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### Topic: RE200B PIR Component (Read 23707 times)previous topic - next topic

#### low5545

##### Aug 20, 2011, 12:48 pm
Can anyone help me to make a PIR sensor circuit according to the RE200B and a Fresnel Lens? Datasheet and pictures attached.

Datasheet: http://www.escol.com.my/Datasheets_specs/RE200B.pdf

arduino-freelancer.blogspot.com

#### Magician

#1
##### Aug 20, 2011, 06:54 pm
Connect D (pin 1) to +5V, S (pin 2) to 47 kOhm resistor to ground, and consequently G (pin 3 ) to ground GND.

#### Techone

#2
##### Aug 21, 2011, 02:33 am
@low5545

Just I post in the posting "op-amp", Connect + 5 to -->choose between 1 K to  4.7 K --> D, S ---> choose between 1 k to 4.7 K --> GND and G is GND.       Sorry Magician...       I looked at the datasheet, the sensor is a IR detector and a JFET for D & S, there for a commun source amplifier.

I forget, connect a 1 uF to 10 uf in // with resistor connect  to S to GND.  And you may amplify the signal using op-amp, you may "convert" the signal into TTL. The only way to make sure is to "see" what type of signal you have is to use a "scope" to check & see the signal.

My opinion.

#### Magician

#3
##### Aug 21, 2011, 04:03 am
Don't agree, read data sheet again.
1. For max.  source capability 2 mA, resistors 1k + 1k are way too low, allow 2.5 mA with 5V power.
2. Bias voltage of JFET 3.6 - 4.4 V leaving almost nothing for drain resistor, again with 5V.
3. JFET is a transconductance amplifier, should be wired as common drain :
http://en.wikipedia.org/wiki/Common_source
4. Capacitor doesn't make any sense at all, as it pure DC amplifier, thermo IR is too slow to react on freq.
F = ~ 1 / C x R = 1 / 10^-5 x 10^3 = 100 Hz.
5. The answer is in small font on picture posted - "100 k resistor between pin 2 and 3" (source to ground)

#### Techone

#4
##### Aug 21, 2011, 06:01 pm
@Magician

My mistake... I agree with you. Forget about the capacitor in this case. It look like the sensor work in "Level changing" , in that case... the signal will be connect to a comparator for a proper level signal ( 0 V or 5 V ) and connect to the Arduino.

#### Magician

#5
##### Aug 21, 2011, 08:39 pm
Yes, sure OP can use external comparator, but it easier to use analog input port, and implement "software comparator" which could be set to any value in range 0 - 1023. All it would take three pieces of wire and one resistor to attach sensor to arduino.

#### Techone

#6
##### Aug 22, 2011, 05:00 am
A "software comparator" like --->

if (analogRead( anyanalogpin) < 512 )
{ // do you thing }
else
{ // do other things  }

... that is a simple idea.. I may use that in my projects. Thank Magician...

#### low5545

#7
##### Aug 22, 2011, 01:16 pm
Quote
A "software comparator" like --->

if (analogRead( anyanalogpin) < 512 )
{ // do you thing }
else
{ // do other things  }

... that is a simple idea.. I may use that in my projects. Thank Magician...

Tried it. It maintains on 124-126. Too small to see a change. Is a Op-Amp IC like LM324 and a Comparator IC like LM339 able to amplify a compare the signal to produce a 5V/0V Output?
arduino-freelancer.blogspot.com

#### Techone

#8
##### Aug 23, 2011, 04:04 am
Quote
Is a Op-Amp IC like LM324 and a Comparator IC like LM339 able to amplify a compare the signal to produce a 5V/0V Output?

YES.  Bear in mind the LM324 need dual power supply. The LM339 do not use a dual power supply. It will work using a +5 V for the LM339.

#### low5545

#9
##### Aug 23, 2011, 03:42 pm
Quote
Insert Quote
Quote
Is a Op-Amp IC like LM324 and a Comparator IC like LM339 able to amplify a compare the signal to produce a 5V/0V Output?

YES.  Bear in mind the LM324 need dual power supply. The LM339 do not use a dual power supply. It will work using a +5 V for the LM339.

Dual power supply? What does it mean?
arduino-freelancer.blogspot.com

#### Techone

#10
##### Aug 23, 2011, 06:12 pm
It mean a plus side  - positive Rail.   A negative side - Negative Rail  and a commun rail.

----------------------------------    + 5   <-- goes to +V of the op-amp example : pin 7 of a LM741

-------------------------------------  GND  <-- the commun line for your signal and goes to GND of the Arduino

-----------------------------------  - 5   <--  goes to -V of the op-amp. example : pin 4 of a LM741

Here a site : http://www.play-hookey.com/analog/experiments/basic_op_amp_inverter.html
Just "surf" the site.

For what you need is a comparator. A LM339 only need a single supply ( +5 V is OK ) You simply set the voltage "tipping" point. A 50 K potentiometer to set the voltage treshold <-- Tipping point and reference point.  Connect to the - or + input The signal of the sensor goes to the + or - input.

I recomment you experiment so you have a better understanding.

http://www.play-hookey.com/analog/comparators.html

#### low5545

#11
##### Aug 24, 2011, 01:06 pm

How come dual power supply for the LM324? According to the internal circuit above, it is only Single.
arduino-freelancer.blogspot.com

#### Techone

#12
##### Aug 24, 2011, 06:44 pm
@low5545

In general, most op-amps need a dual voltage to operate ex: LM741. In the case of the LM324, It need a single voltage supply connect to pin 4 of the chip and GND at pin 11 of the chip.

My appology for confusing and mislead you.

A +5 V supply may work... ( you have to experiment to check if it is working )

#### low5545

#13
##### Aug 25, 2011, 11:10 am

According to the LM324 Op-amp above, if I want to amplify a signal, do I connect it like:

-pin 4 (V+) ------------- 5V
-pin 11 (GND) ---------- Ground
-pin 2 (-input 1) -------- Ground
-pin 3 (+input 1) ------- RE200B PIR Signal Output

-pin 1 (output 1) -------  Amplified signal

Is this connection able to amplify the signal made from the RE200B PIR component? I may need to amplify it a few times with this op-amp IC to get a bigger change.
arduino-freelancer.blogspot.com

#### Techone

#14
##### Aug 25, 2011, 05:15 pm
Quote
-pin 4 (V+) ------------- 5V
-pin 11 (GND) ---------- Ground
-pin 2 (-input 1) -------- Ground
-pin 3 (+input 1) ------- RE200B PIR Signal Output

-pin 1 (output 1) -------  Amplified signal

Is this connection able to amplify the signal made from the RE200B PIR component? I may need to amplify it a few times with this op-amp IC to get a bigger change.

Amplify signal in this connection ?  NO

The way you  connected is a comparator configuration.

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