Audiometer Circuit Using Microcontroller AT89S51

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This is a design for audiometer circuit. This audiometer is an instrument used for the diagnosis threshold of human hearing to give some particular audio frequency and also a certain level of intensity. Raised from the signal generator sinus and selected using a multiplexer 4051. Amplitude or intensity of sound can be arranged through the DAC. Use as bait with the audio signal. Voltage to references from the DAC, so the output can be set with accuracy Vref/255. This is the figure of the connection of the circuit.

Procedure for programming the audiometer circuit is initial view will display the form fields Name and Date patients now on the Character LCD screen, which can be entered via the keyboard. After the data in the content of the system will wait for the emphasis the Enter key when keyboard enter key is pressed the system will start working on procedures audiometer. Through the multiplexer 4051 then selected the most low frequency, 125 Hz and data on the issue with the DAC will be issued with the signal frequency and amplitude particular. Interruption through the system timer 0, mode with 16 bit then remove the signals that can be set to increase amplitude for every 10 seconds: 0:05 x 200 = 10 seconds if the patient does not press the button, when 10 patients amplitude still does not listen to the sound of the automatic frequency raised to a higher level and again at the lowest amplitude. By using an external system interruptions 0, then we can do so that interruptions can be patient when the system starts listening to a sound. When patients hear then press the button so that there will be a process data storage dB and Frequency at the time. When the process is completed the system will re-open the data-data that have been stored for the data storage process is done.

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