Project Design Document (PDD) The Dehumidifiying System Erdem Bahcivan

1.0 Architectural Design (Refer to PA4) 1.

The dehumidifier is to measure the data such as temperature, relative humidity, atmospheric pressure, For each of these variables a sensor is required to measure values. In total there are 2 sensors. Each of these sensors are connected thru the Raspberry PI where the analog signals are then converted to digital data. In addition, the information can be accessed using a mobile smart phone. 2.

The dehumidifier is connected to the microprocessor for computing the data collected from the sensors. Temperature and humidity sensors are connected to both the humidifier and the microprocessor. Analog signals that are obtained from the sensors will be converted with an Anolog to Digital converter (ADS), and a digital to analog converter(DAC) will be used to input data into the peltier chip and the fan.

Architectural Graphic:

2.0 Hardware Design Hardware will mostly be consisting of AD and DA converters that convert analog signals to digital signals and vise versa. I will be designing a FIR filter using Matlab that comes with a LP and HP filter designing toolbox which will be helpful finding the necessary filter coefficients for the input and output signals.

2.1 Theory of operation (required)

The microprocessor Raspberry PI 3 can connect to internet where it will gather information of current temperature and humidity and compare the data with current inputs coming from the sensors. The processor will implement in C programming language and is able to provide the necessary closed loop control of the system.

2.2 Schematics (required)

2.4 Timing Diagrams (as required)

Timing Diagram for Temperature Sensor

Timing Diagram for Humidity Sensor

Simple Configuration for Smart Phone Connectivity

Clock Timing and (ADC and DAC) Raspberry PI3

3.0 Software Design Software will mostly be consisting of receiving incoming and outgoing signals and implementing them with desired operations. I will be writing most of the codes on Matlab in C since it has a wide range of connectivity options that include extensive features Raspberry PI.

3.1 Software Inter-Relationships Block Diagram (required if not covered in Architecture Design)

Simulink Design for Temerature and Humidity Sensors

4.0 Glossary

Word or Acronym

Meaning in This Context

Peltier Chip Thermoelectric cooling uses the Peltier effect to create a heat flux between the junction of two different types of materials

Simulink A Matlab platform to design controllers and more.

5.0 Appendix – Reference documents and hardware interface details https://www.ijarnd.com/manuscripts/v3i2/V3I2-1221.pdf https://www.mathworks.com/help/simulink/