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Please answer all question. Subject: IoT (d) The thermistor in Figure 3a were then connected to a wheatstone bridge to work as the sensing circuit.

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Please answer all question.

Subject: IoT

(d) The thermistor in Figure 3a were then connected to a wheatstone bridge to work as the sensing circuit. [Thermistor dalam Rajah 3 a kemudian disambungkan pada titi Wheatstone bagi bertindak sebagai litar pengesan.] Figure 3 [Rajah 3 ] (i) Calculate the voltmeter reading at 0C and 100C if R1,R3,R4 is 10kOhm and the 10K3A1 sensor is used as the thermistor. [Kirakan bacaan voltmeter pada suhu 50,25 dan 100C sekiranya R1,R3 dan R4 adalah 10k Ohm dan penderia 0.3K3Al digunakan sebagai termistor suhu.] (5 Marks / Markah) (ii) Modify the bridge design if the client requires that the bridge is balanced at 0C. [Ubahsuai rekabentuk titi tersebut sekiranya pelanggan memerlukan titi tersebut seimbang pada 0 darjah.] (3 Marks / Markah) (iii) Calculate the power dissipation of the thermistor at 100C. [Kirakan pelesapan kuasa bagi termistor tersebut sepanjang julat pengukuran.] (2 Marks / Markah) MiniSense 100 is 2 pin analog vibration sensor that is able to detect vibrational forces on its axis. It is an active vibration sensor that offers high sensitivity at low frequencies and does not require any external excitation current to operate. The sensor has a high output sensitivity of 1V/1g force and the output AC signal could swing up to 90V. An example response of the sensor when vibrated with 20g force is given in Figure 5. The sensor has 2 pin connection which is GND and SIGNAL. [MiniSense 100 merupakan penderia getaran analog yang mampu mengesan getaran pada paksinya. Ia merupakan penderia aktif yang memberikan kepekaan tinggi pada kadar IV/Ig getaran dan isyarat AC yang diberikan penderia tersebut mampu mencapai 90V. Contoh tindak balas penderia tersebut apabila diberikan As an engineer, you were tasked in developing an IoT remote monitoring system with cloud connectivity. Integrate the sensor into your system and propose a solution to monitor machine vibration between 20Hz to 1kHz. [Sebagai seorang jurutera, anda ditugaskan bagi membangunkan peranti IoT bagi sistem pemantauan jarak jauh dengan sambungan awan. Integrasikan penderia ini dalam sistem dan cadangkan cara penyelesaian bagi memantau getaran mesin di antara 20Hz hingga 1kH.] (a) Draw the block diagram of your proposed system and explain the function of each block. Justify your selection. [Lukiskan gambarajah blok bagi sistem yang dicadangkan dan terangkan fungsi bagi setiap blok. Jelaskan pemilihan anda bagi pengawal sistem.] (4 Marks / Markah) (b) Draw a flowchart for the working system to alert users of vibrations above 10g. [Lukiskan carta alir bagi sistem yang dicadangkan bagi memberi amaran pada pengguna sekiranya getaran melebihi 10g.] (4 Marks / Markah) (c) The output sensitivity of the sensor is too high for most IoT devices. Design a solution to reduce the sensitivity of the sensor from 1V/1g to 0.1V/1g force. [Kepekaan penderia tersebut adalah terlalu tinggi bagi kebanyakan peranti IoT. Rekabentuk satu penyelesaian bagi mengurangkan kepekaan penderia tersebut dari 1V/Ig getaran kepada 0.1V/Ig getaran.] (4 Marks / Markah) (d) Assuming the IoT device utilizes a 10-bit ADC with an input limit of 1V, design a protection circuit to limit the input to 100g force after the circuit proposed in (c). Explain your design. [Andaikan peranti IoT tersebut menggunakan ADC 10-bit dengan had masukan IV, rekabentuk litar perlindungan bagi mengehadkan nilai masukan kepada daya 100g selepas litar yang dicadangkan dalam (c). Jelaskan rekabentuk yang anda cadangkan.] (4 Marks / Markah) (e) Propose a suitable network communication protocols and cloud services implementation for the system to allow the system to be connected and monitored remotely from the Internet. [Cadangkan komunikasi rangkaian, protokol dan perkhidmatan awan yang bersesuaian untuk sistem bagi membolehkan sistem dicapai dan dipantau dari Internet.] (4 Marks / Markah)

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