diff --git a/CMakeLists.txt b/CMakeLists.txt
index cd3fab4..932b14b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,7 +21,7 @@ elseif(${RPI})
     set(DEFAULT_RTAUDIO OFF)
     set(DEFAULT_PORTAUDIO ON)
     set(DEFAULT_ULDAQ OFF)
-
+    set(DEFAULT_DOUBLE_PRECISION OFF)
 else()
     set(DEFAULT_RTAUDIO OFF)
     set(DEFAULT_PORTAUDIO ON)
diff --git a/cpp_src/dsp/lasp_window.cpp b/cpp_src/dsp/lasp_window.cpp
index 9dedb95..fb5d7e4 100644
--- a/cpp_src/dsp/lasp_window.cpp
+++ b/cpp_src/dsp/lasp_window.cpp
@@ -11,7 +11,7 @@ using std::cerr;
 using std::endl;
 
 // Safe some typing. Linspace form 0 up to (and NOT including N).
-#define lin0N arma::linspace(0, N - 1, N)
+#define lin0N arma::linspace<vd>(0, N - 1, N)
 
 vd Window::hann(const us N) {
   return arma::pow(arma::sin((arma::datum::pi/N) * lin0N), 2);
@@ -24,8 +24,8 @@ vd Window::blackman(const us N) {
   d a0 = 7938. / 18608.;
   d a1 = 9240. / 18608.;
   d a2 = 1430. / 18608.;
-  return a0 - a1 * d_cos((2 * number_pi/N) * lin0N) +
-         a2 * d_cos((4 * number_pi / N)* lin0N );
+  return a0 - a1 * arma::cos((2 * number_pi/N) * lin0N) +
+         a2 * arma::cos((4 * number_pi / N)* lin0N );
 }
 
 vd Window::rectangular(const us N) { return arma::ones(N); }
diff --git a/cpp_src/lasp_cpp.cpp b/cpp_src/lasp_cpp.cpp
index d5c7f76..481d690 100644
--- a/cpp_src/lasp_cpp.cpp
+++ b/cpp_src/lasp_cpp.cpp
@@ -44,6 +44,12 @@ void init_siggen(py::module &m);
 
 PYBIND11_MODULE(lasp_cpp, m) {
 
+#if LASP_DOUBLE_PRECISION == 1
+  m.attr("LASP_DOUBLE_PRECISION") = true;
+#else
+  m.attr("LASP_DOUBLE_PRECISION") = false;
+#endif
+
   init_dsp(m);
   init_deviceinfo(m);
   init_daqconfiguration(m);
@@ -51,6 +57,5 @@ PYBIND11_MODULE(lasp_cpp, m) {
   init_streammgr(m);
   init_datahandler(m);
   init_siggen(m);
-
 }
-/** @} */
+/** @} */
\ No newline at end of file
diff --git a/python_src/lasp/filter/fir_design.py b/python_src/lasp/filter/fir_design.py
index 5dd26bc..ad742fb 100644
--- a/python_src/lasp/filter/fir_design.py
+++ b/python_src/lasp/filter/fir_design.py
@@ -12,6 +12,7 @@ __all__ = ['freqResponse', 'bandpass_fir_design', 'lowpass_fir_design',
 
 import numpy as np
 from scipy.signal import freqz, hann, firwin2
+from ..lasp_config import empty
 
 
 def freqResponse(fs, freq, coefs_b, coefs_a=1.):
@@ -44,7 +45,7 @@ def bandpass_fir_design(L, fs, fl, fu, window=hann):
     Omg2 = 2*np.pi*fu/fs
     Omg1 = 2*np.pi*fl/fs
 
-    fir = np.empty(L, dtype=float)
+    fir = empty(L, dtype=float)
 
     # First Create ideal band-pass filter
     fir[L//2] = (Omg2-Omg1)/np.pi
@@ -64,7 +65,7 @@ def lowpass_fir_design(L, fs, fc, window=hann):
                       " than upper cut-off"
 
     Omgc = 2*np.pi*fc/fs
-    fir = np.empty(L, dtype=float)
+    fir = empty(L, dtype=float)
 
     # First Create ideal band-pass filter
     fir[L//2] = Omgc/np.pi
diff --git a/python_src/lasp/lasp_config.py b/python_src/lasp/lasp_config.py
index 46e7af8..24074e4 100644
--- a/python_src/lasp/lasp_config.py
+++ b/python_src/lasp/lasp_config.py
@@ -6,8 +6,14 @@ Author: J.A. de Jong - ASCEE
 Description: LASP configuration
 """
 import numpy as np
+from .lasp_cpp import LASP_DOUBLE_PRECISION
 
-LASP_NUMPY_FLOAT_TYPE = np.float64
+if LASP_DOUBLE_PRECISION:
+    LASP_NUMPY_FLOAT_TYPE = np.float64
+    LASP_NUMPY_COMPLEX_TYPE = np.float128
+else:
+    LASP_NUMPY_FLOAT_TYPE = np.float32
+    LASP_NUMPY_COMPLEX_TYPE = np.float64
 
 
 def zeros(shape):
diff --git a/python_src/lasp/lasp_measurement.py b/python_src/lasp/lasp_measurement.py
index 9fb3614..5259575 100644
--- a/python_src/lasp/lasp_measurement.py
+++ b/python_src/lasp/lasp_measurement.py
@@ -64,6 +64,7 @@ from .lasp_version import LASP_VERSION_MAJOR, LASP_VERSION_MINOR
 from .lasp_cpp import Window, DaqChannel, AvPowerSpectra
 from typing import List
 from functools import lru_cache
+from .lasp_config import ones
 
 # Measurement file extension
 MEXT = 'h5'
@@ -223,7 +224,7 @@ class IterData(IterRawData):
 
     def __init__(self, fa, channels, sensitivity, **kwargs):
         super().__init__(fa, channels, **kwargs)
-        self.sens = np.asarray(sensitivity)[self.channels]
+        self.sens = np.asarray(sensitivity, dtype=LASP_NUMPY_FLOAT_TYPE)[self.channels]
         assert self.sens.ndim == 1
 
     def __next__(self):
@@ -329,10 +330,10 @@ class Measurement:
             try:
                 sens = f.attrs["sensitivity"]
                 self._sens = (
-                    sens * np.ones(self.nchannels) if isinstance(sens, float) else sens
+                    sens * ones(self.nchannels) if isinstance(sens, float) else sens
                 )
             except KeyError:
-                self._sens = np.ones(self.nchannels)
+                self._sens = ones(self.nchannels)
 
             # The time is cached AND ALWAYS ASSUMED TO BE AN IMMUTABLE OBJECT.
             # It is also cached. Changing the measurement timestamp should not
@@ -885,7 +886,7 @@ class Measurement:
         """
         if isinstance(sens, float):
             # Put all sensitivities equal
-            sens = sens * np.ones(self.nchannels)
+            sens = sens * ones(self.nchannels)
         elif isinstance(sens, list):
             sens = np.asarray(sens)
 
@@ -1199,7 +1200,7 @@ class Measurement:
             nchannels = 1
             nframes = len(data)
             data = data[:, np.newaxis]
-        sensitivity = np.ones(nchannels)
+        sensitivity = ones(nchannels)
 
         with h5.File(newfn, "w") as hf:
             hf.attrs["samplerate"] = samplerate
diff --git a/python_src/lasp/lasp_octavefilter.py b/python_src/lasp/lasp_octavefilter.py
index 2a183ac..f8aeb43 100644
--- a/python_src/lasp/lasp_octavefilter.py
+++ b/python_src/lasp/lasp_octavefilter.py
@@ -77,6 +77,7 @@ class FirFilterBank:
 
         self.fs  = fs
         self.xs = list(range(xmin, xmax + 1))
+        raise RuntimeError('Not working code anymore')
 
         maxdecimation = self.designer.firDecimation(self.xs[0])
         self.decimators = []
@@ -245,7 +246,7 @@ class SosFilterBank:
         for i, x in enumerate(self.xs):
             channel = self.designer.createSOSFilter(x)
             if sos is None:
-                sos = np.empty((channel.size, len(self.xs)))
+                sos = empty((channel.size, len(self.xs)))
             sos[:, i] = channel.flatten() 
 
         self._fb = BiquadBank(sos)
diff --git a/python_src/lasp/lasp_reverb.py b/python_src/lasp/lasp_reverb.py
index 9ac5831..88ed057 100644
--- a/python_src/lasp/lasp_reverb.py
+++ b/python_src/lasp/lasp_reverb.py
@@ -6,6 +6,7 @@ Description:
 Reverberation time estimation tool using least squares
 """
 from .lasp_common import getTime
+from .lasp_config import ones
 import numpy as np
 
 
@@ -56,7 +57,7 @@ class ReverbTime:
         x = self._t[istart:istop][:, np.newaxis]
 
         # Solve the least-squares problem, by creating a matrix of
-        A = np.hstack([x, np.ones(x.shape)])
+        A = np.hstack([x, ones(x.shape)])
 
         # print(A.shape)
         # print(points.shape)
diff --git a/python_src/lasp/lasp_slm.py b/python_src/lasp/lasp_slm.py
index 63f974b..052ea07 100644
--- a/python_src/lasp/lasp_slm.py
+++ b/python_src/lasp/lasp_slm.py
@@ -5,6 +5,7 @@ Sound level meter implementation
 @author: J.A. de Jong - ASCEE
 """
 from .lasp_cpp import cppSLM
+from .lasp_config import empty
 import numpy as np
 from .lasp_common import (TimeWeighting, FreqWeighting, P_REF)
 from .filter import SPLFilterDesigner
@@ -101,7 +102,7 @@ class SLM:
             assert fbdesigner.fs == fs
             sos_firstx = fbdesigner.createSOSFilter(self.xs[0]).flatten()
             self.nom_txt.append(fbdesigner.nominal_txt(self.xs[0]))
-            sos = np.empty((sos_firstx.size, nfilters), dtype=float, order='C')
+            sos = empty((sos_firstx.size, nfilters), dtype=float, order='C')
             sos[:, 0] = sos_firstx
 
             for i, x in enumerate(self.xs[1:]):
diff --git a/python_src/lasp/lasp_weighcal.py b/python_src/lasp/lasp_weighcal.py
index dcff2bc..38e7246 100644
--- a/python_src/lasp/lasp_weighcal.py
+++ b/python_src/lasp/lasp_weighcal.py
@@ -47,7 +47,7 @@ class WeighCal:
 
         P = 2048 # Filter length (number of taps)
 
-        self._firs = np.empty((P, self.nchannels))
+        self._firs = empty((P, self.nchannels))
         self._fbs = []
         for chan in range(self.nchannels):
             fir = arbitrary_fir_design(fs, P, freq_design,
diff --git a/python_src/lasp/tools/tools.py b/python_src/lasp/tools/tools.py
index 8caee6b..64e4cd9 100644
--- a/python_src/lasp/tools/tools.py
+++ b/python_src/lasp/tools/tools.py
@@ -21,6 +21,7 @@ import copy
 import numpy as np
 from numpy import log2, pi, sin
 from ..lasp_cpp import freqSmooth
+from ..lasp_config import zeros
 
 
 @unique
diff --git a/test/test_fft.py b/test/test_fft.py
index 09e0b4e..f4f4176 100644
--- a/test/test_fft.py
+++ b/test/test_fft.py
@@ -31,7 +31,7 @@ def test_backward_fft():
     nfft = 2048
     freq = getFreq(nfft, nfft)
     
-    # Sig = np.zeros(nfft//2+1, dtype=complex)
+    # Sig = zeros(nfft//2+1, dtype=complex)
     Sigr = np.random.randn(nfft//2+1)
     Sigi = np.random.randn(nfft//2+1)