Rangkaian Sensor Parkir dengan Infra Merah

Skema Rangkaian Sensor Parkir dengan Infra Merah. This circuit can be used for an assist in parking the car near the garage wall backing up Pls. LED D7 illuminates Pls bumper-wall distance is about 20 cm., D7 + D6 illuminate at about 10 cm. and D7 + D6 + D5 at about 6 cm. In this manner you are alerted Pls approaching too close to the wall.

Car Parking Sensor circuit

All distances mentioned before can vary, depending on infra-red transmitting and receiving LEDs used and are mostly affected by the color of the reflecting surface. Black surfaces lower greatly the device sensitivity. Obviously, you can use this circuit in other applications like liquids level detection, proximity devices etc.

Note:

• The infra-red Photo Diode D2, should be of the type incorporating an optical sunlight filter: these components appear in black plastic cases. Some of them resemble TO92 transistors: in this case, please note that the sensitive surface is the curved, not the flat one.
• Avoid sun or artificial light hitting directly D1 & D2.
• If your car has black bumpers, you can line-up the infra-red diodes with the (mostly white) license or number plate.
• It is wiser to place all the circuitry near the infra-red LEDs in a small box. The 3 signaling LEDs can be placed far from the main box at an height making them well visible by the car driver.
• The best setup is obtained bringing D2 nearer to D1 (without a reflecting object) until D5 illuminates; then moving it a bit until D5 is clearly off. Usually D1-D2 optimum distance lies in the range 1.5-3 cm.

List Component of Car Parking Sensor circuit:

R1             : 10K
R2,R5,R6,R9    : 1K
R3             : 33R
R4,R11         : 1M
R7             : 4K7
R8             : 1K5
R10,R12-R14    : 1K
C1,C4          : 1µF/63V
C2             : 47pF
C3,C5          : 100µF
D1             : Infra-red LED
D2             : Infra-red Photo Diode (see Notes)
D3,D4          : 1N4148
D5-7           : LEDs (Any color and size)
IC1            : NE555
IC2            : LM324
IC3            : LM7812 

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Car Parking Helper Circuit

A simple but useful circuit to solve the problems with parking car, in spaces without good visibility.  The electric circuit appears in picture 1. It is constituted by the IC1 and components round he.  When the car bumper touch soft and push lightly the switch S1 then of battery voltage + 9 V it is applied in the circuit, the transistor Q1 turn ON and the diodes D3-4 they blink. After 4 seconds the capacitor C1 charging.  The pin 9 of IC1c it goes in high potential, simultaneously the pin 10 goes in low potential and Q1 turn off and the diodes turn off and the circuit it remains in situation of waiting, until the next excitation of switch S1.  

 The consumption in the this stage remains very small, without it aggravates the battery.  The use in the place of D1, Flash Led is not indispensable.   Led it can replaced with one simple led 5mm, the lighting then will remain continuous for 4 seconds and then it will close.  We can change the time that remains turned on the Led changing the capacity C1. With C1=10uF the time goes up in the 10 seconds.A opinion of placement of switch S1 appears in picture 2.  The circuit, the switch S1 and the battery, are placed in a box, which is not influenced easy by the humidity.  The two Led can with a cable be placed somewhere highest, so that they are visible from the driver seat.   The place of S1 can be varied with types of switches such as push ON with plate.  Suitable adaptation and extension of plate it can become as long as need.   In the end of plate put a small piece of elastic, in order that when car bumper touch on it, it does not destroy the colour.  

Parts List

IC1=4093 R1 = 10Kohms 1/4W C2 = 100nF 100V MKT

Q1=BC550 R2=1Mohms 1/4W J1=2pin Connector

D1=1N4148 R3 = 4.7Kohms1/4W S1=sw normal open

D2=Led 5mm Red normal or Flash R4 = 820ohms 1/4W 9V battery with clip

D3=Led 5mm Red normal C1=4.7uF 25V [for ~4sec delay time]

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