# Car Parking helper

Posted on Apr 17, 2012

A simple but useful circuit for all they have problem 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. The manufacture of circuit does not have any difficulty, has however small difficulty in the mechanic manufacture and adaptation of switch S1. A opinion of placement 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. In the place of S1 can various types of switches are placed push ON with plate [see picture 3]. 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 him, not destroyed the colour. Part 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 [see Fig. 2+3 and text] 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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