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Recent content by cleo claudiu

  1. C

    Chebyshev High Pass Filter

    HI guys, I am trying to implement a HPF Chebyshev. This may be a stupid question, but I dont know how to calculate f0 at -3 dB. apass=1dB astop=30dB fpass=15kHz fstop=8kHz ripple=1dB I don;t have Matlab in order to compute it there.
  2. C

    ST L3G4200D Gyroscope not working

    Thanks shaiko, I was following that datasheet, but still it didn't worked. But from yesterday I managed to fix the problem. and big surprise, the problem was that I connected wrong the cable to the Gyro...it's so f....g bad when that happens. Now it's working. the only problem now is that with...
  3. C

    FPGA Oktokopter implementation

    Hmmm, indeed , verry good point, thanks, i am gonna consult with him and make a decision soon.
  4. C

    FPGA Oktokopter implementation

    Again, very well said. ---------- Post added at 16:00 ---------- Previous post was at 15:57 ---------- Thanks for the code, but I can manage with PWM easily , I will make it in Verilog, is my native language :))
  5. C

    FPGA Oktokopter implementation

    Thanks for the advices, very well said. My plan is : 1. To finish debugging my codes for gyroscope an accelerometer (I am almost done with it) and to make a PWM signal generator in order to: step 2 2. Meanwhile my teammate will finish his version of ESC, and with my PWM generator we will test...
  6. C

    FPGA Oktokopter implementation

    One reason is that we already have exceeded our budget for the project(8 ESC will add an other 100$), and i will focus only in the fpga design, the ESC is my teammate job, so, he has a shot to do it, if it will work, good, if not, we will make some efforts and go to the shelf for the ESC. So...
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    FPGA Oktokopter implementation

    from FPGA I will send the PWM signal to Atmel, who will generate the apropriate signals to control the transistors, and motor. we are doing this so that the controller could be used with other master
  8. C

    FPGA Oktokopter implementation

    ESCs will be made by my teammate, he has a thread about it, opend here: Diy 30A sensorless brushless controller for Oktocopter - RC Groups I have attached the schematic. Sensors: Gyroscope: **broken link removed** Accelerometer: **broken link removed**
  9. C

    FPGA Oktokopter implementation

    Well, the PROJECT is "The oktokopter" , and when it flies I will consider close to complete. But I have still a lot of work until then, and the dead line is in May, so I still have time too.
  10. C

    FPGA Oktokopter implementation

    Thanks for the link, i have opend the code, it seems verry helpful. And yes, with a soft microprocessor would be more easy, but i don't have much experience with EDK - SDK , and beside it will be more appreciated as a good project if made in HDL
  11. C

    FPGA Oktokopter implementation

    Actualy yes, because we had a 200$ limit for the products requested. And the Nexys2 board is my personal board , so in this way i reduced the costs. I am not intending to use EDK , just describe all in HDL, I am more confortable with it. But my big problem is the PID control. I couldnt find...
  12. C

    FPGA Oktokopter implementation

    well, that was our first question also. But as I said, we are participating in a contest : Digilent Inc. - Digital Design Engineer's Source and the level is pretty high, so we thought that we have to come with something big and complex, so thats why we chose a oktokopter, and now there is no way...
  13. C

    ST L3G4200D Gyroscope not working

    Hi, I am trying to read the ST L3G4200D Gyroscope using a Nexys2 FPGA board from Digilent. I wrote the code for reading the gyroscope in Verilog, but there is something that I missed because the outputs, x, y, z, are most of the time 16 bits of 0 , or if not 16 bits of 1. So i want to check with...
  14. C

    FPGA Oktokopter implementation

    Hi guys, I am participating to a electronic design contest, and my project is a helicopter with 8 brushless motors build around a Nexys 2 board, the helicopter will be controlled wireless trough radio waves from a Microcontroller board. Also i am using for this project the following...
  15. C

    Gm C filter transfer function urgent help please

    thanks verry much, it's very useful, i figured it out about how can i reach that result...and yes, u were right, that polarity is wrong....thanks again
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