Pre-Confirmation to our Project (Automatic Room Lights)

Automatic Room Lights         

Hye Guys, great to have all of you right now because we already have the very interesting thing to share…Here are the pre-confirmation of our new project for this subject. Check it out guys! J

· When a person enters the room it gets one pulse and the lights come ‘on.’

· Person goes out it gets another pulse and the lights go ‘off.’ It has a small memory which

  enables it to automatically switch ‘on’ and switch ‘off’ the lights in a desired fashion.

· These counters make use of Johnson decade counter CD4017 ICs.

· The sensors are installed in such a way that when a person enters or leaves the

  room

·  When a person enters the room, first he would obstruct the light falling on LDR1,

  followed by that falling on LDR2

·  Since the bottom half portion of circuit is identical to top half, this time with the

  departure of each person red portion of bi-colour LED is lit momentarily and

  output of  IC4 advances in the same fashion as in case of IC3.

· The bulb connected to the supply via N/O contact of relay RL1 also lights up

·  The maximum number of persons that this circuit can handle is limited to four

  since on receipt of fifth clock pulse the counters are reset

·  Additional inverters, AND gates and diodes will, however, be required