AD5933 - Part4 （Arduino Library Example)
arduino-ad5933/examples/ad5933-test/ad5933-test.ino
2016may04
| /* | |
| ad5933-test | |
| Reads impedance values from the AD5933 over I2C and prints them serially. | |
| */ | |
| #include <Wire.h> | |
| #include "AD5933.h" | |
| #define START_FREQ (80000) | |
| #define FREQ_INCR (1000) | |
| #define NUM_INCR (40) | |
| #define REF_RESIST (10000) | |
| double gain[NUM_INCR+1]; | |
| int phase[NUM_INCR+1]; | |
| void setup(void) | |
| { | |
| // Begin I2C | |
| Wire.begin(); | |
| // Begin serial at 9600 baud for output | |
| Serial.begin(9600); | |
| Serial.println("AD5933 Test Started!"); | |
| // Perform initial configuration. Fail if any one of these fail. | |
| if (!(AD5933::reset() && | |
| AD5933::setInternalClock(true) && | |
| AD5933::setStartFrequency(START_FREQ) && | |
| AD5933::setIncrementFrequency(FREQ_INCR) && | |
| AD5933::setNumberIncrements(NUM_INCR) && | |
| AD5933::setPGAGain(PGA_GAIN_X1))) | |
| { | |
| Serial.println("FAILED in initialization!"); | |
| while (true) ; | |
| } | |
| // Perform calibration sweep | |
| if (AD5933::calibrate(gain, phase, REF_RESIST, NUM_INCR+1)) | |
| Serial.println("Calibrated!"); | |
| else | |
| Serial.println("Calibration failed..."); | |
| } | |
| void loop(void) | |
| { | |
| // Easy to use method for frequency sweep | |
| frequencySweepEasy(); | |
| // Delay | |
| delay(5000); | |
| // Complex but more robust method for frequency sweep | |
| frequencySweepRaw(); | |
| // Delay | |
| delay(5000); | |
| } | |
| // Easy way to do a frequency sweep. Does an entire frequency sweep at once and | |
| // stores the data into arrays for processing afterwards. This is easy-to-use, | |
| // but doesn't allow you to process data in real time. | |
| void frequencySweepEasy() { | |
| // Create arrays to hold the data | |
| int real[NUM_INCR+1], imag[NUM_INCR+1]; | |
| // Perform the frequency sweep | |
| if (AD5933::frequencySweep(real, imag, NUM_INCR+1)) { | |
| // Print the frequency data | |
| int cfreq = START_FREQ/1000; | |
| for (int i = 0; i < NUM_INCR+1; i++, cfreq += FREQ_INCR/1000) { | |
| // Print raw frequency data | |
| Serial.print(cfreq); | |
| Serial.print(": R="); | |
| Serial.print(real[i]); | |
| Serial.print("/I="); | |
| Serial.print(imag[i]); | |
| // Compute impedance | |
| double magnitude = sqrt(pow(real[i], 2) + pow(imag[i], 2)); | |
| double impedance = 1/(magnitude*gain[i]); | |
| Serial.print(" |Z|="); | |
| Serial.println(impedance); | |
| } | |
| Serial.println("Frequency sweep complete!"); | |
| } else { | |
| Serial.println("Frequency sweep failed..."); | |
| } | |
| } | |
| // Removes the frequencySweep abstraction from above. This saves memory and | |
| // allows for data to be processed in real time. However, it's more complex. | |
| void frequencySweepRaw() { | |
| // Create variables to hold the impedance data and track frequency | |
| int real, imag, i = 0, cfreq = START_FREQ/1000; | |
| // Initialize the frequency sweep | |
| if (!(AD5933::setPowerMode(POWER_STANDBY) && // place in standby | |
| AD5933::setControlMode(CTRL_INIT_START_FREQ) && // init start freq | |
| AD5933::setControlMode(CTRL_START_FREQ_SWEEP))) // begin frequency sweep | |
| { | |
| Serial.println("Could not initialize frequency sweep..."); | |
| } | |
| // Perform the actual sweep | |
| while ((AD5933::readStatusRegister() & STATUS_SWEEP_DONE) != STATUS_SWEEP_DONE) { | |
| // Get the frequency data for this frequency point | |
| if (!AD5933::getComplexData(&real, &imag)) { | |
| Serial.println("Could not get raw frequency data..."); | |
| } | |
| // Print out the frequency data | |
| Serial.print(cfreq); | |
| Serial.print(": R="); | |
| Serial.print(real); | |
| Serial.print("/I="); | |
| Serial.print(imag); | |
| // Compute impedance | |
| double magnitude = sqrt(pow(real, 2) + pow(imag, 2)); | |
| double impedance = 1/(magnitude*gain[i]); | |
| Serial.print(" |Z|="); | |
| Serial.println(impedance); | |
| // Increment the frequency | |
| i++; | |
| cfreq += FREQ_INCR/1000; | |
| AD5933::setControlMode(CTRL_INCREMENT_FREQ); | |
| } | |
| Serial.println("Frequency sweep complete!"); | |
| // Set AD5933 power mode to standby when finished | |
| if (!AD5933::setPowerMode(POWER_STANDBY)) | |
| Serial.println("Could not set to standby..."); | |
| } |
