Sensor interface to microcontroller

Opamp used as comparator in combination with a LDR and a light source to form a logic output of zero or one suitable for microcontroller input.Pls reduce the voltage to 5 volts

Category:

Science & Technology

Tags:

• diy
• electronics
• gadget
• computer

[milabut]

Thanks .My mother tongue is not English as I am from India. We speak English as it is written in books with clear letter wise pronunciation unlike the west where many letters are by accent are omitted.We then find it also too difficult to understand that English.Hope you shall appreciate the same and bear with me .Our type of English accent can be followed by all non English speaking people very well. More over such technical A/Vs are for engg students to learn practical electronics better.

[milabut]

Thanks, but few have complained that my accent is non English ,how do you find it?Of course my mother tongue is not English so it may not match to that of US standards.

Better take for the reference voltage the pot not for the LDR

[milabut]

Take LP339 instead of LM339 both are same.To change the power value right clck on the power and then write on the box that appears +12V (for 12 volt for example)

[1974faraz]

Sir would u like to tell me which software u are using .

thanks

[milabut]

@1974faraz

it is proteus from labcenter UK

[schoorl200]

@milabut I am by no means complaining milabut as you try to explain things and obviously put a lot of work in it. Nevertheless, yes, your english is sometimes difficult to follow. It has nothing to do with your english not being correct (because it is correct), but more with accent and pronounciation.

[aerofart]

Nice explanation, Professor. I always enjoy your lessons.

I designed a circuit similar to this using two AND gates and two LDRs for use in a photo-vore robot . . . works very well. I suggest using a potentiometer in the voltage divider circuit for the signal voltage pin, or even for the reference voltage . . . makes it easier to fine-tune for the differences in resistance in the LDRs . . .

[alitou001]

please how do you set the power value ?

I am trying to simulate this circuit but it generates an error (no model specified for the LM339) ,i have the version 7 . did you face such error while trying to simulate this circuit?if so please tell me how did you get it to work. thank you.

[milabut]

@heberorozco

it is proteus from labcenter UK

[smashbirdie]

very nice explanation, keep posting. Thanks