Since there are a lot of issiues with underpowered boards, this ‘White Paper’ should explain why it’s recommendet to think about the powering situation of your board (especially if it’s powered throught micro USB).
It’s all about Ohm’s Law (eq. 1), your SBC needs a defined voltage (U) and current (I). So the only variable that we can influence is the resistance (R)!
The micro USB cable which powers our board acts as resistor between the output of the power source and
**UPDATE August 9 2018**
After some messing around I determined I had some sort of contaminant on my Tinker Board GPIO pins interfering with their conductivity. I have rerun my GPIO powering test and added the results below, there is no additional drop ( @tkaiser, @Frank Wu I apologize for the bad information) Other small updates include a possible reason for the small voltage reporting measurement error.
After having received an official Tinker Board Power supply, I submit m