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Recent content by Iuri

  1. I

    Passive High Pass Filter Through a Differential Input

    I know about Nyquist Theorem, but this is the first time I design something like that, so I don't have experience at all in anti-aliasing filter. Should I use a higher order passive LPF or a active one? Thank you.
  2. I

    Passive High Pass Filter Through a Differential Input

    The sample frequency will be 1000 samples/s. The low pass cutoff frequency is about 200hz. I was concerned if 1st order is enough. Any suggestions? Thank you!
  3. I

    Passive High Pass Filter Through a Differential Input

    LvW, I was thinking in a passive low pass as next stage and then connect to my differential ADC. I didn't notice that. What do you suggest me?
  4. I

    Passive High Pass Filter Through a Differential Input

    So, should I use C1=C2=C*2 to achieve my cutoff frequency?
  5. I

    Passive High Pass Filter Through a Differential Input

    This picture attached is a high pass configuration, the R2 was referred for low pass one. You answered my doubt, I should use C1=C2=C/2. Thank you!
  6. I

    Passive High Pass Filter Through a Differential Input

    I have a doubt about passive filters in differential inputs. In low pass configuration I found this thread (https://www.edaboard.com/threads/176766/) that tells me to use the RC constant as: R = R1 + R2 C = C1 But, if I want a high pass do I need to use the same idea or something like this: R...
  7. I

    Help me choose a USB firmware for my system

    Re: USB firmware question Well, if my calculations are right this bandwidth is enough. 24 channels * 24 bits * 5000 samples/s = 2880000 bits/s or 360000 bytes/s Now I need to write and test the firmware and see the results. Thank you!
  8. I

    Help me choose a USB firmware for my system

    Re: USB firmware question I'm not familiar with Ethernet development.. Full-speed USB seems to me that can do the job. I'll look about WinUSB. Thank you!
  9. I

    Help me choose a USB firmware for my system

    I'm building a system that will get samples from external ADC (SPI) and send to my computer through USB interface, basically a monitoring system. The final system will consist in 24 channels, each one with 24 bit resolution and sampling rate of 5kHz. Given this requirements, serial emulation...
  10. I

    Theoretical basis for Resistance Measurement with a microcontroller

    Yes, i'm using the PIC 18F2550.
  11. I

    Theoretical basis for Resistance Measurement with a microcontroller

    I'm thinking in build a Resistance Meter using a microcontroller, but dont know exactly how to do this. My requirements at beginning: 0 ~ 10Mohms Searching around, I've found an Microchip application note that describles a construction of a R meter, but the range is too low (0~999ohms) for my...
  12. I

    ICD2 and PIC18F2550 issue

    Good news guys, i pluged the Vdd from ICD2 with Vcc from my power supply and everything worked out! Now i gonna design a development board for pic18F2550 so I can get deeper and better in the pic programming world Thank you for your time! Iuri~
  13. I

    ICD2 and PIC18F2550 issue

    if you mean "Build All", yes. ---------- Post added at 02:19 ---------- Previous post was at 02:15 ---------- I moved to another computer with Windows XP, the the last one was Seven 64 bits, and remade some connections on breadboard and it works ( also in ICD2 supply )! I'll teste with...
  14. I

    ICD2 and PIC18F2550 issue

    I restarted the computer and checked the breadboard connections and works again ( with ICD2 supply ). At this moment I'm using the internal oscilator as MCLK and Programmer mode is woking good with ICD2 supply, will try it out later BigDog. I need to set the Debug mode up first! Yes, already...
  15. I

    ICD2 and PIC18F2550 issue

    PBADEN = OFF already done.. thanks for the tips! I build the regulator ( 7805 ) and now I got this error when I try to connect the programmer and this if I try to program
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