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Recent content by yazou35

  1. Y

    automatic switch betwen two power supplies for one circuit

    Re: automatic switch betwen two power supplies for one circu Hello, Did you look at the autoswitching power muxs ? https://focus.ti.com/lit/ds/symlink/tps2111a.pdf
  2. Y

    ultra low power accelerometer

    Hi, I want to design an acceleration measurement circuit that draws less than one microampere. I will use a capacitive piezo sensor and a FET buffer (Figure 40 in this document ) : **broken link removed** I'm looking for a FET to use as buffer that draws about 200 nA. Does a such FET exist ...
  3. Y

    Help me to calculate Temperature from this equation!

    Re: how to solve it No, Increasing the polynomial order will increase the computation complexity. If the computation is done on a microcontroller you must choose a small order. The linearaization means "replace high order polynomial with many small order ones". My software look for the biggest...
  4. Y

    Help me to calculate Temperature from this equation!

    Re: how to solve it Hello, The LinSens program is a Windows console programm. So you must run it in a Dos command window. I ran it on your nickel.dat file and here are the results. You can use these results directly for your nickel linearization ...
  5. Y

    Help me to calculate Temperature from this equation!

    Re: how to solve it hello, You can use my software posted in this topic : You can use Excel to generate a text file containy the data of your RTD in two columns. The first column is T and the second column is R values. Then you run my linSens program on your file. The linSens program will...
  6. Y

    code in c for temperature

    I posted here my linsens software : This a windows console program that do the same thing as the matlab code. I hope this will help you. Yazou
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    Linearization software program - freeware

    data linearisation software Hello, I post here My LinSens softawre. LinSens Linearization Software Description : LinSens is a linearization software. It was written to make linearization of sensor data. It was tested with thermocouple and platinium temperature sensors. The LinSens program...
  8. Y

    code in c for temperature

    Hello, you can avoid the power function using a recursive computation. Let P(x)=a4 x^4 + a3 x^3 + a2 x^2 +a1 x + a0 you can write it as : P(x)= (((a4*x + a3) *x + a2)*x + a1)*x + a0 you can compute P(x) using a loop like this : y =a4 for (i=3;i>0;i--) { y=y*x+a(i-1) } Added after 2 hours...
  9. Y

    Does filtering of QPSK changes the BER performance?

    Filtered QPSK BER Hello, After modulating using QPSK the spectrum of modulated signal decrease as (sinc(pi*f*T))^2. In order to decrease the interference with adjacent channels we can use a BPF on the modulated signal. Does you know if this filtering changes the BER performance of the...
  10. Y

    thermocouple temperature

    thermocouple maxim Hello, you can simplify the problem by making a linearization of your high order polynomials by using lower order polynomials on smaller intervalls. I send here a matlab program linc5 that make linearization of sensor data into polynomials. You can input the polynoimial...
  11. Y

    Using GSM module with a mp3 reader hardware

    Re: mp3+GSM module Help , Nobody has already used gsm modules and can tell me if we can get the audio stream from theses modules ? thank you
  12. Y

    solving polynomial in mcu

    Hello, you can simplify the problem by making a linearization of your high order polynomials by using lower order polynomials on smaller intervalls. I send here a matlab program linc5 that make linearization of sensor data into polynomials. You can input the polynoimial order and the max...
  13. Y

    Using GSM module with a mp3 reader hardware

    Re: mp3+GSM module Thank you all for your answers. My problem is the not hardawre ton interface the gsm module. I have already ARM and hardware that can play mp3 and record mp3 on a MMC card. I'd like to know of the gsm module (wavecom or other) can direct the (compressed)audio stream to my...
  14. Y

    MSK modulation with FSK chip

    fsk chip Hello, Many low cost ism transceiver support OOK , ASK and FSK. can we make MSK modulation with these chips even if it'n not clearly specified in the data sheet. I saw in some book that MSK is a special cas of FSK with DF=datarate/2. Is a modem that support GFSK can modulate and...
  15. Y

    Training sequence for channel estimation

    training sequence channel estimation Hello, May be these links could help you. **broken link removed** http://www.sce.carleton.ca/courses/94566/course_notes/WPMCpaper.pdf http://goanna.cs.rmit.edu.au/~ronvs/papers/SPIE3657.PDF **broken link removed**
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