no ir on new module
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Hi I brought a new ir height sensor from e3d. I tested it using my camera and I can't see the leds light up.
The module boots up normally i.e. four red led flashes and triggers when i put my hand under it. -
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@ageis said in no ir on new module:
Hi I brought a new ir height sensor from e3d. I tested it using my camera and I can't see the leds light up.
The module boots up normally i.e. four red led flashes and triggers when i put my hand under it.Which means that your camera can't see the Infra Red light - it does not mean that IR light is not present. IR light covers a spectrum some 10 times broader than visible light. Glass lenses block the middle and lower part of the IR spectrum longer than about 2.2 microns. Those wavelengths won't even make it through the lens to the sensor. Many visible light cameras have a filter that blocks IR - not just the longer wavelengths but the sorter ones too. If your camera does not have a filter, then you might be able to detect near infra red (the part of the spectrum closest to visible light) but it's unlikely that your module would use near infra red as it would be prone to interference from the visible light part of the spectrum.
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@deckingman said in no ir on new module:
Infra Red light - it does not mean that IR light is not present. IR light co
I tried my camera using a remote control, I could see it. So my camera can see ir.
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@ageis deckingmans point was that IR is a broad spectrum. "Typically, it is taken to extend from the nominal red edge of the visible spectrum at 700 nanometers (nm) to 1 millimeter (mm). This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz." (wikipedia)
So the IR of your remote may be something the mobile camera still catches, but the IR of the probe may be outside the spectrum the camera captures.
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@ageis What we know. 1 The device is working perfectly. 2 The device has an IR emitter and an IR detector. So if there is no IR present as you claim, then what is triggering the detector such that the device works perfectly?
Let's put it another way. You say the visible LEDs flash as they should do. So take a multimeter, set it it read 240V AC and check the voltage across an LED. I'm willing to bet that your multimeter won't show the voltage because it will be a low single digit DC value. According to your "logic" the LEDs work perfectly but there is no voltage present. Of course there is, but you've set your meter to read a part of the voltage range that cannot detect the small DC voltage. The same applies to IR. Your camera might be able to detect a small part of the IR spectrum but that doesn't mean there is no IR being emitted at other parts of the spectrum.
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@ageis bear in mind that the IR LEDs that we use in the sensor are quite highly focussed, unlike the IR LEDs in remote controls. So you will to have your camera in line with the beam to see them.
