Hello everyone,
Got a simple question about a phototransistor I bought in a local shop. I plugged an infrared emitting LED on one pin of a uC and it does flashes fine on a 1 second interval. The phototransistor is pointing completely in the other direction about 1 inch of the LED. The problem is: I don't have ANY info on the phototransistor else than
a) It's a phototransistor
b) It's the golden one type with two pins
c) It's written 5mm on the description, which should be the diameter of the opening for receiving light.
I've connected what I think is the collector (flat pin on the frame) to a 2.2M (after many tries) and the emitter to ground to get what I think are the best value high/low values for now. I get something like 2.35V and 1.15V on a 5V supply. That is not enough to make any difference on a hex schmitt inverter (always low). Is there a way to improve the on/off voltage so it's more sensitive are it is normal behavior of a phototransistor and I must get a comparator to get that mighty 5V/0V back in my uC?
Got a simple question about a phototransistor I bought in a local shop. I plugged an infrared emitting LED on one pin of a uC and it does flashes fine on a 1 second interval. The phototransistor is pointing completely in the other direction about 1 inch of the LED. The problem is: I don't have ANY info on the phototransistor else than
a) It's a phototransistor
b) It's the golden one type with two pins
c) It's written 5mm on the description, which should be the diameter of the opening for receiving light.
I've connected what I think is the collector (flat pin on the frame) to a 2.2M (after many tries) and the emitter to ground to get what I think are the best value high/low values for now. I get something like 2.35V and 1.15V on a 5V supply. That is not enough to make any difference on a hex schmitt inverter (always low). Is there a way to improve the on/off voltage so it's more sensitive are it is normal behavior of a phototransistor and I must get a comparator to get that mighty 5V/0V back in my uC?