Comment summary #43
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Comment 421 ... 430
| date | article | author | comment |
| 02 dec 2014 19:21:07 | Magnetic permeability | Mohammad | yes I understand that, but in the example above you gave measurement of Lc as 92,9*10e-3 and N= 49, but you did not give the value of Ac in that particular example. Secondly,I assumed value for Ac, Used it to find H and used the measurements that you offered above to rebuild the curve in mat lab and I tried to plot B-H curve which is as a result of the non-linearity of u will saturate but I did not get saturation. can you tell me why? and can you tell me what value of Ac you used to plot the curve of Hdc-Ur above. why do we have to use log-log plot? thanks |
| 02 dec 2014 12:40:23 | Magnetic permeability | Freddy | Ac is the cross sectional area. The introduction of this article refers to Magnetic circuits where the physical dimensions are explained. |
| 02 dec 2014 07:34:29 | Magnetic permeability | Mohammad | Please can you tell me what is the value of Ac it is not written above. |
| 29 nov 2014 13:19:27 | Average & effective values | Freddy | It is the RMS value that equal to the DC-value. |
| 28 nov 2014 15:54:17 | Average & effective values | Dravigon | Can u say wether rms or average value of a.c is its d.c equivalent voltage for sine and half wave rectified sine waves |
| 19 nov 2014 13:55:14 | Arduino: Analog measurements | Freddy | You can use any analog input you want. The choosen channel must be set in ADMUX, see the datasheet what the value must be. Serial.print command should always placed in void loop(), never in ISR(ADC_vect). Yes, in the ISR(ADC_vect) you can store the values in an array. |
| 18 nov 2014 23:53:46 | Arduino: Analog measurements | Mohamed Ali | I am trying to control a servo while getting continuous analog measurements, so your article is golden for me! However, I have several questions, from code 2, I have copy pasted this code in arduino, and I filled my void loop() with controls over the servo. Now what analog pin should I use for the analog to digital conversion? and where in the code should I specify that? Also if I wanna be able to read my analog readings, where should I put a Serial.print(aval) statment?Can I save those values in an array? Thank you, please consider that I am brand new at this and any help would be greatly apprecitated |
| 28 okt 2014 14:44:59 | Arduino: Analog measurements | Freddy | It's a logic deduction. Every AD-converter uses a process (unless it is a very expensive flash converter) that takes time (clock cycles) to get the result. And because the function analogRead() returns the result that can be used in the subsequent code, there is no other way than waiting till the result is present. This applies to every controller and type of code unless the result is processed by a separate interrupt routine called by the ADC when it is ready. |
| 28 okt 2014 00:40:31 | Arduino: Analog measurements | Ayomi | Thank you for the reply. I would like to ask you one more question. How did you come to the conclusion that using analogRead() would hold Arduino from executing other code while waiting for the conversion result? And is that applied to the ATmega328 controllers only? |
| 23 okt 2014 12:29:47 | Arduino: Analog measurements | Freddy | The 13 clock cyles for a single conversion is fixed and can't be changed. See the ATMEGA328 datasheet chapter 24, figure 24-5, 24-6 and 24-7. And see also the related description of the microcontrollers AD-converter. |