*1 COMPONENT

For the beginning of this sem, i choose to complete all my require component and tools. The example of tools is breadboard, jumper and so on. For component, there is 2 component that i had change. Which brand of the sensor and wifi shield.

#AOSONG to DHT11
For temperature and humidity sensor,  i decided to change the brand of the sensor, which is from AOSONG to DHT11. This is because, DHT11 is more familiar compare to AOSONG, so it is more easier for me to get the information for this DHT11, compare to AOSONG. Beside that, the price of DHT 11 is affordable to me.

AOSONG AM2320

DHT 11

          

CHANGE TO

#Arduino WiFi Shield to WiFi Module
Then, for next component is, i had make a decision to change Arduino WiFi Shield to WiFi Module. The main reason i change this component because of the price. The price of the Arduino WiFi Shield is extremely expensive compare to WiFi module. Since the title of my fyp is Development of LOW-COST Air Quality Monitoring, i had consider for this price side. Moreover, the function of WiFi Module and Arduino WiFi module is slightly same.

Arduino WiFi Shield

WiFi Module ESP8266

CHANGE 

TO

#AOSONG DHT11

Product Overview 
DHT11 digital temperature and humidity sensor is a composite Sensor contains a calibrated digital signal output of the temperature and humidity. Application of a dedicated digital modules collection technology and the temperature and humidity sensing technology, to ensure that the product has high reliability and excellent long-term stability. The sensor includes a resistive sense of wet components and an NTC temperature measurement devices, and connected with a high-performance 8-bit microcontroller.

Applications 
HVAC, dehumidifier, testing and inspection equipment, consumer goods, automotive, automatic control, data loggers, weather stations, home appliances, humidity regulator, medical and other humidity measurement and control.

Features 
Low cost, long-term stability, relative humidity and temperature measurement, excellent quality, fast response, strong anti-interference ability, long distance signal transmission, digital signal output, and precise calibration.


#WiFi MODULE ESP8266

Description: The ESP8266 WiFi Module is a self contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to your WiFi network. The ESP8266 is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor. Each ESP8266 module comes pre-programmed with an AT command set firmware, meaning, you can simply hook this up to your Arduino device and get about as much WiFi-ability as a WiFi Shield offers (and that’s just out of the box)! The ESP8266 module is an extremely cost effective board with a huge, and ever growing, community.

This module has a powerful enough on-board processing and storage capability that allows it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, including the front-end module, is designed to occupy minimal PCB area. The ESP8266 supports APSD for VoIP applications and Bluetooth co-existance interfaces, it contains a self-calibrated RF allowing it to work under all operating conditions, and requires no external RF parts.

There is an almost limitless fountain of information available for the ESP8266, all of which has been provided by amazing community support. In the Documents section below you will find many resources to aid you in using the ESP8266, even instructions on how to transforming this module into an IoT (Internet of Things) solution!

Note: The ESP8266 Module is not capable of 5-3V logic shifting and will require an external Logic Level Converter. Please do not power it directly from your 5V dev board.

Note: This new version of the ESP8266 WiFi Module has increased the flash disk size from 512k to 1MB.

Features:

• 802.11 b/g/n
• Wi-Fi Direct (P2P), soft-AP
• Integrated TCP/IP protocol stack
• Integrated TR switch, balun, LNA, power amplifier and matching network
• Integrated PLLs, regulators, DCXO and power management units
• +19.5dBm output power in 802.11b mode
• Power down leakage current of <10uA
• 1MB Flash Memory
• Integrated low power 32-bit CPU could be used as application processor
• SDIO 1.1 / 2.0, SPI, UART
• STBC, 1×1 MIMO, 2×1 MIMO
• A-MPDU & A-MSDU aggregation & 0.4ms guard interval
• Wake up and transmit packets in < 2ms
• Standby power consumption of < 1.0mW (DTIM3)

So, this is the current complete component that i will used for my Air Quality Monitoring System;