SparkFun Forums

[adamatronix]

I wont be needing the leds to emit light. I just want to use the phototransistors to detect a tap or touch using an object. A mechanical arm will come down to tap the transistor or 'cover' it.

Been busy. Will try to wire a single phototransistor this weekend to test. Will let you guys know if I have any questions.

[Valen]

Then why bother with these? Surely there are also true (IR) phototransistors without the led element.

[adamatronix]

Sure, any recommendations? I think I just searched sparkfun not knowing exactly what I needed. This particular model comes up.

[Valen]

Well, not any in particular. I don't have a partnumber-fetish. Search google for a local electronics shop. Or search other webshops for IR-phototransistor. There are some that look like regular leds with clear white plastic shell. Some have a rectangular body with a focusing lens on the side. Others have a pinkish color. Since you intend to rely on ambient IR brightness levels I have no idea what wavelength or sensitivity parameters you need to search for. But if infrared isn't a hard requirement then a simple (visible) light sensitive resistor (LDR) might also work for you purpose:

something like
https://www.sparkfun.com/products/9088