For example, the LED is not bright, this situation is the LED and the resistance between the wire connection is not caused by (the general components must have a wire connection, if the component is dragged directly to the back, it seems to go up, actually is disconnected)
Drag the resistor and find that there is no connection
LED is normal after connection
Perhaps you will find that the LED is still not lit when the connection is normal, you should pay attention to the resistor value setting
For example, the 5k resistance, the LED is not lit
When the resistance is set to 2k is very dark, this indicates high resistance, generally we set to 100 or 200
Finally, if you find the connection is normal and the resistance value is low, the LED is still not bright, it is likely that your LED is reversed, note the connection in the diagram
Proteus solve the problem of LED diode non-luminous