Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: L3mon0s on October 18, 2012, 12:04:20 AM

Title: Help with Long Range IR Noise
Post by: L3mon0s on October 18, 2012, 12:04:20 AM

Hi guys,

I am in the process of building a track robot with the capability of using the SHARP89 2Y0A700 IR. I have begun testing the IR but have been getting back very noisy results. My question for you is how to reduce the noise produced from lights, sunlight etc.

I have heard about using a sort of tubing for the receiver and transmitters as well as some sort of RC filter.

Thank you for your help and sorry if this question has been asked in the past.

Title: Re: Help with Long Range IR Noise
Post by: Soeren on October 19, 2012, 06:02:35 PM

Hi,

You need to mount a capacitor directly over the supply terminal of the sensor.
The average LED current is 30mA (typ), but it's drawn as pulses of 200mA or more, so use from 47µF to 470µF (depending on what voltage loss your app. can tolerate), to buffer those high current pulses and don't skimp on the gauge of the ground wire.