In summary, the conversation discusses creating a circuit for a science project that automatically opens a dustbin lid when a person passes by. Possible components include a proximity sensor, microcontroller, servo motor driver, and servo motors. Fresnel lenses and infrared sensors are recommended for people sensing. It is also suggested to use a solenoid or passive infrared sensors for a simpler approach. Sparkfun.com is suggested as a resource for further information.
hi everyone! for my science project, i want to create a circuit which automatically opens the lid of a dustbin when a person passes by the dustbin. Is there a particular type of circuit that i can use to accomplish this?
What do you mean by particular type of circuit?
The general idea would be something like -
proximity sensor --->Microcontroller--->servo motor driver-->servo motors.
Proximity sensor, like an ultrasonic sensor or infrared sensor etc would sense the person and send a signal to a Micro.
Micro would then drive a servo motor thru a servo drive circuit. The servo motor would open the lid.
You could eliminate the Microcontroller and wire the sensor directly to the servo drive circuit.
Servo motors are generally more difficult to work with than DC motors. If you are trying to keep this as simple as possible, use a DC motor and limit switches.
For people sensing, Fresnel Lenses are frequently used.
Doing a Google search, this site came up. Not familiar with them, so cannot guarantee that they are OK. http://www.epanorama.net/sff/Alarms...otion_Detectors/Infrared People Detectors.pdf
Even simpler than a motor, use a solenoid from your old washing-machine to open the lid.
Also look for Passive InfraRed (PIR), like your porch light thing-a-ma-bob, and close range IR sensors to trigger the thing. Once again I recommend sparkfun.com ...