Circuits for sensors

[Logendran]

Can anyone provide simplest circuits for IR sensor using IC741 ,Alcohol sensor and Vibrational sensor(Piezo electric sensor)???

 

[ynot.veera]

Here is the simplest IR sensor circuit...............If you want to buy alcohol sensor.Click this link
https://probots.co.in/index.php?main_page=product_info&cPath=9&products_id=375

It is Rs.225/-

 

[Logendran]

Thank You ynot.veera!.. Will you provide me Circuit for Alcohol sensor too??

 

[BradtheRad]

Some typical ways to use a signal from a sensor.



Frequently you include it as part of a voltage divider.

The transistor might be an NPN or PNP or you can use an op amp.

The rightmost example shows a comparator arrangement using an op amp.

You may need to experiment with placement of components, depending on whether you want output to rise as sensor resistance goes up, or as it goes down instead. Etc.