/// <summary>
/// Constructs a new PWMResistive Heater
/// </summary>
/// <param name="deviceName">The device on which the pwm counter sits</param>
/// <param name="pwmCounterName">The name of the counter to use</param>
/// <param name="pwmCounterOutput">The pin on which to generate the output</param>
public PWMResistiveHeater(string deviceName, string pwmCounterName, string pwmCounterOutput)
{
MinOutput = 0.001;
//By default limit maximum duty cycle of this
//heater to 50%
MaxOutput = 0.5;
//Set default generation frequency to 500 Hz
_pwmSignal = new CODataFrequency(500, MinOutput);
string connection = deviceName + "/" + pwmCounterName;
//create our pwm task, set up a counter channelr on the output pin and configure it to run until stopped
_pwmTask = new Task("ResistiveHeater_" + deviceName + pwmCounterName);
_pwmTask.COChannels.CreatePulseChannelFrequency(connection, "", COPulseFrequencyUnits.Hertz, COPulseIdleState.Low, 0, _pwmSignal.Frequency, _pwmSignal.DutyCycle);
_pwmTask.Timing.ConfigureImplicit(SampleQuantityMode.ContinuousSamples);
_pwmTask.ExportSignals.CounterOutputEventOutputTerminal = pwmCounterOutput;
//create writer
_pwmWriter = new CounterSingleChannelWriter(_pwmTask.Stream);
//start task
_pwmTask.Start();
_pwmWriter.WriteSingleSample(false, _pwmSignal);
}
/*public string[] PeltierModes {
* get { return Enum.GetNames(typeof(PeltierMode)); }
* }*/
/// <summary>
/// Constructor of Peltier control class
/// </summary>
/// <param name="deviceName">The device name of the NI board, f.e. dev1</param>
/// <param name="pwmCounterName">The name of the counter to use for this peltier, f.e. ctr0</param>
/// <param name="pwmCounterOutput">The pinout of the counter (?) f.e. PFI12</param>
/// <param name="pwmFrequency">The frequency of the PWM on the counter</param>
/// <param name="heatingPolarityDOLine">The digital out line for the polarity switch</param>
public Peltier(string deviceName, string pwmCounterName, string pwmCounterOutput, double pwmFrequency, string heatingPolarityDOLine)
{
if (ViewModelBase.IsInDesignMode)
{
DutyCycle = .2;
PeltierMode = PeltierModes.Heat;
return;
}
doHeatingPolarityTask = new Task();
doHeatingPolarityTask.DOChannels.CreateChannel(deviceName + "/" + heatingPolarityDOLine, "", ChannelLineGrouping.OneChannelForAllLines);
doHeatingPolarityWriter = new DigitalSingleChannelWriter(doHeatingPolarityTask.Stream);
PeltierMode = PeltierModes.Heat;
dataFrequency = new CODataFrequency(pwmFrequency, MinDutyCycle);
pwmTask = new Task("Peltier " + deviceName + " " + pwmCounterName);
pwmTask.COChannels.CreatePulseChannelFrequency(deviceName + "/" + pwmCounterName, "", COPulseFrequencyUnits.Hertz, COPulseIdleState.Low, 0, dataFrequency.Frequency, dataFrequency.DutyCycle);
pwmTask.Timing.ConfigureImplicit(SampleQuantityMode.ContinuousSamples);
pwmTask.ExportSignals.CounterOutputEventOutputTerminal = pwmCounterOutput;
pwmWriter = new CounterSingleChannelWriter(pwmTask.Stream);
pwmTask.Start();
DutyCycle = 0;
}
