QUESTION 1 (20 MARKS) Figure 1 shows a light dependent resistor (NSL19-M51), a photodiode (SFH229), a potentiometer and

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Question 1 20 Marks Figure 1 Shows A Light Dependent Resistor Nsl19 M51 A Photodiode Sfh229 A Potentiometer And 1 (58.12 KiB) Viewed 10 times

QUESTION 1 (20 MARKS) Figure 1 shows a light dependent resistor (NSL19-M51), a photodiode (SFH229), a potentiometer and a temperature sensor (LM35) connected to USB Arduino Nano data acquisition board through an operational amplifier (TLV2741). The board consist of a microcontroller (ATmega328P) with a built-in analog to digital converter (ADC). The ADC allows conversion of analog input signals from 0 to 5 V to a 10-bit binary representation with 76.9 KSPS sampling rate and 5 V reference voltage. The maximum recommended impedance for analog sources at the analog input (A0 to A7) is 100 M2. a) An analog DC signal ranging from 0 to 20 V with 20 M2 source resistance need to be converted through the ADC input. Discuss how it can be implemented by minimizing all sources of errors. (4 marks) b) If an AC signal needs to be converted through the ADC input without any additional circuit, what are the considerations of the AC signal in order to get the best performance of conversion? (4 marks) c) The temperature sensor (LM35) is a factory calibrated to give an output sensitivity of 10 mV/°C. Discuss how it can be used to measure temperature in the range of 0 to 150 °C by connecting it to Arduino Nano board through the analog input. (6 marks) d) Discuss the calibration process in order to utilize the photodiode (SFH229) as a light meter. (6 marks) D DIV OOD 000 (3.0) Nano Arduino L AMI M 100 MF P COLOR 6V HV LM TL2741 da 09 IP +BV LOM L CR-47 OND+ Figure 1