Fixed RMS calculation

wifi.py

@@ -0,0 +1,42 @@
+import network
+import utime
+
+def wifi_connect(essid, password,hostname):
+    # Connect to the wifi. Based on the example in the micropython
+    # documentation.
+    wlan = network.WLAN(network.STA_IF)
+    wlan.active(True)
+    # Set DHCP host name to recognize the device in your router
+    wlan.config(dhcp_hostname=hostname)
+    if not wlan.isconnected():
+        print('connecting to network ' + essid + '...')
+        wlan.connect(essid, password)
+        # connect() appears to be async - waiting for it to complete
+        while not wlan.isconnected():
+            print('waiting for connection...')
+            utime.sleep(4)
+            print('checking connection...')
+        print('Wifi connect successful, network config: %s' % repr(wlan.ifconfig()))
+    else:
+        # Note that connection info is stored in non-volatile memory. If
+        # you are connected to the wrong network, do an explicity disconnect()
+        # and then reconnect.
+        print('Wifi already connected, network config: %s' % repr(wlan.ifconfig()))
+
+def wifi_disconnect():
+    # Disconnect from the current network. You may have to
+    # do this explicitly if you switch networks, as the params are stored
+    # in non-volatile memory.
+    wlan = network.WLAN(network.STA_IF)
+    if wlan.isconnected():
+        print("Disconnecting...")
+        wlan.disconnect()
+    else:
+        print("Wifi not connected.")
+
+def disable_wifi_ap():
+    # Disable the built-in access point.
+    wlan = network.WLAN(network.AP_IF)
+    wlan.active(False)
+    print('Disabled access point, network status is %s' %
+          wlan.status())