public float GetMvPerBit(ADS1115PgaScaling gain)
{
switch (gain)
{
case ADS1115PgaScaling.TwoThirds:
return(0.187F);
case ADS1115PgaScaling.One:
return(0.125F);
case ADS1115PgaScaling.Two:
return(0.0625F);
case ADS1115PgaScaling.Four:
return(0.03125F);
case ADS1115PgaScaling.Eight:
return(0.015625F);
case ADS1115PgaScaling.Sixteen:
return(0.0078125F);
default:
throw new Exception("Unrecognized PgaScaling option");
}
}
private static byte[] BuildConfigCommand(
ADS1115MultiplexerMode mux,
ADS1115PgaScaling gain,
ADS1115SampleRate rate,
ADS1115DeviceMode mode,
ADS1115ComparatorPolarity comparatorPolarity,
ADS1115ComparatorMode comparatorMode,
ADS1115ComparatorLatching comparatorLatching,
ADS1115ComparatorQueueMode comparatorQueueMode)
{
var command = new byte[3];
command[0] = Ads1X15PointerConfig;
command[1] = (byte)((byte)mode << 7
| (byte)mux << 4
| (byte)gain << 1
| (byte)mode);
command[2] = (byte)((byte)rate << 5
| (byte)comparatorMode << 4
| (byte)comparatorPolarity << 3
| (byte)comparatorLatching << 2
| (byte)comparatorQueueMode);
return(command);
}
private void StartComparatorInternal(
ADS1115MultiplexerMode mux,
ADS1115PgaScaling gain,
ADS1115SampleRate rate,
ADS1115DeviceMode mode,
ushort lowThreshold,
ushort highThreshold,
ADS1115ComparatorPolarity comparatorPolarity,
ADS1115ComparatorMode comparatorMode,
ADS1115ComparatorLatching comparatorLatching,
ADS1115ComparatorQueueMode comparatorQueueMode)
{
WriteThreshold(lowThreshold, highThreshold);
var command = BuildConfigCommand(
mux,
gain,
rate,
mode,
comparatorPolarity,
comparatorMode,
comparatorLatching,
comparatorQueueMode);
_device.Write(command);
}
public void StartContinuousConversion(
ADS1115MultiplexerMode mux,
ADS1115PgaScaling gain = ADS1115PgaScaling.One,
ADS1115SampleRate sampleRate = ADS1115SampleRate.X250Sps)
{
StartAdcInternal(
mux,
gain,
sampleRate,
ADS1115DeviceMode.Continuous);
}
public float Read(
ADS1115MultiplexerMode mux,
ADS1115PgaScaling gain = ADS1115PgaScaling.TwoThirds,
ADS1115SampleRate rate = ADS1115SampleRate.X128Sps)
{
StartAdcInternal(
mux,
gain,
rate,
ADS1115DeviceMode.SingleShot);
Thread.Sleep(10);
var adc = GetLastConversion();
return(ConvertMillivolts(adc, gain));
}
private void StartAdcInternal(
ADS1115MultiplexerMode mux,
ADS1115PgaScaling gain,
ADS1115SampleRate rate,
ADS1115DeviceMode mode)
{
var command = BuildConfigCommand(
mux,
gain,
rate,
mode,
ADS1115ComparatorPolarity.ActiveLow,
ADS1115ComparatorMode.Traditional,
ADS1115ComparatorLatching.NonLatching,
ADS1115ComparatorQueueMode.None);
_device.Write(command);
}
public void StartComparator(
ADS1115MultiplexerMode mux,
ushort lowThreshold = 32768,
ushort highThreshHold = 32767,
ADS1115PgaScaling gain = ADS1115PgaScaling.TwoThirds,
ADS1115SampleRate sampleRate = ADS1115SampleRate.X128Sps,
ADS1115ComparatorMode comparatorMode = ADS1115ComparatorMode.Traditional,
ADS1115ComparatorPolarity comparatorPolarity = ADS1115ComparatorPolarity.ActiveLow,
ADS1115ComparatorLatching comparatorLatching = ADS1115ComparatorLatching.Latching,
ADS1115ComparatorQueueMode comparatorQueueMode = ADS1115ComparatorQueueMode.TwoConversions)
{
StartComparatorInternal(
mux,
gain,
sampleRate,
ADS1115DeviceMode.Continuous,
lowThreshold,
highThreshHold,
comparatorPolarity,
comparatorMode,
comparatorLatching,
comparatorQueueMode);
}
public float ConvertMillivolts(int value, ADS1115PgaScaling scaling)
{
return(value * GetMvPerBit(scaling));
}