diff --git a/main.py b/main.py
index 8b13789..6e3105b 100644
--- a/main.py
+++ b/main.py
@@ -1 +1,149 @@
+# the communicator data
+communicator_data = {
+    'radio': {
+        'groupID': 1.0,
+        'receivedSignal': 0
+    },
+    'mode': {
+        'changeChannelMode': False
+    },
+    'received': {
+        'ID': 0
+    }
+}
 
+# sound effects
+communicator_sounds = {
+    'beep': {
+        'tone': Note.C5,
+        'speed': music.beat(BeatFraction.EIGHTH)
+    },
+    'call': {
+        'tone': Note.G
+    }
+}
+
+def changeChannelMode(adjustIncrement = 0):
+    """
+        changeChannelMode allows the changing of radio channels.
+
+        Parameters:
+            adjustIncrement: (integer) how much to adjust
+        Returns:
+            groupID: (integer) the current channel ID
+    """
+
+    # Enable the change channel and ID mode.
+    communicator_data['mode']['changeChannelMode'] = True
+
+    # The groupID variable includes the channel number (integer) and the device's identifier (non-integer). 
+    if (adjustIncrement):
+        if (adjustIncrement >= 1):
+            # Increase the selected ID number!
+            communicator_data['radio']['groupID'] += 0.1
+        elif (adjustIncrement <= -1) and (communicator_data['radio']['groupID'] > 1):
+            # Decrease the selected ID number!
+            communicator_data['radio']['groupID'] = communicator_data['radio']['groupID'] - 0.1
+        
+        # Get device channel only. 
+        device_groupID = str(communicator_data['radio']['groupID'])
+        device_channelNumber = int(device_groupID.split('.')[0])
+
+        # Set the group number properly. 
+        radio.set_group(device_channelNumber)
+    
+    # Stop the animation and show the number. 
+    led.stop_animation()
+    basic.show_number(communicator_data['radio']['groupID'])
+
+def message_send(): 
+    """
+        Send the message. 
+
+        Parameters: none
+        Returns: none
+    """
+
+    # Convert
+    device_groupID = str(communicator_data['radio']['groupID'])
+
+    # Get the device number only. 
+    device_number = int((device_groupID.split("."))[1])
+
+    # Broadcast the message. 
+    radio.send_number(device_number)
+
+def message_receive():
+    """
+        Display the received message. 
+
+        Parameters: none
+        Returns: none
+    """
+
+    # Get the device number only.
+    device_receive_number = communicator_data['received']['ID']
+
+    # Display the device number. 
+    basic.show_number(device_receive_number)
+
+    # Ring.
+    music.ring_tone(communicator_sounds['call']['tone'])
+
+    # Pause. 
+    basic.pause(5000)
+
+    # Stop. 
+    basic.clear_screen()
+    music.stop_all_sounds()
+
+def on_button_pressed_ab():
+    # Play the button clicked sound.
+    music.play_tone(communicator_sounds['beep']['tone'], communicator_sounds['beep']['speed'])
+    
+    # Stop the animation. 
+    led.stop_animation()
+    
+    # allow the toggling of channel changing
+    if not(communicator_data['mode']['changeChannelMode']):
+        changeChannelMode()
+    
+    else:
+        communicator_data['mode']['changeChannelMode'] = False
+        basic.clear_screen()
+
+def on_button_pressed_a():
+    # Play the button clicked sound.
+    music.play_tone(communicator_sounds['beep']['tone'], communicator_sounds['beep']['speed'])
+    
+    # Stop the animation.
+    led.stop_animation()
+   
+    if (communicator_data['mode']['changeChannelMode']):
+        changeChannelMode(-1)
+    else:
+        # A button is mapped to short sounds.
+        message_send()
+
+def on_button_pressed_b():
+    # Play the button clicked sound.
+    music.play_tone(communicator_sounds['beep']['tone'], communicator_sounds['beep']['speed'])
+        
+    # Stop the animation.
