UltraSonic Parking Assitant (AVR)
Do you have a garage that is nearly too small for your automobile? Do you ever park farther than necessary from objects simply because you are scared to pull any closer? The Ultra-Sonic Parking Assistant allows you to park your car in front of any obstacle at any desired distance with no guesswork.
It works by emmitting a continuous stream of ultrasonic pulses from the front of your car and using the return times of the pulses to calculate distance. The current distance is then displayed on your dashboard, so you can easily judge how much farther you have to go. At the same time, the device emmits a sequence of audible beeps, the rate of which varies with distance. At close range, the beeps fade into a constant tone. You can quickly then learn to park as close as possible without diverting your eyes from your windshield.
This Parking Assistant is the perfect gift for the person in your household who enjoys useful gadgets. In addition, anyone who has a visual impairment due to age, disease, or otherwise can appreciate the benefits the Parking Assistant provides
High Level Design
The point of the Parking Assistant is to record and accurately relay to the driver the distance to the closest obstacle in front of his or her car. In addition, It gives the driver audible cues so that he or she may park without diverting his or her attention. To perform these tasks, we knew that the system had to be relatively accurate, and perform updates at a high enough rate to be useful.
The parking assistant utilizes two Atmel AT90S8515 microcontrollers connected via one-way radio link. One microcontroller is mounted to the front of the car in a protected area or even behind the grill. Connected to it are an ultrasonic ranger capable of measuring distances in the range of 3cm to 3m and an AM digital radio transmitter. This controller continually transmits ultrasonic pulses via the ranger and measures their return times.
Following each return pulse, the microcontroller calculates the distance to the obstacle based on a fixed formula. It then transmits each distance using the attached transmitter to the second Atmel MPU which is equipped with a matched receiver.
In addition to the receiver, the second MPU is connected to a miniature speaker and an LCD. The LCD displays the current distance in centimeters, while the speaker emits short pulses with a period that varies directly with distance.
Three additional features are available through 3 of the pushbuttons available on the STK200. Button 7 calibrates the distance to 0 every time it is pressed, button 6 resets the receiver to report absolute distance, and button 4 toggles the speaker on and off, in case it becomes an annoyance to the driver.
Link: http://instruct1.cit.cornell.edu/courses/e...ts/s2001/tmh25/
Do you have a garage that is nearly too small for your automobile? Do you ever park farther than necessary from objects simply because you are scared to pull any closer? The Ultra-Sonic Parking Assistant allows you to park your car in front of any obstacle at any desired distance with no guesswork.
It works by emmitting a continuous stream of ultrasonic pulses from the front of your car and using the return times of the pulses to calculate distance. The current distance is then displayed on your dashboard, so you can easily judge how much farther you have to go. At the same time, the device emmits a sequence of audible beeps, the rate of which varies with distance. At close range, the beeps fade into a constant tone. You can quickly then learn to park as close as possible without diverting your eyes from your windshield.
This Parking Assistant is the perfect gift for the person in your household who enjoys useful gadgets. In addition, anyone who has a visual impairment due to age, disease, or otherwise can appreciate the benefits the Parking Assistant provides
High Level Design
The point of the Parking Assistant is to record and accurately relay to the driver the distance to the closest obstacle in front of his or her car. In addition, It gives the driver audible cues so that he or she may park without diverting his or her attention. To perform these tasks, we knew that the system had to be relatively accurate, and perform updates at a high enough rate to be useful.
The parking assistant utilizes two Atmel AT90S8515 microcontrollers connected via one-way radio link. One microcontroller is mounted to the front of the car in a protected area or even behind the grill. Connected to it are an ultrasonic ranger capable of measuring distances in the range of 3cm to 3m and an AM digital radio transmitter. This controller continually transmits ultrasonic pulses via the ranger and measures their return times.
Following each return pulse, the microcontroller calculates the distance to the obstacle based on a fixed formula. It then transmits each distance using the attached transmitter to the second Atmel MPU which is equipped with a matched receiver.
In addition to the receiver, the second MPU is connected to a miniature speaker and an LCD. The LCD displays the current distance in centimeters, while the speaker emits short pulses with a period that varies directly with distance.
Three additional features are available through 3 of the pushbuttons available on the STK200. Button 7 calibrates the distance to 0 every time it is pressed, button 6 resets the receiver to report absolute distance, and button 4 toggles the speaker on and off, in case it becomes an annoyance to the driver.
Link: http://instruct1.cit.cornell.edu/courses/e...ts/s2001/tmh25/