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Now how high is the inductor current? There is AC current (often measured in RMS) this can be calculated with frequency and inductance.
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So if the average current through the coil is just a bit higher than the 10mA then the capacitor voltage will rise to the maximum. In best case - at almost zero duty cycle - the LED is able to drop the capacitor voltage by 1.5mV each cycle. The capacitor gets charged (30kHz) and discharged (by the LED). (hopefully my mind calculation is correct. Now you have: C, I, t thus you can calculate V The basic capacitor formula is: C = I * t / V Your switching frequency is about 30kHz (30us) Especially for one with not deep experience they are very helpful to play around with different part values. Maybe even find one with 100 mA type output capability.Or sue a power opamp Where no fdbk to the Arduino would be needed and latency very short. Lastly of course an I2C DAC with output buffer would easily produce accurate values
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Standard technique used in PLLs to reduce acquisition time.
Arduino analogwrite full#
Once that C charges the diodes turn off appling the full RC That way when large steps occur in PWMĭuty cycle the diodes conduct and rapidly charge the high valued C in that section, With low RC time constant, followed by a second section with high RC time constant,Īnd strap diodes across the R in that section. For example split filter into two sections, one initial LPF With respect to the latency problem in post #7 you could play with a non linearįilter in lieu of the RC LPF. As the methods can be accessed through the Robot object directly, you don't need to call the constructor.Note in your diagram your MOSFET symbol seems to have Source and DrainĬonnections reversed.
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RobotControl Class RobotControl Description You can find examples for this library in the Examples from Libraries page. Use it to make your own custom version of the Motor Board firmware