Measure sound pressure level and spectrum analyzer with FHT using Arduino and module sensor MAX4466
Nguyen Duy Quang, Nguyen Dinh Nguyen, Dang Thanh Tin
1 Faculty of Electrical & Electronics Engineering, Bach Khoa University, Ho Chi Minh City, Vietnam
2 Faculty of Electrical & Electronics Engineering, Bach Khoa University, Ho Chi Minh City, Vietnam
Abstract— By measuring sound levels, we can tell where a quiet enough or a place is contaminated by noise. Then, designers offer soundproofing solutions suitable for each location such as home or library,…
Keywords— measure sound levels, arduino, max4466
I. INTRODUCTION
Today, sound pollution is one of the social problems[1]. It significantly reduces the concentration of an individual or a
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Also, if the sensor is a pure mic then when the noise level changes but the voltage measured from analog pins of Arduino is not change because with ADC, assume that reference 5V it needs 5/1024 = 4.8mV to inscrease 1. Therefore, the small analog signal (such as the tranquilizers) must pass through the amplifier and then the Arduino reads the voltage on the amplifier. Conversely, for loud tones can cause sampling to be useless because the reading signal is always at 5V (1023), it is important to neutralize the gain factor to measure.
B. Module MAX4466 ?
This module is well suited for audio changer, recording, sampling and audio-reactive projects that use FFT. It has a small pot at the back of the module for gain adjustment from 25 to 125
Using this module is also very simple, GND pin for ground, Vcc for 2.4-5VDC. For Arduino types such as NANO or UNO R3, the 3.3V source is the most stable, least disturbed source, so we will use this source instead of the 5V source. The output signal will be Vcc / 2 when it is complete-ly quiet..
On this module, we have a range of values from 0 to 1023. It’s mean the voltage fluctuate from – MAX to MAX. So 512 mean “0” in
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Firstly, our microphone is not sensi-tive to all frequencies, it is still quite pure, we need filter the noise first manually. Secondly, it is extremely hard to re-produce sound signals at all frequencies exactly the same level, it depend more on the quality of speaker. High-end products will overcome this situation to measure the dB value accurately. Thirdly, because the human ear is not sensitive equally to differences frequency, there’s one unit apply different weights to different frequency dBA (A-weighting) and it is used for professional devices
The design used four of the Schmitt triggers. 3.3.2 Resistors R1, R2 and R3 – 10kΩ 10kΩ value was used for all three resistors to maintain consistency. R3 – 1kΩ The R3 resistor was used as part of the amplifier component.
555 is a very commonly used IC for generating accurate timing pulses. It is an 8 pin timer IC and has mainly two nodes of operation: mono-stable and a-stable. In external resistor and capacitor whereas in a-stable mode the frequency is controlled by two external resistors and a capacitor. It has a frequency of about 100 Hz [1]. The CD4033 has provisions for automatic blanking of the non-significant zeros in an easily readable display consistent with normal writing practice [2].
Valid values are 0 to 8. data – Up to 64 bits of application data may be transmitted.
The MAX232 is a dual receiver/driver and it converts the TX, RX, CTS and RTS signals. The drivers provide RS-232 voltage level outputs (approx. ± 7.5 V) from a single + 5 V supply via on-chip charge pumps and external capacitors. The receivers reduce RS-232 inputs (which may be as high as ± 25 V), to standard 5 V TTL levels. These receivers have a typical hysteresis of 0.5 V and a typical threshold of 1.3 V. Figure 4.16: Pin Diagram of MAX232 4.13 RS232 Interface
Macro Description HUGE_VAL It is used as a result of the function and cannot be represent as a floating point number. However if the magnitude of the result is quite large then the function will be set to errno to ERANGE value in order to indicate a range error. It will returns a very large value and named as macro HUGE_VAL or its negation (- HUGE_VAL).
MIB510 ρrovides an RS-232 serial...interface for mote ρroģramminģ and data receivinģ. Here MIB510 is connected...with the terminal for data aģģreģation. The
Chase Myers 6th 12/8/17 How important was technology in the 1930? In Bud, Not Buddy, the setting is the 1930's. The main character Bud suffered in many ways. His mom died when he was at age 6. He has had a bad foster family.
Will you be using a between-subjects or within-subjects design? If you have more than one IV, you need to answer this question separately for each IV. I will be using within subjects design. The participants will be given the same treatment during the experiment.
Hearing loss can affect high frequency tones, mid frequency tones and /or low frequencies depending on the loss.(ASHA,
Question 1 a. In detail, elucidate how your device is representative of/different from the physiological environment. Indicate how these variables may affect neural functionality. In order to record neuronal signals, my device, specifically the electrode, will be inserted into the rat sciatic nerve to record extracellularly the action potential generated by the neurons. There are several differences between the electrodes and the medium into which they will be inserted.
19.386526 -67.45 -44.1 20.53525 -68.39 -44.1 21.75204 -68.56 -44.1 23.04093 -67.97 -44.1 24.406191 -67.25 -44.1 25.852348 -66.75 -44.1 27.384196 -66.66 -44.1 29.006812 -66.79 -44.1 11.54782 -67.25 -44.1 12.232071 -66.3 -44.1 12.956867 -65.38 -44.1 13.72461 -64.56 -44.1 14.537844 -64.01 Adrian Bersiks_bersik_Acoustic Analysis_Excel.xlsx-44.1 15.399265 -63.86 -44.1 From the figure above there are no interpolation points above the reference line, which means the frequencies were bounded nicely under the maximum amplitude, and the greatest amplitude was captured on the sampling interval exactly, with a closer distribution in amplitudes. Again the 130Hz drop is consistent. Looking at the Excel spreadsheet, the resposnse almost mimics the
AC1.1 Assess the suitability of a range of monitoring techniques for customers’ complaints. There are a large variety of techniques used to monitor complaints such as: Feedback/evaluations Monitoring sales Monitoring returns
Woof woof ! You killed me by misleading my owner into thinking that microchipping pets is reliable and safe. In reality, microchipping is a tedious and excruciating process for any pet to go through. Animals should not have to be put through the process of microchipping like I had to. This hurts us
The purpose of this lab was to observe the phenomenon of resonance in an open ended cylindrical tube and use resonance to determine the velocity of sound in air at regular temperatures. A hypothesis for this lab was that if the frequency of the tuning fork increased, then the length of the tube to achieve resonance will increase because of the high amplitude of the vibration. The resonance of the open-closed tube was found through these steps. First, the tube was filled with water with an inner tube inside the outer tube. The water temperature was measured.
Next, a basic stock solution was used to prepare various concentrations ranging from 1.0 x 10-8M to 1.0 x 10-1M by serial dilution. The tissue was washed by overflow with reservoir’s solution for 5 seconds to obtain baseline before adding 0.1ml, 0.3ml and 0.5ml for each concentration respectively into the tissue bath. The tissue’s peak response for each final bath concentration(FBC) was measured and recorded. Rmax and EC50 of histamine were recorded.