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Electronics => Electronics => Topic started by: karmax on January 24, 2009, 12:02:46 PM

Title: tsop sensor
Post by: karmax on January 24, 2009, 12:02:46 PM

(http://www.triindia.co.in/resources_images/CircuitPool/TSOP%20based%20obstacle.jpg)i am using tsop sensor by this circuit but output is always 4 tp 5 v.can any body tell me wht should be the output

Title: Re: tsop sensor
Post by: Soeren on January 24, 2009, 12:44:22 PM

Hi,

Quote from: karmax on January 24, 2009, 12:02:46 PM

[...] output is always 4 tp 5 v.can any body tell me wht should be the output

Does the LED light when modulated light hits the sensor? Output should be low when it does.
A 4k7 resistor for R3 might help.

As a first test, put the front of your TV-remote a short distance (like a few inches) from the TSOP (the side with the round mould) and press eg. Vol Up (as it is a repeating key). That should get your output down.

Title: Re: tsop sensor
Post by: izua on January 24, 2009, 04:49:19 PM

It's normal for the output to be high, TSOP sensors work in negative logic (1 is off, 0 is on).