Audiometric Test Analyzer Using Smart Phone


Audibility problem is one of the major problems for human beings especially older ones. Hearing loss progress gradually and it is better to detect it at an early stage for corrective action. Audiometric tests are necessary to screen persons with hearing loss at an early stage. A low cost, user friendly instrument using smart phone has been developed. The software development for the audiometric test analyzer system is done in carbide C++ IDE in PC and is downloaded to the mobile through USB port. Thus the smart phone with a headset can act as an audiometric test analyzer system.The audiometric test analyzer generates test tones with different frequencies 250Hz, 500Hz, 1000Hz, 2000Hz, 3000Hz, 4000Hz at different amplitudes. The hearing status of the patient can be monitored for each amplitude and frequency and the status can be stored for further processing. The test result outputs are further analyzed to detect the defect of the ear tested.

Automatic Landscape Irrigation System

This is a microcontroller PIC 16f877A based system which can be used to irrigate the landscapes and lawns. The watering area can be divided into different zones and different time durations can be programmed for each zone. Two different start times can be programmed. The system works round the clock and the watering activity is initiated at the specified start times and will be automatically stopped after the time durations specified.The system include main relay, transformers, the microcontroller system with PIC 16f877A, small relays, switches, LEDs, LCD display and other components. Microcontroller allows the solenoid at each zone to open and close for selected intervals. A program key provided in the system allows to initiate programming of the time information. The current time, starting times and durations can be programmed using keys and is displayed in LCD display. When watering is initiated the zone number is displayed in the LCD along with the current time of the day.

Automatic tutoring system

Automatic Tutoring system was developed with the intension to provide a user friendly learning environment for the students. Automatic Tutoring System is a Web – based Learning tool. The study materials will be available every time for the student. Incorporating speech into the system can help the students learn, visualize the various topics and reproduce in a more effective manner. It gives a more natural interface. The time required for learning each subject can be reduced considerably. Automatic Tutoring System was developed to achieve the above goals .Topics in each Module are given as key points for the students to understand easily and figures & equations are also included .The possible questions are given at the end of the modules , the marks division and method of answering is explained for each question.

Oto Acoustic Emission Analyzer (OAE) using smart phone

Hearing loss is one of the pathologies with the highest prevalence in newborns. The recommended methods for early detection are based on Otoacoustic emissions (OAE) and/or auditory brainstem response (ABR). National Institute of Speech and Hearing (NISH) use Otoacoustic emission analyzer to test audibility of infants. Otoacoustic emissions measured in the ear canal are acoustic energy leakage from the biochemical reactions of a healthy cochlea. Otoacoustic emissions appear to originate from within the cochlea and propagate through the middle ear structures to the external auditory meatus. This can be measured with the aid of a sensitive microphone and signal analysis techniques. The important part in the implementation of the OAE is a probe with a microphone and loud speaker. The probe emits the stimulus signal into the ear of the patient. The loud speaker in the probe is connected to the analog output of the smart phone. The microphone in the probe records the response signal. The recorded signal is applied to the low-noise preamplifier with required amplification. This signal is then applied to the analog input of the mobile phone. Analytical methods such as Fourier transform and regression analysis can be applied to determine the defects of the ear tested.

Virtual Instrumentation using NI DAQ 6009


Electronics instruments like oscilloscope, function generator, pattern generator, logic state analyzer, multi meter, frequency meter, counter, continuity tester can be realized at low cost as virtual instruments using proper hardware and software. NI DAQ 6009 and Lab View software are used for realizing virtual instruments. Inputs and outputs are acquired and delivered through DAQ device connected to PC. NI USB DAQ 6009 has 8 analog input channels, 2 analog output channels,12 digital input/output channels, 1 counter(32 bit), 2 external voltages as +2.5v, +5v with a full-speed USB interface.


The One Channel Simple Scope acquires and displays the waveform from a single channel. Select your Device and Channel and run the VI. While running, you can adjust the vertical position and volts per division, as well as the time base.

Frequency Meter With Counter

This application written in LabView 7.1 shows how to use the simple event counter functionality of the USB-600X devices and the computer’s timer to calculate an approximate average frequency measurement of the signal on the counter channel. This functionality is not inherently available for the devices.

Function Generator

This program demonstrates how to perform continuous analog output tasks on the 6009 and also incorporates the theory of operation that is associated with software timed analog output. Continuous software timed analog output means that your analog channel will update only once for every iteration of the program’s loop. It is important to remember that these devices allow a maximum update rate of 150 samples per second on each channel; therefore the main program’s loop can iterate no faster than once every 6 ms. It is also important to remember that these devices allow an output voltage range of 0 to 5 Volts. For demonstration purposes, this program outputs a sine wave with a DC offset of 2.5V and allows the user to select the number of points per cycle. It will be observed that increasing the points per cycle will increase the resolution of the output waveform, but also decreases its frequency. The approximate period of the output waveform is equal to the points per cycle times the output rate.

Temperature and Humidity Measurement Using Labview

This program will measure the output voltage of humidity sensor and display the relative humidity and the LED will glow when the room humidity rises above the set up limit. It will show the result numericaly as well as graphicaly. (For this connect humidity sensor to any one of the analog input(ai0) and connect LED to any one of the digital output. Then type the cut off humidity as desired in comparison constant block. After this, execute the program. Results will be displayed.

Water Level Control System

Water level control system maintains the water level in tanks by switching the motor control. The level of water in the bottom tank / well is monitored and depending on the level of water in the lower and upper tanks, the motor is switched on and off. Provision for controlling the levels of up to three upper tanks. Time interval for checking the water level can be programmed in the microcontroller chip (PIC).

Power Control System

Power control system controls the switching on and off of the power in flashboards, refrigerators etc automatically. The time of the day is maintained by the microcontroller (PIC). Provision for programming the time of the day and the off time intervals. Up to two off time intervals can be programmed.