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Student Projects
Contact information
University: Catholic University of Daegu
Team Members: Kang hyung soon(3th), Kim seon jik(3th), Shin in tae(3th), Kang byung moon(4th), Lee ga eun(4th)
Submission Language : English
Project Information
Title: Distant Sensor for hearing-impaired People
Description: the idea of the team is a device for the hearing impaired person, Ultrasonic sensors and microphones, vibration sensors in LabVIEW by integrating a device that recognizes the sound indicating th distance to obstacles and dangers to people with disablilties.
Products: NI myRIO-1900, LabVIEW 2013
The Challenge:
hearing impaired person are unavle to hear what is a congenital or acquire factor. So deaf would result in a lot of inconvenience due to not hear the sound indicating the risk around. Currently the equipment or method wide spread is hearing impaired to hearing aids. cochlear implant surgery, various medical devices for the hearing impaired, TV programs or sign language used in everyday life, such as alarms and the prople around you can tell when and emergency. If you are hearing impaired person will be able to avoid accidents when fear and obstacles the sound informing you that the risk of walking around. So applying the biomedical enguneering, and outputs the signal to the distance and be able to recognize the sound vibrations of sound and the distance if deaf to inform the obstacles and dangers while walking made the program
The solution
Our team's device is to recognize measuring the distance through ultrasonic sensor device and microphones, vibration sensors, and LabVIEW. So deaf people are able to recognize the sound informing about the dangers of coming away with obstacles from the rear
(1) Application of LabVIEW
Our team was integrating with LabVIEW programs through ultrasonic sensors and micriophones, vibration sensors, myRIO. The sound signal to inform risk is measured by microphone and the distance of obstructions is mesured by the ultrasonic sensor input in LabVIEW program through myRIO. Output signal can give you a warning to hearing impaired prople about the distance of obstacle and informing dangerous sound according to level of sound and distance of obstacle.
(2) Ultrasonic sensor
The sensor sends ultrasonic waves to the object accroding to the trigger pulse sent from the transmitter of the ultrasonic sensor SRF-05. The ultrasonic waves are reflected from the object and received by the receiver. Then the receiver amplifies the ultrasonic waves to the echo pulse and the distance is mesured by using the operator(a simple principle).
The trigger pulse takes the role of a switch command that indicates when the sensor should output 40kHz.. When this trigger pulse is received thourgh the pin, it is onverted to a physical vibration at the transmitter and the transmitter outputs ultrasonic waves. The reflected ultratonic wavs are then received by the receiver and the receiver converts the physical vibration into electrical pulses. These pulses are compared to the transmitted pulses and output as echo pulses to indicate the time difference. The pulse received vy the receiver are smaller than the transmitted pulses because the ultrasonic waves were distributed through being reflected by the object and attenuated by crashes with the air. The pulses received by the receiver are amplified and compared to the transmitted pulses to calculate the distance. The distance can then be measured by using the time difference between the received pulses and the transmitted pulses.
(3) Vibration sensor(MB-1203V)
When an object comes within a specific distance, LabVIEW signals the NI myRIO-2900 and the vibration sensor to operate the sensor. This sensor is operated by our device through different sounds to let the hearinf-impaired person recognize an object within a distance of 50cm.
(4) Microphone(AUX TCM-110)
Element : electric condenser with F.E.T. Circuit
-pickup pattern : OMNI-DIRCTIONAL
-Frequency response : 50-18,000Hz
-Sensitivity : -52dB
-Low-frequency roll-off : 150Hz, 6dB/octave
-Impedance : 1000 ohm
-Battery type : mercury battery
-Cable length : 5M PLUS 1M(6M) -30'
-Dimensions : 11/16" LONG X 5/16" DIA.
figure 1 : Our device fully assembled
(5) NI myRIO-1900
This module is equipped with 10 analog inputs, 6 analog outputs, 40 digital I/O lines, wireless, LEDs, push buootn, accerlerometer onboard. and Xilinx FPGA and dual-core ARM Cortex-A9 processor, Programmable with LabVIEW or C; adaptable for different programming levels. It receives the trigger pulses from the ultrasonic sensor SRF-05 and uses them to measure the intervening distance and transmit echo pulses to LabVIEW.
Conclusion
Our device relay to hearing-impaired person to recognize the distance and to feel the dangerous sound. As Biomedical Engineering students, we designed developed a distance recognition device using the distance sensor and microphone, vibration sensor for hearing- impaired people. We successful complete device development and combined this device with LabVIEW. However, there are some limitations to our device. This device where deaf people is not a lot of use. It can be confusing for hearing impaired person because the distance of ultrasonic sensor and perimetic noise consistently are measured by ultrasonic noise consistently are measured by ultrasonic sensor and microphone. In addition, the ultrasonic sensor SRF-04 has a wide pointing angke. For greater precision in obstacle recognition, sensors with a lower pointing angle and wider measurable distance should be developed. Further work remains to design a way to wear or carry our device, which also requires the addition of technology to make it compact.
