Serial port bluetooth module electical connections

I’ve gotten my project to work with the bluetooth bee module, and now I’m trying to switch to the smaller “bee-less” bluetooth module (SKU: WLS123A1M). For the bee module I only needed 4 pins hooked up: +3.3V, RX, TX, and Gnd.

My question is this: what are the absolute minimum pin connections that I have to make? So far I have +3.3V, RX, TX, and the grounds at pins 13, 21, and 22. What else to I need (pull the reset pin to high, for example)?



It can work fine as your connection. Of course you can refer to other people’s project here.


Thank you sir! :smiley: