The thing is this.
We don't know what you are doing wrong, despite all the back-and-forth questions.
If we can ever fathom what you are doing wrong then we could tell you not to do it, but so far we can't, so we cannot recommend some random device.
So far I don't think we know exactly what your 5 V power supply is, and a detailed, precisely focused photograph of your whole arrangement in bright, uniform light would be most illuminating.