Power warning (yellow lightning bolt)

[abasel]

I am using the following power supply: https://www.jaycar.co.nz/mean-well-70w- ... y/p/MP3289 which delivers 5V and enough AMPS.

Any ideas as to why the power warning might be happening.

I am feeding it using a USB cable that I have spliced into the power supply.

[rpdom]

The USB cable might have thin wires inside that can't carry enough current. Note that the official Pi power supply has very thick wires.

[B.Goode]

In addition to what @rpdom has suggested, maybe the PSU is not performing within its advertised specification. A 5 volts output with regulation of 2% looks as though it should be adequate. But we don't know what your unit is actually delivering and whether it is stable under working conditions.

[abasel]

Hi all thanks for that. I check the PSU and it's delivering 5V.

The power lead though is very thing. I took a standard cable and cut it.

Would recommendations do you have on how one creates a suitable power lead?

[B.Goode]

I check the PSU and it's delivering 5V.

It is unlikely that your own checks will be as accurate, pertinent, or responsive to transient ( very short-term ) dips in the supplied voltage as the power monitoring circuitry built in to the RPi system chip.

Would recommendations do you have on how one creates a suitable power lead?

There is no 'standard' usb cable.

Thicker is better. The official Raspberry Pi Foundation Power Supply https://www.raspberrypi.org/products/ra ... er-supply/ has 18AWG conductors.

[LTolledo]

how about DIY your microUSB power cable using

thicker wires VCTF 2 x 0.75mmsq

and micro USB plug (either needs soldering or screw-in types)

[abasel]

I made a cable to connect to GPIO inputs as per https://www.modmypi.com/blog/how-do-i-p ... spberry-pi. I used some thicker speaker cable, hard to measure diameter but it looks heavy duty enough.

Image can be seen here: https://prnt.sc/ke6s3i

Same issue.

[abasel]

Ok so yip it was the cable thickness. Dug around for some thinker cable (only had 1.35mm) and viola it all works. Amazing how much one learns by actually doing.

Thanks all