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Electronics => Electronics => Topic started by: l_e_a_88 on April 16, 2011, 04:25:59 AM

Title: Urgent, HELP ME Please: How to amplify PIR sensor output voltage to 5Vand 12V?
Post by: l_e_a_88 on April 16, 2011, 04:25:59 AM

Hey guys! =)

can anybody help me?

i wanna know how to amplify the PIR sensor output voltage?
the PIR sensor output voltage is about (0.6V-0.8V) and i would like to amplify it to 5V and 12V to control my 5V LED lamp and 12V DC Fan circuit.....

anyone know how to do it??  


 Thank you so much!

Title: Re: Urgent, HELP ME Please: How to amplify PIR sensor output voltage to 5Vand 12V?
Post by: Soeren on April 16, 2011, 12:53:04 PM

Hi,

Quote from: l_e_a_88 on April 16, 2011, 04:25:59 AM

i wanna know how to amplify the PIR sensor output voltage?

There's a lot of ways to do it and it can be done with op-amps or transistors, so what do you know/prefer?

Quote from: l_e_a_88 on April 16, 2011, 04:25:59 AM

the PIR sensor output voltage is about (0.6V-0.8V) and i would like to amplify it to 5V and 12V to control my 5V LED lamp and 12V DC Fan circuit.....

Is the 0.6V to 0.8V when it senses movement or at rest?
You probably want the LED and/or the fan to stay on for a while when the PIR have sensed movement, so what do you want the output to do and for how long?

Title: Re: Urgent, HELP ME Please: How to amplify PIR sensor output voltage to 5Vand 12V?
Post by: l_e_a_88 on April 17, 2011, 08:47:42 AM

Hi Soeren,

can u show me either way? i would like to learn..thanks =)
mind to show me how the connection / schematic?


i would like to make it like this...
if PIR sense movement, then it will on supply voltage for another two circuit boards for the fan(12V) and light (5V),
until the person left (mean no movement sense) then the supply voltage will be cut off...fan and light will be off.
is it possible?

thanks...

Title: Re: Urgent, HELP ME Please: How to amplify PIR sensor output voltage to 5Vand 12V?
Post by: Soeren on April 17, 2011, 10:47:55 AM

Hi,

Quote from: l_e_a_88 on April 17, 2011, 08:47:42 AM

if PIR sense movement, then it will on supply voltage for another two circuit boards for the fan(12V) and light (5V),
until the person left (mean no movement sense) then the supply voltage will be cut off...fan and light will be off.
is it possible?

Anything is possible if you can imagine it.

To keep the light and fan on while a person is in the room, you'd need some delay, as the PIR only senses movement. If a person stands (or sits) still for even a second, there's no output from the PIR, so, without a delay, it would switch on and off repeatedly.

You didn't answer my question...

Quote

Is the 0.6V to 0.8V when it senses movement or at rest?

Is the PIR taken from something else, or is it a ready bought  "canned" unit?
Do you have a link to it or could you post a couple of photos (the connections in particular)?


It's impossible to device a circuit when you don't know the signals that's going to control it, so you need to answer the above..