Pages: [1]   Go Down
Author Topic: IR sensor circuit problem  (Read 2220 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 6
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset



I would like to do a IR reflective sensor so I constructed this circuit......Why does the circuit no function at all???
What's wrong of this circuit???
Logged

Manchester (England England)
Online Online
Brattain Member
*****
Karma: 627
Posts: 34252
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
.Why does the circuit no function at all???
Lots of possible reasons:-
1) Because you have not wired it up correctly.
2) Because you have the IR source too far away, try it at a distance of less than 10mm
3) Because you are not blocking it with something opaque to IR.
4) You have not specified what sensor that it, you have just drawn it as a transistor.
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17294
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Also maybe the IR diode and the photo-transistor aren't designed to use the same wavelength frequency?

Lefty
Logged

the land of sun+snow
Offline Offline
Faraday Member
**
Karma: 159
Posts: 2916
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Are D and Q in one package?
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 6
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

http://www.cytron.com.my/viewProduct.php?pcode=SN-IRS-02&name=IR%20Sensor%20Set%20With%20Socket
the sensor is one set......and I am sure no problem with my circuit
Logged

Manchester (England England)
Online Online
Brattain Member
*****
Karma: 627
Posts: 34252
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Just given the circuit diagram then nether do we.
What you need to do is to post a photograph of how you have wired it up along with the code you are running.
Logged

the land of sun+snow
Offline Offline
Faraday Member
**
Karma: 159
Posts: 2916
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

If it's not working, it's about 90% probability you have the thing wired wrong. The other
10% is they sold you a bad part.

Also, note, as G_M indicated in his first post, those small packages sense properly over only
a very short range, a couple of mm. The data sheet will say.

Now, the larger devices will sense over a much longer range, but the following one probably
has pickup to the side directly from the Led. Usually there is a light baffle in between Led
and pickup device.

http://www.cytron.com.my/viewProduct.php?pcode=SN-IRS-01
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 6
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

This is my pcb design.......


* sensor.JPG (10.39 KB, 532x319 - viewed 97 times.)
Logged

Right Here!
Offline Offline
Jr. Member
**
Karma: 0
Posts: 66
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

You've shown the receiver as being a diode, but the spec sheet says it's a transistor! Is the Collector connected to +5V?

Does the output stay at zero (I'm rather expecting it does) so increase R2 to something like 1M

If it stays at or near 5V, then either it is surprisingly responsive and picking up stray IR, or you've damaged it.

What are you using as a reflector?
« Last Edit: December 15, 2012, 06:34:13 pm by Folderol » Logged

Manchester (England England)
Online Online
Brattain Member
*****
Karma: 627
Posts: 34252
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

This is my pcb design.......
No it is not, it is a schematic. It is a different schematic than you said you were using in the first post.
I asked:-
Quote
What you need to do is to post a photograph of how you have wired it up along with the code you are running.

If you are going to keep changing your story and refusing to cooperate with requests you won't win many friends here.
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

This product is for 3v,
Your sketch indicate 5v....

http://www.cytron.com.my/viewProduct.php?pcode=SN-IRS-01&name=IR%20Sensor%20Set

Good luck!
Logged

Pages: [1]   Go Up
Jump to: