hi everyone,
i am unable to upload anything on the site, the option no longer appears on the site. are you facing the same problem or i am doing something wrong?
hi nitish.
i think you want to ask about the IR sensors, so i will try to explain the working here
the transmitter (IR Tx) is connected in forward bias. hence i keeps on emitting IR radiations. the receivers (IR Rx) are connected in reverse bias. hence when no IR is present we get 5V across the sensors and 0 V across the resistance (ideally).
when ir falls on the receivers the conduct and hence the 5 V drops to a lower value (say by 1V). now this remaining 1V appears across the resistance and we get this voltage across the resistance as the output.
April 12, 2008 at 5:19 pm
hi everyone,
i am unable to upload anything on the site, the option no longer appears on the site. are you facing the same problem or i am doing something wrong?
July 9, 2008 at 3:04 pm
can u plz tell how the sensing mechanism works………
July 29, 2008 at 7:17 pm
hi nitish.
i think you want to ask about the IR sensors, so i will try to explain the working here
the transmitter (IR Tx) is connected in forward bias. hence i keeps on emitting IR radiations. the receivers (IR Rx) are connected in reverse bias. hence when no IR is present we get 5V across the sensors and 0 V across the resistance (ideally).
when ir falls on the receivers the conduct and hence the 5 V drops to a lower value (say by 1V). now this remaining 1V appears across the resistance and we get this voltage across the resistance as the output.
please refer to the circuit here…
http://graigroup.files.wordpress.com/2008/04/sensors2.pdf