(a) Your company plan to design an automatic hand sanitizer dispenser using ARM microcontroller that built in a 12-bit ADC as shown in Figure Q3(a)(1). GND OUVOUT Out HLVU lovin 11 UD AR 05mos miso SPIL RESI 20 USB le Serial - 9 p10 p11 12 pi 12 Serial NXP CORTEX LPC1768 120 CAN p.30 29 EP28 Serial 026 p25 PwmOut 224 po Analogin Analogous 12 MHz 22 BBBB Figure Q3(a)(i): The ARM microcontroller The sanitizer is powered with DC motor as the actuator to dispense the liquid. The motor comes with a driver that can be controlled digitally. The sanitizer will be triggered using an analog infrared proximity sensor, based on the distance from human's hand to the dispenser. The characteristic of the infrared sensor is shown in Figure Q3(a)(ii). You were requested to trigger the actuator when someone's hand is within 2.5cm. V 3.3 Voltage cm 0 10 Distance Figure Q3(a)(ii): Infrared Proximity Sensor Show your design for the problem with a schematic diagram, flow chart of your program including the detail in processing the analog and digital value of the sensors. The AD Global Data (ADGDR) register is given in Figure Q3(a)(iii) as your reference. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 X X x Figure Q3(a)(iii): AD Global Data Register (ADGDR) (b) Your supervisor suggested to adopt the Internet of Things (IoT) technology to further improve the sanitizer you designed. Please suggest ONE (1) major feature that you could think of [5 marks] (a) Your company plan to design an automatic hand sanitizer dispenser using ARM microcontroller that built in a 12-bit ADC as shown in Figure Q3(a)(1). GND OUVOUT Out HLVU lovin 11 UD AR 05mos miso SPIL RESI 20 USB le Serial - 9 p10 p11 12 pi 12 Serial NXP CORTEX LPC1768 120 CAN p.30 29 EP28 Serial 026 p25 PwmOut 224 po Analogin Analogous 12 MHz 22 BBBB Figure Q3(a)(i): The ARM microcontroller The sanitizer is powered with DC motor as the actuator to dispense the liquid. The motor comes with a driver that can be controlled digitally. The sanitizer will be triggered using an analog infrared proximity sensor, based on the distance from human's hand to the dispenser. The characteristic of the infrared sensor is shown in Figure Q3(a)(ii). You were requested to trigger the actuator when someone's hand is within 2.5cm. V 3.3 Voltage cm 0 10 Distance Figure Q3(a)(ii): Infrared Proximity Sensor Show your design for the problem with a schematic diagram, flow chart of your program including the detail in processing the analog and digital value of the sensors. The AD Global Data (ADGDR) register is given in Figure Q3(a)(iii) as your reference. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 X X x Figure Q3(a)(iii): AD Global Data Register (ADGDR) (b) Your supervisor suggested to adopt the Internet of Things (IoT) technology to further improve the sanitizer you designed. Please suggest ONE (1) major feature that you could think of [5 marks]
