Easy ways to reduce electronic "Noise" 38kHZ - Electronic Circuits Projects Diagrams Free

**Krumlink** · 2nd April 2008, 02:12 AM

I built a little IR detector, but it recieves a lot of interference/noise. I was wondering what are some simple tips to reduce it to a very small amount, aka no false detections. Since it detects a 38kHZ Input, It works around 38kHZ. I know adding caps, etc but any beter tips?

blueroomelectronics · 2nd April 2008, 02:26 AM

You can't without a microcontroller of some sort. Commercial IR decoders like the one the Junebug uses still sees IR noise, you simply decode the information you want and throw away the rest.

audioguru · 2nd April 2008, 02:54 AM

The TSOP series of IR receiver ICs use automatic-gain-control when they see continuous 38kHz IR like from compact fluorescent light bulbs and also DC. When they see data in bursts and gaps then the gain goes up to max.

**Krumlink** · 2nd April 2008, 03:01 AM

I guess what I mean is how to eliminate false detection spikes

blueroomelectronics · 2nd April 2008, 03:05 AM

A one-shot could do that.

**Krumlink** · 2nd April 2008, 03:08 AM

Meh I will just add a bunch of caps, tants electrolyic, etc.

audioguru · 2nd April 2008, 03:09 AM

Post your circuit for us to show you where the noise or "false detection spikes" are coming from.

**Krumlink** · 2nd April 2008, 03:16 AM

aw now I have to make one

It is the "roundabout" robot from www.robotroom.com circuit

Guess you gotta get the book

jpanhalt · 2nd April 2008, 03:42 AM

Hi Krumlink,

This works and does noise correction with a 12F series PIC. Here is a link to the original article on which it is based:

http://users.frii.com/dlc/robotics/projects/botproj.htm

Scroll to the 12C508 project. There are also useful links therein to the Dallas group.

The best part of the project is the error correction concept. The code is for a 12C/F series PIC, but is easily adapted to other versions. The schematic and code are attached. It was for a specific purpose that I had, but can be easily adapted to other uses.

The application has been outdoors in bright sunlight and and has worked flawlessly.
John

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2nd April 2008, 02:12 AM	(permalink)
Krumlink	Easy ways to reduce electronic "Noise" 38kHZ I built a little IR detector, but it recieves a lot of interference/noise. I was wondering what are some simple tips to reduce it to a very small amount, aka no false detections. Since it detects a 38kHZ Input, It works around 38kHZ. I know adding caps, etc but any beter tips? __________________ MechTronics World of Warcraft is a disease

2nd April 2008, 02:26 AM	(permalink)
blueroomelectronics	You can't without a microcontroller of some sort. Commercial IR decoders like the one the Junebug uses still sees IR noise, you simply decode the information you want and throw away the rest. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

2nd April 2008, 03:01 AM	(permalink)
Krumlink	I guess what I mean is how to eliminate false detection spikes __________________ MechTronics World of Warcraft is a disease

2nd April 2008, 03:05 AM	(permalink)
blueroomelectronics	A one-shot could do that. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

2nd April 2008, 03:08 AM	(permalink)
Krumlink	Meh I will just add a bunch of caps, tants electrolyic, etc. __________________ MechTronics World of Warcraft is a disease

2nd April 2008, 03:09 AM	(permalink)
audioguru	Post your circuit for us to show you where the noise or "false detection spikes" are coming from. __________________ Uncle $crooge

2nd April 2008, 03:16 AM	(permalink)
Krumlink	aw now I have to make one It is the "roundabout" robot from www.robotroom.com circuit Guess you gotta get the book __________________ MechTronics World of Warcraft is a disease