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Recent content by nanana_1011

  1. N

    Image Enhancement in the Spatial Domain Or Frequency Domain

    Hello! How do we choose the domain of the image enhancement? Also, if someone provides two "identical" images, can we confirm that the domain it applies?
  2. N

    Differential Sensor Advantage

    Hi, For a differential sensor, the external reference capacitor is 50pF. One is a variable capacitor 50 + (0-5)pF. What is the difference if I just use 1 variable capacitor?
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    Arduino I2C to ZSSC3123

    I find that Arduino only needs first high 7 bits. I think it does not need to write last bit. But I still do not know how to enter command mode and retrieve the value of register. - - - Updated - - - Anyone help?
  4. N

    Arduino I2C to ZSSC3123

    Now I add 1 more. Wire.beginTransmission(0x50); But all are 255. I see that the IC will send something called slave ACK which is 1 bit. Do I wait for that ACK before sending requestFrom? Is my address of the device wrong? I see that it is set 0101000 as default. Then is it 0x50?
  5. N

    Arduino I2C to ZSSC3123

    Hello! I want to retrieve the value of C_Config. My code: Wire.begin(); Wire.beginTransmission(0x50); Wire.write(0xA0); // Enter the command mode Wire.endTransmission(); Wire.requestFrom(0x06, 3); // Retrieve the value of C_Config byte a = Wire.read(); byte...
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    [Moved]: AD7746 + Arduino Uno I2C

    Also, if I retrieve value from IC, it is 2 bytes. Do I save the value and obtain the high byte and then low byte?
  7. N

    [Moved]: AD7746 + Arduino Uno I2C

    Are you familiar with this IC?
  8. N

    [Moved]: AD7746 + Arduino Uno I2C

    It is ZSSC3123.
  9. N

    [Moved]: AD7746 + Arduino Uno I2C

    Hello! For I2C in arduino, the register is 1 byte. If I have another IC having 2-byte register, how can I communicate with it using arduino?
  10. N

    [Moved]: AD7746 + Arduino Uno I2C

    Hi, 0x90 = read address 0x91 = write address If I use arduino uno to read the registers from AD7746, should I use 0x90 or 0x91?
  11. N

    LC Meter -- colpitts oscillator

    I am little confused about differential and single-ended channels.
  12. N

    LC Meter -- colpitts oscillator

    24-Bit Capacitance-to-Digital Converter with Temperature Sensor What is the meaning of with Temperature Sensor? It is a 16-pin one. How should I look the datasheet? For this converters, do I need to program it? I think there are many things I do not understand. Resolution down to 4 aF (that is...
  13. N

    LC Meter -- colpitts oscillator

    Yes! The result should be in range of 0m - 10000m with 10cm resolution. If the range of capacitance is 0 - 4pF, it should be 0.00004pF resolution. Am I right? I am trying to use this method to have smaller resolution as I can. - - - Updated - - - result is the altitude sensor is changing...
  14. N

    LC Meter -- colpitts oscillator

    To have 0.0001pF, we should have higher resolution of frequency. Is there any method to get higher resolution of frequency? Can I prolong the time for measure the occurences and later on, just divide the measurement by the time?
  15. N

    LC Meter -- colpitts oscillator

    Hey Peter, I have watched your doc. I see that the circuit has a switch to measure 2 frequencies. But for Kerry Wong one, I do not see any switch to measure 2 frequencies.

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