this is the link http://www.electronics-lab.com/projects/sensors/029/index.html i connect the circuit when i press the code the lamp red is light all the time i want to now if this circuit is good or not
i get from the site map of electronic loker . i connect the circuit but nothing has happen . i connect three time ,please check this map coz i want to work this in enginnering day in my university please any help