In this project you need to combine the knowledge gained from the control theory and embedded control system theory to build an automatic closed loop control system.
Part 1 - 0-5v D to A converter
In this first section you are required to build an Arduino based DA converter. The main goal is to choose the converter parameters.
You are required to:
1. Design the system that produces 0-5V analog voltage output and displays main process variables using HyperTerminal (no scrolling). SP to be displayed in millivolts while PV to be displayed in per cent Include the raw value for both variables into your output.
2. Check the accuracy of the SP readings against your multimeter. Maximum deviation allowed is ±10mV.
3. The output voltage is to be set using a potentiometer connected to the pin Ao.
4. Limit the output of the A/D converter to 0-1000.
5. Make sure that the unfiltered PWM output reaches o% and 100%. Provide the appropriate oscillograms.
6. Check whether your system maintains the set point after applying a load to the output equal to the resistor of the RC filter. Do this check for SP=1V, SP = 2.5V, SP=4V. Provide suitable comments for each case.
Part 2- Voltage Tracker
In the second section you are required to build an Arduino based voltage tracker. The ultimate task of the system is to output analogue voltage that tracks the set point voltage. Set point sampling rate is toms.
You are required to:
1. Draw a detailed flow chart representing the control philosophy.
2. Design and plot the circuit diagram.
3. Assemble the system and capture the oscillogram showing the system response to sweeping the set point from 0 to V and back. Follow the requirements outlined below:
a) Use a potentiometer connected to pin Ao to generate the set point for the system.
b) The feedback is to be acquired via pin At
c) The PWM is to be generated using pin
4. Obtain an oscillogram that proves that the set point sampling rate is toms.
5. Check that your system maintains the set point after applying a load to the output equal to the resistor of the RC filter. Do this check for SP=1V, SP = 2.5V, SP=4V. Provide suitable comments for each case.
6. Modify your system so that you are able to control the set point via serial communication to a PC. The SP value is to be sent in millivolts. Demonstrate the system performance.
7. Suggest two principal ways to improve the system response time.