# Low voltage detected

**URL:** <https://community.info-beamer.com/t/low-voltage-detected/374>\
**Category:** Help\
**Created:** [February 28, 2019, 12:42pm UTC](https://community.info-beamer.com/t/low-voltage-detected/374 "2019-02-28T12:42:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![lbwa](https://community.info-beamer.com/letter_avatar_proxy/v3/letter/l/4491bb/32.png) [@lbwa](https://community.info-beamer.com/u/lbwa)\
**Post date:** [February 28, 2019, 12:42pm UTC](https://community.info-beamer.com/t/low-voltage-detected/374/1 "2019-02-28T12:42:45Z")

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How are you checking for “Low voltage detected”?

I have a 1.5A 5V power supply connected, but it seems that I keep getting the “Low voltage detected” alert.

My power supply is using a standard Barrel DC power connector and two USB cables are soldered to the connector - one going to the RPi and the other to the HDMI interface/screen.

The whole system draws max 600mA of power - so there is plenty of power left in the supply.

![2019-02-28_13-41-42](https://community.info-beamer.com/uploads/default/original/1X/df733430ee7d1df08c94b4b4705b7d0e877bdba6.jpeg)

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**Author:** ![infobeamer-fw](https://community.info-beamer.com/user_avatar/community.info-beamer.com/infobeamer-fw/32/3_2.png) [@infobeamer-fw](https://community.info-beamer.com/u/infobeamer-fw)\
**Post date:** [February 28, 2019, 12:58pm UTC](https://community.info-beamer.com/t/low-voltage-detected/374/2 "2019-02-28T12:58:03Z")

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The voltage detection uses the built-in mechanisms for that. It basically calls

```plaintext
vcgencmd get_throttled

```

and checks if [bit 16](https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=147781&start=50#p972790) is set in the result. According to the documentation

> under-voltage occurs when voltage drops below 4.63V.

Did you set the [cpu governor](https://info-beamer.com/doc/device-configuration#scalinggovernor) to anything other than powersafe [1]? Generally on a Pi3, a 2.5A power supply is recommended. See [https://www.raspberrypi.org/documentation/faqs/#power](https://www.raspberrypi.org/documentation/faqs/#power)

[1] I just realized the linked documentation is wrong: powersafe is the default. This will be updated soon.

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<div class="post-metadata">

**Author:** ![lbwa](https://community.info-beamer.com/letter_avatar_proxy/v3/letter/l/4491bb/32.png) [@lbwa](https://community.info-beamer.com/u/lbwa)\
**Post date:** [February 28, 2019, 1:24pm UTC](https://community.info-beamer.com/t/low-voltage-detected/374/4 "2019-02-28T13:24:19Z")

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I have now connected the device with a HY3003 Gigimess power supply (3A max) - and I still have the problem.

[edit:] I suspect that it might have something with the splitting to do. I have another device on its own power without problems.

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**Author:** ![Wassini](https://community.info-beamer.com/user_avatar/community.info-beamer.com/wassini/32/203_2.png) [@Wassini](https://community.info-beamer.com/u/Wassini)\
**Post date:** [March 8, 2019, 1:53pm UTC](https://community.info-beamer.com/t/low-voltage-detected/374/5 "2019-03-08T13:53:25Z")

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Found the sollution: The used USB cable cannot provide enough power - so changing the wires to a thicker cable did solve the problem!

(PS: This is apparently my new account as LBWA account is closed)