Y2 Project Week 5

Members:
Qinglie Zhu, Zheng Zhao, Junhao Zhu, Zhiyuan Zhang

Advisor:
Valerio Selis

General Ideas:
In this week, the group succeeded in constructing the entire circuit consisting of amplifier circuit and ADC circuit. Furthermore, the algorithm of the sound monitoring system has been optimized as well. Next, in order to protect the circuit from damaging, the circuit was packaged. Finally, the design of poster is finished in this week.

Experience of the Experiment:
1.   Reconstruct the sound monitoring system
For the purpose of stability and beauty, the circuit was reconstructed in the lab. Differentiating from the previous circuit, the length of wires and pins were cut so that the components can be fixed in the breadboard. The entire circuit is shown as Figure 1 below.

 Figure 1. The Entire Circuit

2.   The Optimization of Algorithm
As for the algorithm part, the original one was optimized in this week. In detailed, the first part that needed to be optimized is the progress of calculating the voltage level of noise. The final design is to calculate the average value based on 50 measured value.

Apart from that, the second part that needed to be optimized is the process of calculating dB value of the noise. The first step the group did is to calibrate the microphone due to the unique characteristic of each microphone. What the group did is to compare the actual voltage level with a noise having a particular dB value. After choosing around 20 points, the formula of calculating dB value can be simulated by MATLAB. The result of simulation is shown as Figure 2 below.

 Figure 2. The Calibration Result

3.   Poster
The poster of introducing the sound monitoring system is finished as well.

Conclusion:

The whole design of sound monitoring system is completed on time. The hardware and software part are both finished.

Comments

Post a Comment

Popular posts from this blog

Y2 Project Week 4

Image
Members: Qinglie Zhu, Zheng Zhao, Junhao Zhu, Zhiyuan Zhang Advisor: Valerio Selis General Ideas: In last week, the biggest problem we countered was that the voltage gain of the amplifier circuit was not high enough, which was only 30. Consequently, the sound signal cannot be displayed normally on the oscilloscope and therefore the arduino could not read the correct analog value. In this week, our most important task is to think about a method to increase the gain. Additionally, we planned to connect the buzzer to the arduino and compile the code so that if the sound level transcends the threshold, the sound monitor system will warn the user. Experiment: 1. Increase the gain of the amplifier circuit We came up with two methods to increase the gain of the amplifier. Firstly, according to the research, the gain of LM386 amplifier can be set from 20 to 200 using a resistor and a capacitor across pin1 and pin8.  Figure1: The configuration of LM386 However...
Read more

Y2 Project Week 1

Image
General ideas: Our group aims to build a sound monitoring system which is able to detecting the sound level in a room. The whole design is based on the micro controller called Arduino Yun. As for the principle, the sound monitoring system is able to detect by a microphone, then amplify the signal and convert it into digital signal. Finally, display the sound level on the smart phone through bluetooth. Component: 1. Arduino Yun 2. Microphone 3. Amplifier OPA335AID 4. Chip LOG112 5. Differential Amplifier INA133 6. Bluetooth Description of Several components: 1. Microphone The microphone can detect the noise signal in a specific range. Therefore, the filter is not necessary in the sound monitoring system. 2. Amplifier OPA335AID The component is able to amplify the signal stably. Moreover, the cost is relatively low. The schematic of it is shown below. Figure 1. The Schematic of Amplifier OPA335AID 3. Chip LOG112 The chip has high accuracy with low power consump...
Read more