ENG3020 - An Electric Vibrations Plate Controller Using Arduino, Eccentric Rotating Mass, Pivotal-Oscillation, Bar Linkage System - Engineering Assignment Help

Assignment Task -                 
 

AN ELECTRIC VIBRATION PLATE CONTROLLER USING ARDUINO 

A vibration plate or “power plate” is an exercise machine that sends high-speed vibrations through all of the muscles in your body. Using a vibration plate combined with a healthy diet and regular cardio will help you to achieve your fitness goals [1]. There are two movement patterns in vibration plates: linear vibration and pivotal oscillation. A linear vibration plate is a spring and eccentric wheels system. The rotation of the eccentric wheel generates a circular centrifugal force which drives the upper plate up and down in a regular oscillation. A pivotal oscillation plate is essentially a  planar four-bar linkage system driven by a motor through a belt. The belt transfers the motor power to rotate the crank wheel. The crank wheel is linked to the upper plate (the rocker) by the coupler bar. As the crank wheel rotates, the coupler bar drags the link point up and down. The upper plate moves exactly like a seesaw swinging on a fixed pivotal axis. The movement is literally called pivotal oscillation [2]. This rotary to reciprocal motion conversion is used in oil pumpjacks

The system in Figure 2 should meet the following user requirements. The user interface consists of a  TM1638 breakout board which has 8 pushbuttons, 8 LEDs, and 8 Digit Seven Segment Displays. The system has a brushed dc motor, a motor driver circuit, and an NTC temperature sensor connected to the case of the motor. When the motor overheats due to long term use or malfunctioning, the case temperature could reach temperatures greater than 70°C reducing its lifespan. The controller must stop the operation of the DC motor when the motor overheats (when the casing temperature exceeds 70°C). The motor driver has safety protection that measures the current flowing through it.  When this current is larger than 3A, the motor should stop and an error message should be displayed on the TM1638 breakout board. 

1. Design a signal conditioning circuit using an NTC thermistor that could measure temperature within 20?C to 100?C with ±3?C of tolerance. The output of this signal conditioning circuit should be interfaced to an Arduino Uno. The NTC thermistor used for this application is a  

NTC manufactured by Vishay and the ordering number is NTCALUG01A103F804A [5]. [10%]

2. Provide a detailed explanation of the DC motor driver circuit in Figure 4. Indicate the purpose of the diode D4 and the DPDT relay component. [5%]

3. Design a suitable signal conditioning circuit for the Motor current considering that the reference voltage of the ADC is 5V. The motor control driver circuit is shown in Figure 4 and the current shunt resistor value is 500mΩ. The output voltage of this signal conditioning circuit should be higher than 4.5V when the current flowing through the motor is 3A and less than 0.5V when there is no currently flowing through the motor (0A). [8%]

4. Draw a wiring diagram for linking the peripherals and the breakout board to the Arduino,  describing the I/O used by Arduino. [7%]

5. Implement a TM1638 test program that allows manual control of the vibration plate.  By default, the vibration plate is stopped. It starts running when pushbutton S2 is pressed.  When running, LED8 is ON and the elapsed time in seconds is displayed in the upper four 7 segment digits. The duty cycle as a percentage is shown in the lower four 7-segment digits which is 50% by default. It could be increased or decreased by 5% using pushbuttons S7 and  S8 respectively. 

When the vibration plate is running, it could be stopped at any time by pressing again S2.  When stopped, the timer is cleared and the PWM signal is disabled.  

The output of the motor current protection circuit is connected to the external interrupt in digital pin2 (INT0). When the motor casing temperature is higher than 70°C the motor

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