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Y2 Project Week 4

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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, af
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Y2 Project Week 1

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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
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