# Measure Oil Level (or any liquid) and alert - hardware + firmware/code

**URL:** <https://community.particle.io/t/measure-oil-level-or-any-liquid-and-alert-hardware-firmware-code/38393>\
**Category:** General\
**Created:** [December 28, 2017, 2:21am UTC](https://community.particle.io/t/measure-oil-level-or-any-liquid-and-alert-hardware-firmware-code/38393 "2017-12-28T02:21:47Z")\
**Posts on this page:** 1\
**Showing post:** 30

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**Author:** ![RWB](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rwb/32/22599_2.png) [@RWB](https://community.particle.io/u/RWB)\
**Post date:** [January 3, 2018, 11:08pm UTC](https://community.particle.io/t/measure-oil-level-or-any-liquid-and-alert-hardware-firmware-code/38393/30 "2018-01-03T23:08:41Z")

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> [@ventz](#):
>
> US-100

> **[Comparison of ultrasonic sensors US-100 and HC-SR04](https://arduibots.wordpress.com/2013/10/14/comparison-of-ultrasonic-sensors-us-100-and-hc-sr04/)**
>
> Let’s compare two ultrasonic sensors fairly widespread in Arduino based projects. For this purpose we will use the US-100 and HC-SR04 sensors, both with similar characteristics, on a breadboa…

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