ibeanjacob
Newbie level 4
Computer mouse sensor
Has anyone used the sensors from those common mechanical computer mouse.What kind of sensor is it?
Is it a plain phototransistor or some chip.
It has three pins.In the mouse board centre pin is connected to positive supply and the other two pins are connected directly to the mouse chip.
I tested it outside by connecting centre pin to 5v.
It gave almost 0v in both the other pins.Then I shone an ir led directly at it and it gave almost full 5v on both the other pins.This voltage reduced propotionally as I reduced the intensity of the ir led.
How come this happens without any other biasing being provided ?
Has anyone used the sensors from those common mechanical computer mouse.What kind of sensor is it?
Is it a plain phototransistor or some chip.
It has three pins.In the mouse board centre pin is connected to positive supply and the other two pins are connected directly to the mouse chip.
I tested it outside by connecting centre pin to 5v.
It gave almost 0v in both the other pins.Then I shone an ir led directly at it and it gave almost full 5v on both the other pins.This voltage reduced propotionally as I reduced the intensity of the ir led.
How come this happens without any other biasing being provided ?