Just built my first prototype out of sticky tape, coathangers and thread.
Wow.
Works like a charm.
Of note, if you do go for the SFH485P 80 degree IR LEDs, they're often quoted with 3v forward voltage .... not so. Like the majority they only drop 1.5v. (melted a resistor due to that
).
Also could not for the life of me get any kind IR filter from photograpic film (exposed and non exposed developed film) but breaking open a floppy disk solved that problem.
Thank you for this kestrel7e7, it's awsome.