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Controller Unit

TODO: write a brief description (input, output, function of the subsystem, deployment method, etc...)

Table of Contents

* Decription
* System Overview
* Components Used
* A-Star Sensor
* PCB Circuit
* Inputs And Outputs

Description

In this part of the project:

* Data will be taken from air conditioner (Airwell) and sensors(A-star sensors)
* The read data will be saved to the database
* Air conditioning settings will be set according to the data from the web application

System Overview

TODO: Add Figure & Explain !!

Components Used

* Raspberry pi 3 B +
* A-Star Sensors
* Sparkfun ESP32 Thing

A-Star Sensor

This sensor consist of 4 component:

1 - Sparkfun ESP32 Thing
2 - DS18B20 Temperature Sensor
3 - DHT22 Temperature and Humidity Sensor
4 - 3.7V LiPo Battery

The connection between Sparkfun ESP32 Thing and DS18B20 Temperature Sensor is given below.

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Figure 1: Circuit Connection

Circuit Connection between A/C and ESP32

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Figure 2: Circuit Connection

PCB Circuit

In our project, Sparkfun ESP32 Thing is used to control air conditioners. The A/C communicates with a 5v logic signal, but Sparkfun ESP32 Thing uses a 3.3v logic signal. Therefore, a level-shifter circuit's are needed between these two. In addition, during our studies it was found that the TX signal was inverted and sent to the A/C. Therefore, an additional inverter circuit is designed. These circuits are shown in Figure 3 and PCB is shown in Figure 4.

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Figure 3: Circuit Schema

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Figure 4: Printed Circuit Board

For the control of the A/C and the display, the Sparkfun ESP32 Thing is connected to the A/C and the display. The signals from the A/C to ESP32 were processed. An oled screen has been added to monitor the condition of the A/C and any errors that may occur. This screen is preferred at 128x64 resolution. CommCB is shownunication with the I²C protocol was established between this display and ESP32. Reset button added for use in any unexpected situation. These circuits are shown in Figure 4.

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Figure 5: Circuit Schema ESP32 connect A/C And Display

Inputs And Outputs

Inputs

  1. A/C
  	* Mode (Cool/Fan/Dry/Heat/Auto)
  	* Fan Speed (Low/Medium/High/Auto)
  	* A/C Degree (16°C ~ 30°C || 60°F ~ 85°F)
  	* A/C Zone (or A/C ID)
  	* ON/OFF

  2. A-Star Sensor
  	* Degree
  	* Humidity
  	* Sensor ID

Outputs

  1. To A/C
  	* Mode
  	* Fan Speed
  	* A/C Degree
  	* A/C Zone (or A/C ID)
  	* ON/OFF

  2. To Database
  	* A/C Data (A/C ID, Mode, Degree, Fan, On/Off, Datetime)
  	* A-Star Sensor Data (Temperature & Humidity)