# Hc-sr04 problem

**URL:** <https://forum.xod.io/t/hc-sr04-problem/513>\
**Category:** Uncategorized\
**Created:** [February 18, 2018, 6:06pm UTC](https://forum.xod.io/t/hc-sr04-problem/513 "2018-02-18T18:06:05Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![warner](https://avatars.discourse-cdn.com/v4/letter/w/0ea827/32.png) [@warner](https://forum.xod.io/u/warner)\
**Post date:** [February 22, 2018, 1:38am UTC](https://forum.xod.io/t/hc-sr04-problem/513/3 "2018-02-22T01:38:00Z")

</div>

I’m not sure if this would be the same for your project but I had an [issue with the range sensor](https://forum.xod.io/t/robot-motor-power-issues/510/5) not working because the voltage supplied was low. @nkrkv and @gweimer were able to help me fix it by adding an extra battery to my power supply. I was surprised that voltages around 4.2-4.5 would make it not work but that is what happened for me.

---

_[View the full topic](https://forum.xod.io/t/hc-sr04-problem/513)._