Help with gas sensor on PIC

[patece]

sir good day..
I would like to ask for a help..regarding the connection of MQ5 gas sensor to pic16f877a...is the diagram like the one in the mq5 datasheet..hope you understand because i'm a beginner, still confuse to do it..thanks..I am intending to use mikroc which is beginner's friendly..thank you very much..hope to hear you soon.

 

[imbichie]

Hi Patece,

I had attached the connection diagram of MQ5 you can directly connects the Vout to any of the Input port of the PIC and read the value and take the action.

You can set the reference voltage of MQ5 by adjusting the variable resistor.

View attachment untitled.bmp

 

[patece]

thanks sir for the response.what is the use of lm311?.is it possible not to use lm311 instead modify the code for mikroc?..what will be the computation in the program?.thanks..*** bless.

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thanks sir for the response.what is the use of lm311?.is it possible not to use lm311 instead modify the code for mikroc?..what will be the computation in the program?.thanks..*** bless.

 

[imbichie]

Hi Patece,

I had sent the full document to your mail ID jrexsal@yahoo.com

The LM311 is nothing but a Comparator.

You can find all about it in the document itself

 

[patece]

with that sir imbichie, it gives an output of 5 or 0V(LM311) which is being fed into the pic microcontroller input pin? correct me if I am wrong, Is that what we call interrupt? It act as a switch because it senses either 5 or 0V approximately? then it send just "gas leak" or "fire alarm"?.If you dont mind sir. could you explain to me the code?I understand it. however in the LM35 I am using the built in ADC of pic which I successfully made it. of course, the adcon0 and adcon1 is set to determine the function.hope to hear you soon sir imbichie. Thanks and more power.

 

[hd_uni_pro]

please send for me :
hd.uni.pro@gmail.com

 

[jayanth.devarayanadurga]

Post datasheet of your sensor module.

 

[hd_uni_pro]

datasheet and circuit .and any circuit can help me . for sensor h2s 3 pin and ch4 5 pin from :
this site i bought them :
**broken link removed**
**broken link removed**

i know want connect to micro with interface(opamp) or not interface Specially h2s

 

[jayanth.devarayanadurga]

The links you provided doesn't open.

 

[FvM]

The NDIR module has apparently a voltage output, for the pin connection you need to refer to additional manufacturer information, it's not given in the datasheet.

The H2S sensor is 3-electrode electrochemical cell that need to be operated in a potentiostatic circuit. https://en.wikipedia.org/wiki/Potentiostat

H2S sensors are mostly using zero bias voltage, I don't know for the particular sensor.

A practical circuit can look like this

 

[hd_uni_pro]

The links you provided doesn't open.

i check it .and 2 link opened

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thx FvM for help me .
Do you have a suggestion for sensor ch4

 

[FvM]

Analog output pin -> PIC ANx

 

[hd_uni_pro]

ok thx .
i connect ana output to avr or arm .
thank you for help