diff --git a/csdr.py b/csdr.py
index a7f1f89..2d0d310 100755
--- a/csdr.py
+++ b/csdr.py
@@ -374,7 +374,6 @@ class dsp:
             self.set_squelch_level(self.squelch_level)
         if self.smeter_pipe != None:
             self.smeter_pipe_file=open(self.smeter_pipe,"r")
-            self.set_pipe_nonblocking(self.smeter_pipe_file)
 
         self.start_secondary_demodulator()
 
diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index 980a6ae..f5a17b4 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -1181,6 +1181,9 @@ function on_ws_recv(evt)
 						waterfall_init();
 						audio_preinit();
                     break;
+                    case "smeter":
+                        setSmeterAbsoluteValue(json.value);
+                    break;
                     default:
                         console.warn('received message of unknown type', json);
 		        }
diff --git a/owrx/controllers.py b/owrx/controllers.py
index 90e3405..fe4dac2 100644
--- a/owrx/controllers.py
+++ b/owrx/controllers.py
@@ -1,7 +1,7 @@
 import mimetypes
 from owrx.websocket import WebSocketConnection
 from owrx.config import PropertyManager
-from owrx.source import SpectrumThread, DspThread
+from owrx.source import SpectrumThread, DspManager
 import json
 
 class Controller(object):
@@ -53,6 +53,8 @@ class SpectrumForwarder(object):
         self.conn.send(bytes([0x01]) + data)
     def write_dsp_data(self, data):
         self.conn.send(bytes([0x02]) + data)
+    def write_s_meter_level(self, level):
+        self.conn.send({"type":"smeter","value":level})
 
 class WebSocketMessageHandler(object):
     def __init__(self):
@@ -77,7 +79,7 @@ class WebSocketMessageHandler(object):
             self.forwarder = SpectrumForwarder(conn)
             SpectrumThread.getSharedInstance().add_client(self.forwarder)
 
-            self.dsp = DspThread(self.forwarder)
+            self.dsp = DspManager(self.forwarder)
 
         else:
             try:
diff --git a/owrx/source.py b/owrx/source.py
index e135cde..e1ab9e2 100644
--- a/owrx/source.py
+++ b/owrx/source.py
@@ -2,7 +2,6 @@ import subprocess
 from owrx.config import PropertyManager
 import threading
 import csdr
-import time
 
 class RtlNmuxSource(object):
     def __init__(self):
@@ -88,7 +87,7 @@ class SpectrumThread(threading.Thread):
         SpectrumThread.sharedInstance = None
         self.doRun = False
 
-class DspThread(threading.Thread):
+class DspManager(object):
     def __init__(self, handler):
         self.doRun = True
         self.handler = handler
@@ -138,12 +137,21 @@ class DspThread(threading.Thread):
 
         super().__init__()
 
-    def run(self):
+    def start(self):
         self.dsp.start()
+        threading.Thread(target = self.readDspOutput).start()
+        threading.Thread(target = self.readSMeterOutput).start()
+
+    def readDspOutput(self):
         while (self.doRun):
             data = self.dsp.read(256)
             self.handler.write_dsp_data(data)
 
+    def readSMeterOutput(self):
+        while (self.doRun):
+            level = self.dsp.get_smeter_level()
+            self.handler.write_s_meter_level(level)
+
     def stop(self):
         self.doRun = False