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ELEEE 3230 LAB
LAB PROJECT:
Home Monitoring and Security Systems
June 2021
Experiments 1 & 2 &3
Home Monitoring and Security Systems
This lab project covers three experiments for lab 1, 2 and 3. In this project, you will build a Home Monitoring and Security System. Your design is supposed to monitor the entry, control the temperature of the house as well as watering of the plants based on the feedback from moisture sensor.
Objectives
• Gain familiarity with electronics used in control and monitoring systems
• Learn about electronic sensors
• Learn about electronic circuit design
Components/Software
• Electronic components as required by your design
• Power supply
• Breadboard
• 2N2222 Transistors
• OPAMP 741
• 1N4007 or 4148 Diodes
• Variety of resistors and capacitors
• LEDs or small speakers (given to you just for testing)
• Thermistor
• Hair dryer as the heating element
• Relay
Design Requirements:
The project has three phases. We suggest that each phase to be done in each lab session however you can sign off each phase in either of the three lab sessions. Please be advised that any part of the project that hasn’t been demonstrated and checked by the lab instructor in the first two sessions has to be ready for demonstration before the second half of the last session. Lab project phases are defined as:
Phase 1:
Design a monitoring system to detect opening/closing of any door or window in the house. Magnetic switches (a.k.a. Reed switches) are normally used for such detections, in conjunction with a transistor as a switch. For the beginning, use an LED or a light as an indicator; when a door opens an LED will lit. Then extend your design to use a relay to switch on a siren. A relay is an electromechanical switch that can be practically used to switch any device on and off, as long as the device power consumption is within the power rating of the relay switch contacts. Use a 6 VDC relay (with sufficient power rating for the contacts) to turn on the siren. The 6 VDC characteristic of the relay means that it requires 6 volts DC between its two input terminals, in order to turn on the contact switch. When the input voltage of the relay is close to +6V, the siren will sound and if the relay input is close to 0V the siren will go off Since the sound volume is low, you also need to design an amplifier to amplify the output of the siren by a factor of 10. Assume that you can remove the speaker of the siren and place a transistor amplifier (not an OPAmp) between the siren circuit output and the speaker, which has 8Ω resistance. Design the amplifier, and specify any valid assumptions.
Phase 2:
1- Design a ttemperature control system utilizing a relay again to turn a heater on and off. When the relay input voltage is close to +6V the heater will turn on and if the input is close to 0V the heater will turn off. Use this heater to maintain the temperature roughly between 20 to 22 degrees Celsius. Indicatee the temperature of the house when within 21 ± 1 degree Celsius, by turning on an LED or a light. Transistors (with their temperature dependency) are usually used as a temperature sensor. Alternatively, You can consider a thermistor as your temperature sensor.
Phase 3:
Design a plant watering control system using a 6 VDC relay (with sufficient power rating for the contacts) to turn on a small 110 VAC water‐ pump, to water the plants when moisture is low. You can decide how low the moisture should be in order to turn on the pump
You can consider two small metal plates inside the soil to implement a variable resistance or capacitance technique based on the moisture content in the soil
Pre-lab tasks
For this lab project, you must do the following prelab tasks:
2- Use Multisim to simulate your design for phase 1. You can consider both LED and siren as the output on your simulation simultaneously. Hint: for Reed switch simply use a manual switch in Multisim.
3- Use Multisim to simulate your design for phase 2. Use a “Temperature Sweep” on Multisim to see if your indicator goes ON/OFF at desired temperatures.
4- Use Multisim to simulate your design for phase 3 Hint:You can consider a variable capacitor in Multisim to simulate your circuit.
Lab Tasks
For each phase, you need to implement your design on breadboard, test and demonstrate the functionality to the lab instructor. You can use your own electronic components or any available components listed on section of this manual.
Hint: You don’t need a real switch to test your circuit. A jumper wire to connect or disconnect two points is a replacement for a switch.
To test the phase 3 design, a small planter filled with soil and your sensing mechanism could be used. You need to test it with dry soil and wet soil,
Lab Report Breakdown and Grading
Submit followings in a formal lab report:
1. A summary of your schematic design and techniques you used (15 marks)
2. Your hand calculations (20 marks)
3. Simulations and plots (25 marks)
4. Your test procedure results in a proper format (e.g. table format) (30 marks)
5. Conclusion is important including your findings and learning outcomes (10 marks)