Peter_wadley
New Member
Question 1: Does the torque of stepper motors (Bi-Polar) increase when switch to half step mode?
Question 2: I have a phototransistor that I would like to use for a back door alarm system.. when the door is opened a beam of IR light, which is other wise always on the phototransistor, is broken.. resulting in a siren buzzer to trip. I want either sheild the phototransistor from all non-IR light... any suggestions? are there any premade IR recievers out there I can use?
Why are most IR recievers tagged with XXkhz ? Can these take a solid beam of IR or does the light need to be in pulses?
Question 3: What do you guys think about the unbelievable shooting at Virginia Tech? It was in an engineering complex.
Question 2: I have a phototransistor that I would like to use for a back door alarm system.. when the door is opened a beam of IR light, which is other wise always on the phototransistor, is broken.. resulting in a siren buzzer to trip. I want either sheild the phototransistor from all non-IR light... any suggestions? are there any premade IR recievers out there I can use?
Why are most IR recievers tagged with XXkhz ? Can these take a solid beam of IR or does the light need to be in pulses?
Question 3: What do you guys think about the unbelievable shooting at Virginia Tech? It was in an engineering complex.