Let us see how to build your own custom Temperature sensing device using LM 35 sensor.
Components required:-
A 9 V battery
7805 IC [5 V regulator]
Bread Board
Connecting wires
LM 35
LM 358 op amp IC
A 1 kilo ohm resistor
10k POT
LED
To build this, you need to follow simple steps ---
1.Plug the 7805 IC into the bread board. According to the pin numbers of 7805 - Pin1 is input, Pin2 is GND and Pin3 is Output when the hump of the IC is facing you. Give the input of 9 V across P1 and P2. Take the output across P3 and make the power rails with a 5 V supply.
2.Connect Pin8 of LM35 to 5 V rail and Pin4 to ground rail.
3.Connect POT(10kOhms) variable pin to pin 1 and any fixed pin to pin 2 of LM358 opamp. Since we need to make the sensing above the room temperature,we will set the position of the variable end by turning the pot and adjust the LED to be having minimum glow later when battery is connected.
4.Connect a 1kOhm resistor between pin 2 and ground , which acts as feedback path.
5.Ground pin 3 of lm358 and connect pin2 of temperature sensor IC(LM35) to pin 3 of the OPAMP. Connect pin 1 of Temperature sensor IC to VCC and Pin3 of it to ground.
6.Connect an LED anode to pin1 of LM358 OpAmp and its cathode to ground(-ve) in breadboard.
7. WATCH THE LED GLOWING IN YOUR OUTPUT..!!!! JUST HEAT THE LM35 WITH SOLDERING IRON OR MATCHSTICK AND WATCH THE LED CHANGE ITS INTENSITY.!
According to the temperature increase, intensity of LED light increase.
FOR BUYING THE COMPONENTS YOU CAN VISIT THE LINK:-
www.nimeshelectronics.com/
#temperaturesensing #opamp #voltageregulator
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8 сен 2018
