WEEK 20 - LED CIRCUIT

This led circuit is for show the signal of alarm gas detected and as lamp. At  here has 5 led with different colour for each one, 2 led for alarm system and the others 3 for lamp. This function when the mq2 sensor detected gas  and the lcd show data. After that the alarm triger, at this time the led on. There has 2 led for alarm system, 1 red led for the alarm and means danger. The others 1 is blue led for show the house safe. 

WEEK 19 - BUZZER CIRCUIT

The buzzer is functionaly as a alarm. This function when the mq2 gas sensor detect the gas and the lcd show the signal and then the alarm will triger. As long as the gas is detectd. When the gas is not detect the gas shutdown. The pin that we use for buzzer is pin 9, this pin pulse width modulation(PWM).

WEEK 18 - LCD CIRCUIT

               This lcd circuit is use for show the signal if the MQ2 gas sensor detect leakage gas in the house. The pin that used is 2,3,4,5,11, and 12. This all have been set by arduino board for lcd usage circuit.

WEEK 17- CIRCUIT FOR GAS SENSOR

In this circuit, the connection for each pin has been selected for input and output.the reason we use a A1 as the pin is about the analog input that we set for MQ2 gas sensor. The 10k resistor in figure 3.8 that change with variable resistor 15K ohm.

WEEK 16 - ROUTER

The router is use for connection between ethernet shield and arduino to internet. The router decide for fyp is must can connect with modem. This because i dont have wifii and need to bring to anywhere the router for make it portable use.

WEEK 15- BUZZER

A buzzer or beeper is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric. Typical uses of buzzers and beepers include alarm devices, timers and confirmation of user input such as a mouse click or keystroke. The price is around Rm 1.50 at Jalan Pasar, Kuala Lumpur.

WEEK 14- MQ2 GAS SENSOR

MQ2 gas sensor                                                                                    MQ2 holder

               Gas Sensor(MQ2) module is useful for gas leakage detecting(in home and industry). It can detect LPG, i-butane, methane, alcohol, Hydrogen, somke and so on. Based on its fast response time. measurements can be taken as soon as possible. Also the sensitivity can be adjusted by the potentiometer.