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Re: input resistance
Also a high impedance input is helpfull in linear OP AMP circuits. If the impedance input is not high enough some simple formulation could not be applied. For example, inverted amplifier A=-R2/R1 or not inverted amplier A=(1+R2/R1).
Re: Help!!!
Usually, FIR systems are more robust than IIR systems. IIR systems could become unstable. Please refer to:
Digital Signal Processing: Principles, Algorithms and Applications (3rd Edition)
by John G. Proakis, Dimitris Manolakis
You could try an Inverse-based controller design.
Please refer the book:
Multivariable Feedback Control
S. Skogestad., I. Postlethwaite.
John Wiley & Sons, Baffins Lane, Chichester, 1996
I think that any of the proposed solution defines a nonlinear system. In my experience I recomend you the first posibility ( heater or fan, but not at the same time).
The tuning process is not easy, due to the fact that the system is not linear. In my opinion it should be empirical or...
I think your might have problems with motor axis static friction. You could try to compensate it. The following book could be helpful for you:
Adaptive Control of Systems with Actuator and Sensor Nonlinearities.
G. Tao, P. Kokotovic.
John Wiley & Sons, Inc. 1996
Re: Q of a filter
There are some tables in this material that coud be useful for you.
Also your could try the following book:
Filter Handbook. A practical design guide
Stefan Niewiadomsk
i
You must be very carefull. Your need a step down transformer (a 220VAC/5VAC), but also you need to avoid any negative voltage in your ADC input.
Please refer to:
Measurement Systems: Application and Design
Ernest Doebelin
Definition: A soft real-time system is one in which performance is degraded
but not destroyed by failure to meet response-time constraints.
Definition: A hard real-time system is one in which failure to meet a single
deadline may lead to complete and catastrophic system failure.
nagoor kani control systems
In my opinion, Ogata is the best. However Schaum's is very useful for practical problems.
Schaum's Outline of Feedback and Control Systems
Allen J. Stubberud, Ivan J. Williams, Joseph J. DiStefano
it is accesible in
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