diff --git a/cardioception/HRD/parameters.py b/cardioception/HRD/parameters.py
index 25bd16c1..900d766f 100644
--- a/cardioception/HRD/parameters.py
+++ b/cardioception/HRD/parameters.py
@@ -383,6 +383,10 @@ def getParameters(
             serial=port, sfreq=75, add_channels=1, **systole_kw
         )
         parameters["oxiTask"].setup().read(duration=1)
+        
+        # # for Nonin 3231 USB
+        # parameters['oxiTask'] = Nonin3231USB(serial=port, add_channels=1).setup().read(1)
+
     elif setup == "test":
         # Use pre-recorded pulse time series for testing
         port = serialSim()
diff --git a/cardioception/HRD/task.py b/cardioception/HRD/task.py
index 14508733..e813b202 100644
--- a/cardioception/HRD/task.py
+++ b/cardioception/HRD/task.py
@@ -444,6 +444,14 @@ def trial(
             # Only use the last 5 seconds of the recording
             bpm = 60000 / np.diff(np.where(peaks[-5000:])[0])
 
+            
+            # # for Nonin3231USB
+            # # Only use the last 5 seconds of the recording
+            # bpm =  pd.Series(parameters["oxiTask"].read(duration=5.0).bpm)[-5:]
+            # # use bpm as signal, Nonin3231USB gives no raw signal
+            # signal = bpm
+
+
             print(f"... bpm: {[round(i) for i in bpm]}")
 
             # Prevent crash if NaN value