I'm currently building a spindle tachometer for my CNC milling machine so that there is feedback back into the computer of the spindle speed.
Since there is no real way of putting an encoding disc on the shaft, I would like to use reflective paint on the shaft, which reflects light from an IR LED back to a photo transistor.
My question is, what sort of circuit would you recommend for this?
I have plenty of Op Amps such as the LM393 and 741 but finding any good examples of people doing the same thing has been quite limited.
Any suggestions?
Since there is no real way of putting an encoding disc on the shaft, I would like to use reflective paint on the shaft, which reflects light from an IR LED back to a photo transistor.
My question is, what sort of circuit would you recommend for this?
I have plenty of Op Amps such as the LM393 and 741 but finding any good examples of people doing the same thing has been quite limited.
Any suggestions?
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