I want to create a very simple dark sensor. Browsing through many schematics I find all I might need is some resistors, LEDs and transistors and a key component called a photodiode. So my questions are:
Can I use an infared detecting led in replace of a photo diode?
Secondly, would a phototransistor or a Light Dependent Resistor perform the same function as a photodiode?
And finally are photodiodes or LDRs measured in ohms?
The attached schematic is what I would like to do.
Can I use an infared detecting led in replace of a photo diode?
Secondly, would a phototransistor or a Light Dependent Resistor perform the same function as a photodiode?
And finally are photodiodes or LDRs measured in ohms?
The attached schematic is what I would like to do.