DOUBTS about wiring circuits

[AslanPeter]

Hi Guys,
forgive me, it is surely a silly question but i am stuck. i need to control a LED with an output pin of a 8051 micrcontroller. basically the micrcontroller is running a code and when a condition is verified ,an output pin is cleared. this ouput is linked to the anode of a LED which should be wired to the VCC via a resisitor. the resistor and LED should be placed on a dedicated bread board which hence should be connected to 5v voltage. what should I do with the GND section on the broadboard?? should i leave it unconnected? will the VCC wire make any sense on its own withOUT GND? or RATHER should i power up the breadboard and connect instead a resistor leg to the VCC output of the power supply? which is the correct way and why?
thank you

 

[john blue]

VCC wire make any sense on its own withOUT GND? NOPE

Depending on your output port which you will be set to VDD or GND, if VDD then the +ve of the LED should connect to the uC and -ve to GND and vice versa. You still need to power up your 8051? If so, how can your GND be hangging?

 

[incomplete_jerin]

Connect the +5 v supply to the controller Vcc n connect the LED to the port of the controller with +ve side on the port pin n -ve side along with a resistance of 220ohm(desirable) to ground. Without proper grounding ur circuit WON'T work. :wink: