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DESCRIPTION AND WORKING:
This automatic door opener can be made using readily availablecomponents. The electromagnetic relay at the output of this gadget can be used to control theDC/AC door-opener motor/solenoid of an electromechanical door opener assembly, with lightintervention in its electrical wiring.
A laser diode (LLED1) is used here as the light transmitter. Alternatively,you can use any available laser pointer. The combination of resistor R1 and diode D1 protectsthe laser diode from over-current flow. By varying muliturn trimpot VR1, you can adjust thesensitivity.(Note that ambient light reflections may slightly degrade The performance of hisunit.))Initially, when the laser beam is falling on photo-transistor T1, it con-ducts to reverse-biastransistor T3 and the input to the first gate (N1) of IC1 (CCD4001) is low. The high output atpin 3 of gate N1 forward biases the ED-driver transistor (T4) and the green standby LED(LLED2) lights up continuously. The rest of the circuit remains in standby state. When someoneinterrupts the laser beam, photo-transistor T1 stops conducting and transistor T3 becomesforward-biased. This makes the output of gate N1 go low. Thus ED-driver transistor T4becomes reverse-biased and LED2 stops glowing. At the same time, the low output of ate N1makes the output of N2 high. Instantly, this high level at pin 4 of gate 2 triggers the monostablemultivibrator built around the remaining two gates of IC1 (N3 and 4).Values of resistor R8 andcapacitor C1 determine the time period of the monostable.

This automatic door opener can be made using readily available
components. The electromagnetic relay at the output of this gadget
can be used to control the DC/AC door-opener motor/solenoid of an electromechanical door opener assembly, with slight intervention in its
electrical wiring.A laser diode (LED1) is used here as the light transmitter. Alternatively, you can use any available laser pointer.
The combination of resistor R1 and diode D1 protects the laser diode
from over-current flow. By varying muliturn trimpot VR1, you can adjust
the sensitivity. (Note that ambient light reflections may slightly degrade the
performance of this unit.) Initially, when the laser beam is
falling on photo-transistor T1, it conducts to reverse-bias transistor T3 and
the input to the first gate (N1) of IC1 (CD4001) is low. The high output at
pin 3 of gate N1 forward biases the LED-driver transistor (T4) and the
green standby LED (LED2) lights up continuously. The rest of the circuit
remains in standby state. When someone interrupts the laser beam, photo-transistor T1 stops conducting and transistor T3 becomes
forward-biased. This makes the output of gate N1 go low. Thus LED-driver
transistor T4 becomes reverse-biased and LED2 stops glowing. At the same time, the low output of gate N1 makes the output of N2 high. Instantly, this high level at pin 4 of gate N2 triggers
the monostable multivibrator built
around the remaining two gates of IC1
(N3 and N4). Values of resistor R8 and
capacitor C1 determine the time period
of the monostable.  T.K. Hareendran Laser-guided Door Opener s.c. dwivedi
The second monostable built around IC2 (CD4538) is enabled by
the high-going pulse at its input pin 12 through the output of gate N4 of
the first monostable when the laser
beam is interrupted. As a result, relay
RL1 energises and the door-opener
motor starts operating. LED3 glows to
indicate that the door-opener motor is
getting the supply. At the same time,
piezobuzzer PZ1 sounds an alert.
Transistor T5, whose base is connected
to Q output (pin 10) of IC2, is used for
driving the relay. Transistor T6, whose
base is connected to Q output of IC2,
is used for driving the intermittent piezobuzzer.
‘On’ time of relay RL1 can
be adjusted by varying trimpot VR2.
Resistor R9, variable resistor VR2 and
capacitor C3 decide the time period of
the second monostable

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laser guided door opener

[attachment=17023]
IC CD 4001


Buffered Inputs and Outputs
Standard Symmetrical Output Characteristics
100% Tested for Maximum Quiescent Current at 20V.
Low power TTL
Noise Margin (Over Full Package Temperature Range):
1V at VDD = 5V
2V at VDD = 10V
2.5V at VDD = 15V


PIEZO BUZZER


.A buzzer or beeper is an audio signaling device, which may be mechanical, electromechanical or piezoelectric.
.The piezo buzzer produces sound based on reverse of the piezoelectric effect. The generation of pressure variation or strain by the application of electric potential across a piezoelectric material is the underlying principle.

.The Red lead is connected to the Input and the Black lead is connected to Ground.


CIRCUIT DESCRIPTION



A laser diode (LED1) is used here as the light transmitter. Alternatively, you can use any available laser pointer. The combination of resistor R1 and diode D1 protects the laser diode from over-current flow. By varying muliturn trim pot VR1, you can adjust the sensitivity.(Note that ambient light reflections may slightly degrade the performance of this unit.) Initially, when the laser beam is falling on photo-transistor T1, it conducts to reverse-bias transistor T3 and the input to the first gate (N1) of IC1 (CD4001) is low. The high output at pin 3 of gate N1 forward biases the LED-driver transistor (T4) and the green standby LED (LED2) lights up continuously. The rest of the circuit remains in standby state. When someone interrupts the laser beam, photo-transistor T1 stops conducting and transistor T3 becomes forward-biased. This makes the output of gate N1 go low. Thus LED-driver transistor T4 becomes reverse-biased and LED2 stops glowing.


ADVANTAGES


.The laser costs low, better quality security (as it is only point to point) and very large bandwidth.

.It can be used as multi appliance control.

.It consumes low power thus it works on normal 12v battery.

.It has a separate circuit so it cannot be affected by an external interference.