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Schematic principle of Park-Aid

2017-08-15 09:14  
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Park Aid


R1_____________10K   1/4W Resistor
R2,R5,R6,R9_____1K   1/4W Resistors
R3_____________33R   1/4W Resistor
R4,R11__________1M   1/4W Resistors
R7______________4K7  1/4W Resistor
R8______________1K5  1/4W Resistor
R10,R12-R14_____1K   1/4W Resistors

C1,C4___________1µF  63V Electrolytic or Polyester Capacitors
C2_____________47pF  63V Ceramic Capacitor
C3,C5_________100µF  25V Electrolytic Capacitors

D1_____________Infra-red LED
D2_____________Infra-red Photo Diode (see Notes)
D3,D4________1N4148  75V 150mA Diodes
D5-7___________LEDs  (Any color and size)

IC1_____________555  Timer IC
IC2___________LM324  Low Power Quad Op-amp
IC3____________7812  12V 1A Positive voltage regulator IC
The next show is park assistance circuit principle. Figure: IC1 forms an oscillator driving infrared LED through 0.8 milliseconds. 120 Hz pulse frequency and peak Current 300 mA. D1 and D2 are placed facing the car in the same line a distance of two centimeters, with a short chopping board fixed to the wall. D2 D1 extracted and generated infrared beam reflected on the surface placed in front of it.  Diode  D3, R5 & R6, make up a drop of the diode D4 forward. Signal amplification and peak detection IC2A D4 & C4. A dc voltage proportional to the distance D1 and D2 reflecting objects and feeds the voltage comparator inverting input of the three. These comparators switches, LEDs, refer to non-inverting input voltage at the set voltage divider resistor chain r10 r7.


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