What am I doing wrong ??? Arduino - tachometer !? Answered
Hello ... I would like to ask, what am I doing wrong. I'm trying to create this instructable www.instructables.com/id/Arduino-Based-Optical-Tachometer/ ...
I downloaded the code, created the circuit (photo provided) ... and I'm using these components :
1. IR LED = SFH487-3 www.maplin.co.uk/module.aspx (code CY88)
2. Phototransistor = SFH300-3 www.maplin.co.uk/module.aspx (code NP64)
Resistors are the same value, like in the instructable.
Please, could you tell me, what am I doing wrong ???
Thank you very much.
P.S. : IR LED is working, the PhotoTransistor is working as well <- I tried to measure it with my voltmeter - for CONTINUITY ... and as I was getting closer to the IR light, the value was decreasing.