I have a microcontroller (in a radio controlled reciever)·that I want to test the outputs for ground or +5.
Can I use any old LED and a 470ohm resistor to verify the outputs?
My thinking is that the resistor will safely limit the current in the forward direction and that if the LED is backwards, the diode function will prevent and damaging reverse current.
Or, is there a risk that I will hurt the microcontroller?
I don't have a scope.· And, the instructions are in Chinese.
There are no specifications for maximum current outputs, so I am assuming 20ma and trying to use only 10ma.
I am having to·reverse engineering this.
Any· useful tips on how to safely do this kind of thing would be welcome.