Switch

Switch is device for making and breaking the connection in an electric circuit.(Wikipedia)


Source:internet

In my electronics design i made hello board traces and i print that board.and print it on modela machine.


Then I solder that board and add the programm in this board through aurdino


programming to the board

In aurdino board we select aurdino as isp and we run that program for aurdino as isp the i connect the aurdino to the hello board as per the pin diagram.sck--pin13,miso--pin12,mosi--pin 11,rst--10,vcc--vcc,gnd--gnd

Then I oepn the button program and blink led program and i merge that both programme together.


After uploading succesfull to the aurdino then my board is worked.the first diagram showas my ied is on when board is connect to the supply


Then i press the buttun then buttun now act as ckt breaker and it turn off the led


Conclusion

in this part the buttun work as a switch and i understand that how input device paasing the signal to the board.

Gas sensor

This sensor helps to sense the lekage gas from lpg


Source:internet





Learning outcomes

we take a trial on gas we get the max gas here the we set that value at lekage loop and this value is match to sensor the message will be displayed

LDR

A photoresistor (or light-dependent resistor, LDR, or photoconductivecell) is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity. (basic electronics site )


Source:internet




First trial with normal light



Second trial with darkness on one ldr



Third trial with maximum light on one ldr



Learning outcomes

ldr is very user friendly after doing this trials i realize that this is the best for my final project and i will use it in my project the ldr output is decreses when darkness is present otherwise it is incresed

Temp.and humidity sensor

This sensor sense the surrounding temp.and humidity


Source:internet




Conclusion

TEMP IS sensoning with this sensor and it display using the serial monitor