar-pressure-sensor-arduino/7270/2 "2020-04-27T14:15:51Z")

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Hi @Obert94

This looks like a mislabeled product. The labels imply it is actually Serial and no I2C.  
Since in I2C the communication is bidirectional, I don’t expect this to work.

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**Author:** ![Obert94](https://avatars.discourse-cdn.com/v4/letter/o/ba9def/32.png) [@Obert94](https://discuss.bluerobotics.com/u/Obert94)\
**Post date:** [April 27, 2020, 2:47pm UTC](https://discuss.bluerobotics.com/t/30bar-pressure-sensor-arduino/7270/3 "2020-04-27T14:47:20Z")

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That was my consern too, so I will try with an I2C LLC which says SDA SCL on both side off the converter instead  
Thanks 👍🏼

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**Author:** ![williangalvani](https://avatars.discourse-cdn.com/v4/letter/w/6f9a4e/32.png) [@williangalvani](https://discuss.bluerobotics.com/u/williangalvani)\
**Post date:** [April 28, 2020, 9:00pm UTC](https://discuss.bluerobotics.com/t/30bar-pressure-sensor-arduino/7270/4 "2020-04-28T21:00:02Z")

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