Why does my Raspberry Pi project keep displaying the 'lightning bolt' undervoltage indicator?

from blog Kevin Boone's website, | ↗ original
↗ original
The Raspberry Pi is widely used as part of a more complex electronic project or construction. There's a misconception that such a construction can be powered from the same cheap, nasty USB charger that is suitable to power a Pi on its own. Attempting to do this often leads to undervoltage situations. This article explains why, and what...