Hi , everyone.
Currently I am using RFID M6e nano sparkfun with external power bank for power supplyment. Powerbank output is 5.1V(2.4A). It works well. Now I want to change wall adapter instead of using power bank. As i know, normally M6e nano use 3.7 V. What power supplyment should I use for wall adapter?
The Nano can handle 3.7V - 5V. I would use 5V as there is a diode on the board which drops the voltage about 0.7V. The supply to the logic as result is 4.3V . The ME6Nano will regulate that down to 3V used on the board internally. A level shifter on the board will turn the output signal to the provided input level (4.3V) You will need a strong power supply that can handle burst of power requests very well, like the one you currently have.
Thank you so much, Paul.