Does anyone now where I can get a IR sensor for Arduino who's emmited wavelength goes to 1200 nm or higher? I've been searching for a while now, but haven't been able to find anything.
A sensor for IR remote control or what? Emission or reception?
You have to check which sensor provides the desired sensitivity on its spectral curve. Check the diagrams of photo diodes/transistors and LDRs.
LEDs respond as photodiodes to wavelengths peaking typically 50 nm shorter than the emission wavelength.
https://www.thorlabs.com/thorproduct.cfm?partnumber=LED1200L
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