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 1 Topics / Robotics / Arduino Simulink on: April 25, 2014, 10:49:31 am Hi guys,I would like to ask you very kindly how I can communicate arduino and simulink on Matlab R2009b, because there is a lot of information for another matlab versions from R2012a. I just want to blink a LED by the moment but using simulink blocks.Can someone help me please?Thank you in advance for your response.
 2 Topics / Robotics / RC Circuit and square wave on: April 07, 2014, 11:49:37 am I would like to ask you, how does the capacitor current graph looks, if I apply a square wave signal(from 0 to 5Volts) into a RC circuit?,let's consider a duty cycle of 50%?.Thanks in advance for you response.
 3 Topics / Science and Measurement / Re: A/D converter on: April 02, 2014, 04:57:49 am ??? what do you mean Jantje?    I am trying to read a pot but I want to understand A/D conversion first. My next step is to study electronics in the future, but many people told me that using arduino I'm just wasting my time and I have to learn embedded C language to work with PIC or AVR microcontrollers.btw thanks for your opinion
 4 Topics / Science and Measurement / Re: A/D converter on: April 02, 2014, 03:59:51 am Ok guys, thanks a lot for your answers ... but I think you didn't give a quite clear answer .... I am trying to do a project for my secondary school and I dont really understand what you wrote! ..... Could you response to this please :Hello,I would like to ask you very kindly about 10bit arduino converter. If I am using 2V as reference voltage then to calculate its resolution I can apply the following formula Vref/(2^N-1) or Vref/(2^N) ??? which one is correct??? . Moreover, If the converter give 512, to calculate the corresponding voltage value I can use this formula 512*(Vref/1023) and if it is giving 256 then 256*(Vref/1023) and so on ???? in other words is it correct to use 1023 or 1024 for 10 bit converter???Thank you in advance for your response.
 5 Topics / Robotics / A/D Arduino converter on: April 02, 2014, 02:31:29 am Hello,I would like to ask you very kindly about 10bit arduino converter. If I am using 2V as reference voltage then to calculate its resolution I can apply the following formula Vref/(2^N-1) or Vref/(2^N) ??? which one is correct??? . Moreover, If the converter give 512, to calculate the corresponding voltage value I can use this formula 512*(Vref/1023) and if it is giving 256 then 256*(Vref/1023) and so on ???? in other words is it correct to use 1023 or 1024 for 10 bit converter???Thank you in advance for your response.
 6 Topics / Science and Measurement / A/D converter on: April 01, 2014, 07:00:05 am I would like to ask you very kindly How can I correctly calculate the resolution for a A/D converter (10bits) ? Why many people is using the following formula Vref/1024  and other Vref/(1024-1)  ???? This is very confusing !Thank you in advance for a suitable response.
 7 Topics / Robotics / Re: How to eliminate the offset of a signal on: June 28, 2013, 02:06:19 pm Hello,I have tried capacitors but, it is not working. I dont really understand why! I have used 1uF and10uF electrolitic capacitors, but it is not solving the problem, the signal is still oscillating around 1.4volts.Could you explain why the condensator is not solving that problem? . I have connected the signal to the capacitor positive leg and the other to the ground? is it correct ? or how should I connect the capacitor???Thank you in advance for your response.Best regards.
 8 Topics / Robotics / How to eliminate the offset of a signal on: June 26, 2013, 09:47:55 am Hello,I would like to ask you very kindly how I can eliminate the offset of a signal. My signal is oscillating around 1.4 volts so the maximal displacement of my signal is 1.45 volts and the minimal 1.35volts. I need that signal oscillating around zero so maximal displacement 0.05 volts and minimal -0.05. In other words +/- 0.05 volts. How Can I do that ? Could you help me with this problem please?. Thank you in advance for your response.Have a nice day.
 9 Topics / Robotics / op-amp:Gain Tunning Problem on: June 14, 2013, 12:04:47 pm Hello,I would like to ask you very kindly the following question:I'm trying to make an active low pass filter, It consists of 3 parts. First one is to develop a bipolar symmetric source in order to connect a op-amp ua741, the second is to implement an active low pass filter using that op-amp. Up to this point everything is going well. But when I connect the second op-amp and put the suitable resistors. So there is starting a problem with the bipolar symmetric source, which is not symmetric anymore. So, I get more negative voltage than positive and I don't know why? Can somebody explain me why?Thank you in advance for your response.Best regards
 10 Topics / Robotics / Reading analog input using Arduino Motor Shield on: April 10, 2013, 11:39:50 am Hi there!I would like to ask you if it is possible to read an analog input using arduino motor shield while a DC motor is going forward and backward. I have a big problem when I'm trying to do this because a delay of 90ms is necessary in order to move the DC motor and I need to sense an analog input with a sampling time of Ts=0.01s. Could you advice me please?Thank you!
 11 Topics / Robotics / Re: How to read +/- 4 volts using Arduino on: March 22, 2013, 09:05:07 am Thanks Pito !.
 12 Topics / Robotics / How to read +/- 4 volts using Arduino on: March 20, 2013, 12:25:18 pm Hello:I want to ask you if it is possible to read a voltage signal +/- 4 volts using Arduino. It is a sinus signal, which is going from +4volts to -4volts and vice versa.Could you explain me how to do that step by step.Thank you very much for your help.
 13 Topics / Robotics / Re: How to change 5 DC volts from Arduino into +/- 5 volts on: February 09, 2013, 11:08:51 am Hi my friend:what do you mean by negative pin ? is it GND ? , I have tried tuning a negative value for analogWrite --- PWM pin 9; but it just can send a maximum voltage around 4.96 volts. In other words, It is not possible to get a negative voltage directly from arduino. I think it is necessary to design an external circuit to obtain that value. But I have no idea about how to do it.Waiting for responses thanks for your help
 14 Topics / Robotics / Re: How to change 5 DC volts from Arduino into +/- 5 volts on: February 09, 2013, 09:39:25 am Hello my friend:So the waveform can be for example v=5sin(2*pi*frequency), frequency=3Hz.Using arduino is I think impossible to get an oscillating voltage between +/- 5 volts. Because the  arduino output voltage is from 0 to 5 volts.Any data acquisition card has that possibility but is veeery expensive. I can't pay that How can I resolve my problem using arduino?or there is not solution?thank you for your help my friend.
 15 Topics / Robotics / Re: How to change 5 DC volts from Arduino into +/- 5 volts on: February 09, 2013, 09:09:00 am Thank you for your response. So, the problem I have is as follows.I have an input voltage, for example 5 DCV, which will be applied for 2 minutes. So I would like to obtain an output voltage oscillating between -5 and +5 volts. How can I get that ? is it possible ?I have no experience with electronics, but I need to do that for my school project.Thank you.
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