Supply the 4 channel optocoupler relay using nodemcu
Posted: Thu Sep 20, 2018 1:31 pmHey, sorry for asking silly question,im beginner for electronics, so my question here, I supply the nodemcu with the usb wall plug, then i want to turn on and off using the blynk application, there is no problems regarding the coding, but the main problems here that can i connect the Vcc to the 3.3v of the nodemcu, gnd to gnd nodemcu, signal in to the digital pin nodemcu and the JDD-Vcc side to the VU of the nodemcu this jdd-vcc im only connected the vcc only to the VU and remove the jumper between Jd-vcc and VCC, is it possible to do that.I heard that VU is the output of 5v from the usb, is it will harm my board? Pls help ne im beginner here 