SELF PARKING CAR

HOW A SELF PARKING CAR WORKS?
The self parking car sensor works on the principle of echo. The car to be parked using the self parking technique is taken into the parking lot and the system for self parking is started by pressing a button. It then starts searching for a parking space. Whenever there’s a car besides it, it senses it and keeps on moving forward until it finds an empty space. When it does, a counter placed in the system starts counting till the dimensions of the car and keeps sensing the output at every fourth step. If no obstacle is found till it completes counting for the dimensions of the car, then the counter is reset back to its initial value and the parking process starts. The left wheel becomes stationary and the right wheel starts reversing at 90 degrees. It then moves back and parks the car.

The ultrasonic transmitter used here is operated at 40Khz with nearly 50% duty cycle. The frequency is generated using IC 555 in astable mode. The output is given to an ultrasonic transmitter.

The reciever is used to detect the reflected sound. The output of an ultrasonic transducer is given to the input of a non inverting amplifier with a gain of 221. The amplified signal is then given to the rectifier which rectifies the amplified sound wave. The RC filter is connected in cascade with the rectifier. The RC filter has time constant RC greater than 1/40k sec=2.5*10-5 sec. the output of RC filter is a stable DC voltage which is then given to a comparator which gives 1 as an output when an object is detected and 0 when no object is detected.

.FUTURE SCOPE OF SELF PARKING CAR

The motto of our project is to let the sensors park the car so that the driver can sit back and relax while the sensors do all the work for him. Our project can however be modified to perform a huge variety of functions.
Many car manufacturing companies are coming up with a self parking system. In case of narrow roads there’s always a turning problem. The car driver faces great difficulty while taking a turn. In such a case our project comes handy. If certain modifications are made in the sensor program such that the car takes a full 180 degree turn instead of a 90 degree turn then this problem can be easily solved and turning the car becomes very easy.
Our model is designed to park in only one direction. It can however be designed to park in either direction. Another problem that can be overcome is “obstacle avoidance”. In this case the sensors can be programmed in such a way that if a car comes too close to our car then the sensors will detect its closeness and will automatically slow down our car to avoid any accident.

SOLAR ROBOTS

Hi junkers !
This time I have managed to build a solar robot which completely uses solar energy to drive itself.A solar battery is not that simple to drive a motor as it seems to be because small solar cell have low current rating in addition to variable voltage proportional to light intensity.the voltage of a solar cell drops when it is connected to load implies it has a very bad regulation for high loads , the voltage developed for low intensity light is so less that it cannot drive a motor hence a circuit is used so that it stores energy in a capacitor and when sufficient charge is stored it should release it instantly so the schematic shown below does the same it's called the "solar engine"
WORKING: Initially the capacitor is at 0V and transistor Q1 is in cut-off state ,when the cell is exposed to light the capacitor starts charging up to a voltage of 0.7(cut in Si transistor) Q2 + 1.67*n(cut in FLED Red LED)(n = number of LED's)when the capacitor charge's above 0.7+1.67*n transistor Q2 come in conduction and supplies base current to Q1 through 2.2K .Thus Q1 is now in conduction and the motor turns as the capacitor discharges to 0.7V again Q1 and Q2 are in cut off and capacitor again charges and the cycle continues .

BUILD YOUR OWN PC OSCILLOSCOPE

Do you want to build your own oscilloscope then check out these links
using sound card


want faster one then check out this
using parallel port

refer pictures

INFRARED SWITCH

Hello friends !
I have finally managed long range wireless remote with a range of about 15 meters ! Infra-red switch/proximity detector/obstacle detector/remote e.t.c.

CIRCUIT DISCRIPTION
Transmitter:
I have used two ic 555 both in astable mode, one is used to produce a carrier of approximately 38 KHz nearly 50% duty cycle and the second another is used to produce data signal nearly 20 Hz alternate 1 and 0
Nearly 50 % duty cycle. The output of the data signal generator is connected to the reset pin of the carrier ic producing 38 KHz carrier to produce small bursts at the rate of 20 Hz.
Receiver:
Receiver is the most important part of this chain, I have used TSOP1738 (very sensitive) as the detector, read the datasheet before using it, the TSOP1738 is immune to unmodulated carrier 38khz infra-red, hence the 20 Hz data signal is used to modulate the carrier.The output of the TSOP1738 is given to a missing pulse detector which is basically IC 555 in monostable mode having time constant 1.1RC greater than 1/20 sec
Schematics and pictures are shown below

PARALLEL PORT INTERFACING

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Hello visitor !

This is my first PC interfacing project via parallel port, I have interfaced my RC car via parallel port .Although in this case I have managed readymade code for it ,you can also write your own in C language, it’s quite easy you have to use inport and outport instructions ,search on net for it.

You can control 8 bits at a time; here is the URL from where I got the code

Instead of the transistors used as shown in the site I have used ULN2003/ULN2803 as they prove cheap and easy to solder .Go through the data sheet of the above mentioned IC’s before soldering them .So what are you waiting for ?

OBSTACLE AVOIDING ROBOT

The above circuit is taken from robotroom.com. Visit the page for some interesting fun projects.


Hi junkers !
This is an autonomous robots which uses ultrasonic sensors (40 KHz), which can detect obstacles from 45 cm or less when ever it detects an obstacle it rotates its direction by 180 degrees .Well I am not providing any serious technical stuff because I am quite busy in my academics these days, but if you want to know it schematics more just plug on to Google for an hour or so. If you want to increase its range increase the power supply to 15 volts or increase the operating frequency above 40 kHz and for its faithful detection use more than one sensor.

My team-mates without whom the project would't have been possible:
1>DIVESH DAVE
2>SANKET GHOTEY
3>SAGAR GHOTEY

SCREWING WATER

WARNING: Imitating to construct this kind of boat may be dangerous. Self discretion advised.
This was our first attempt to make a boat totally from junk.We have used cell metal covering to build custom made propellers, ball pen refill and cycle spoke as crankshaft and two rusty motors one for propulsion and one for turning the boat. Styrofoam as chassis or base, an RF transmitter receiver and a 9 Volt battery. The basic catamaran design slices through when you don't have to turn.
Two of my friends with whom I shared the idea and motivation are:
1>Divesh Dave
1>Apoorva Karnik