Get the SoR Robotics Android App on Android Market for FREE. See this forum post for details.
0 Members and 1 Guest are viewing this topic.
[...] they aren't working right. they seem to have a continuos high output, even when there is no ir light pointing at it.
could the problem be that i am not using coded data? it's what the datasheet recomends. also, could you tell me a good ir reciever that i can use for object detection?
Those IR receivers are tuned to a fairly narrow modulation frequency (check DS for spec). If the IR LED pulse frequency is not almost exact then the receiver will not detect the LED. Since you are using a 555 to create the LED pulses have you measured the frequency?
to answer the questions above,the led is 940NM wavelength,
distance is <20cm and the receivers have a range accurate of 20cm,
the application is reflective for object avoiding/following,i can't show a picture of the schematic, but this may clear it up a bit, +6 0Ir receiver-\/-----------\ 36kHz 555 circuit-ir led / \ out-Voltmeter-/
The voltmeter is always at 6v, even if the led is directly pointing at it. the Ir receiver has a center frequency of 36kHz, so it probably won't work with a TV remote.
ok, i used a resistor in between the 6v supply and ir reciever during the test. the reciever can handle up to 6.3v, so thats not a problem.