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speed limit alert full report - mohammed rufeen - 10-04-2017 SPEED LIMIT ALERT Presented By: GROUPMEMBERS ARUN.C BAIJU.B.N AVINESH.S ANAND.C.G RAHUL MENON.S SARABHAI INSTITUTE OF SCIENCE AND TECHNOLOGY MINIPROJECT 2009-10 BATCH NO:1 INTRODUCTION We propose to design and build an automobile speed limit alarm which notifies the driver of excessive speeds linked to a speed limit sign by a wireless link. This alarm will sound when the driver exceeds the speed limit by a specified amount. PROJECT GOALS One of our goals for this project are to successfully design a wireless speed-limit alert circuit which is capable of reducing road accidents Another goal to setup compactable device which can be mounted in vehicles like cars BLOCK DIAGRAM EXPLANATION Components Required R1,R2,R19__1K 1/4W Resistors R3-R6,R13,R17_100K 1/4W Resistors R7,R15__1M 1/4W Resistors R8__50K 1/2W Trimmer Cermet R9__470R 1/4W Resistor R10__470K 1/4W Resistor R11__100K 1/2W Trimmer Cermet R12__220K 1/4W Resistor R14,R16__68K 1/4W Resistors R18__22K 1/4W Resistor R20__150R 1/4W Resistor C1,C7__100 F 25V Electrolytic Capacitors C2,C3__330nF 63V Polyester Capacitors C4-C6__4 7 25V Electrolytic Capacitors D1,D5__Red LEDs 3 or 5mm. D2,D3__1N4148 75V 150mA Diodes D4__BZX79C7V5 7.5V 500mW Zener Diode IC1__CA3140 or TL061 Op-amp IC IC2__4069 Hex Inverter IC IC3__4098 or 4528 Dual Monostable Multivibrator IC Q1,Q2__BC238 25V 100mA NPN Transistors L1__10mH miniature Inductor (see notes) BZ1__Piezo sounder (incorporating 3KHz oscillator) SW1__SPST Slider Switch B1__9V PP3 Battery Circuit Diagram CIRCUIT OPERATION IC1 forms a differential amplifier for the electromagnetic pulses generated by the engine sparking-plugs, picked-up by sensor coil L1. IC2A further amplifies the pulses and IC2B to IC2F inverters provide clean pulse squaring. The monostable multivibrator IC3A is used as a frequency discriminator, its pin 6 going firmly high when speed limit (settled by R11) is reached. IC3B, the transistors and associate components provide timings for the signaling part, formed by LED D5and piezo sounder BZ1. D3 introduces a small amount of hysteresis. D1 is necessary at set-up to monitor the sparking-plugs emission, thus permitting to find easily the best placement for the device on the dashboard or close to it. After the setting is done, D1 & R9 can be omitted or switched-off, with battery saving. During the preceding operation R8 must be adjusted for better results. The best setting of this trimmer is usually obtained when its value lies between 10 and 20K. You must do this first setting when the engine is on but the vehicle is stationary. The final simplest setting can be made with the help of a second person. Drive the vehicle and reach the speed needed. The helper must adjust the trimmer R11 until the device operates the beeper and D5. Reducing car's speed the beep must stop. L1 can be a 10mH small inductor usually sold in the form of a tiny rectangular plastic box. If you need an higher sensitivity you can build a special coil, winding 130 to 150 turns of 0.2 mm. enameled wire on a 5 cm. diameter former (e.g. a can). Extract the coil from the former and tape it with insulating tape making thus a stand-alone coil. Circuit's current drawing is approx. 10mA. If you intend to use the car s 12V battery, you can connect the device to the lighter socket. In this case R20 must be 330R. Depending on the engine's cylinders number, R11 can be unable to set the device properly. In some cases you must use R11=200K and R12=100K or less. If you need to set-up the device on the bench, a sine or square wave variable generator is required. To calculate the frequency relation to RPM in a four strokes engine Hz= (Number of cylinders * RPM) / 120. For a two strokes engine the formula is: Hz= (Number of cylinders * RPM) / 60. Thus, for a car with a four strokes engine and four cylinders the resulting frequency @ 3000 RPM is 100Hz. Temporarily disconnect C2 from IC1's pin 6. Connect the generator's output to C2 and Ground. Set the generator's frequency to i.e. 100Hz and regulate R11 until you hear the beeps and LED D5 flashes. Reducing the frequency to 99 or 98 Hz, beeping and flashing must stop. advantages Its outstanding feature lies in the fact that no connection is required from circuit to engine Low power consumption It enables the driver to keep his or her eyes 'on the road' because instead of having to frequently look down at the speedometer to check the speed the instance of exceeding the chosen speed is communicated aurally Compactable and affordable application Adaptable with most internal combustion engine vehicles LIMITATION One and only limitation is that it is not suitable for diesel engine vehicles. REFERENCE electronics-lab.com miningaustralia.com Our sincere thanks to PROF: RAVI NAMBIAR (HOD EC DEPT.) PROFRABHAKARA WARRIER(ASST HOD) DEEPA.V.T RESHMI (PROJECT GUIDE) CONCLUSION DEVICE IMAGE MODERN TRENDS THANK YOU Read Full report http://khaterehelectronic/files/23.pdf speed limit alert full report - karthik - 10-04-2017 to get information about the topic "speed limit alert full report" refer the page link bellow http://seminarsprojects.net/Thread-speed-limit-alert-full-report?pid=58618#pid58618 |