+    led.stop_animation()
+    
+    if (communicator_data['mode']['changeChannelMode']):
+        changeChannelMode(1)
+    else:
+        # B button is mapped to the longer sound
+        message_send()
+
+input.on_button_pressed(Button.AB, on_button_pressed_ab)
+input.on_button_pressed(Button.A, on_button_pressed_a)
+input.on_button_pressed(Button.B, on_button_pressed_b)
+
+def on_received_number(receivedNumber):
+    communicator_data['received']['ID'] = receivedNumber
+    message_receive()
+
+radio.on_received_number(on_received_number)
\ No newline at end of file
diff --git a/main.ts b/main.ts
index 8b13789..9ffbb4b 100644
--- a/main.ts
+++ b/main.ts
@@ -1 +1,147 @@
+//  the communicator data
+let communicator_data = {
+    "radio" : {
+        "groupID" : 1.0,
+        "receivedSignal" : 0,
+    }
+    ,
+    "mode" : {
+        "changeChannelMode" : false,
+    }
+    ,
+    "received" : {
+        "ID" : 0,
+    }
+    ,
+}
 
+//  sound effects
+let communicator_sounds = {
+    "beep" : {
+        "tone" : Note.C5,
+        "speed" : music.beat(BeatFraction.Eighth),
+    }
+    ,
+    "call" : {
+        "tone" : Note.G,
+    }
+    ,
+}
+
+function changeChannelMode(adjustIncrement: number = 0) {
+    let device_groupID: string;
+    let device_channelNumber: number;
+    /** 
+        changeChannelMode allows the changing of radio channels.
+
+        Parameters:
+            adjustIncrement: (integer) how much to adjust
+        Returns:
+            groupID: (integer) the current channel ID
+    
+ */
+    //  Enable the change channel and ID mode.
+    communicator_data["mode"]["changeChannelMode"] = true
+    //  The groupID variable includes the channel number (integer) and the device's identifier (non-integer). 
+    if (adjustIncrement) {
+        if (adjustIncrement >= 1) {
+            //  Increase the selected ID number!
+            communicator_data["radio"]["groupID"] += 0.1
+        } else if (adjustIncrement <= -1 && communicator_data["radio"]["groupID"] > 1) {
+            //  Decrease the selected ID number!
+            communicator_data["radio"]["groupID"] = communicator_data["radio"]["groupID"] - 0.1
+        }
+        
+        //  Get device channel only. 
+        device_groupID = "" + communicator_data["radio"]["groupID"]
+        device_channelNumber = parseInt(_py.py_string_split(device_groupID, ".")[0])
+        //  Set the group number properly. 
+        radio.setGroup(device_channelNumber)
+    }
+    
+    //  Stop the animation and show the number. 
+    led.stopAnimation()
+    basic.showNumber(communicator_data["radio"]["groupID"])
+}
+
+function message_send() {
+    /** 
+        Send the message. 
+
+        Parameters: none
+        Returns: none
+    
+ */
+    //  Convert
+    let device_groupID = "" + communicator_data["radio"]["groupID"]
+    //  Get the device number only. 
+    let device_number = parseInt(_py.py_string_split(device_groupID, ".")[1])
+    //  Broadcast the message. 
+    radio.sendNumber(device_number)
+}
+
+function message_receive() {
+    /** 
+        Display the received message. 
+
+        Parameters: none
+        Returns: none
+    
+ */
+    //  Get the device number only.
+    let device_receive_number = communicator_data["received"]["ID"]
+    //  Display the device number. 
+    basic.showNumber(device_receive_number)
+    //  Ring.
+    music.ringTone(communicator_sounds["call"]["tone"])
+    //  Pause. 
+    basic.pause(5000)
+    //  Stop. 
+    basic.clearScreen()
+    music.stopAllSounds()
+}
+
+input.onButtonPressed(Button.AB, function on_button_pressed_ab() {
+    //  Play the button clicked sound.
+    music.playTone(communicator_sounds["beep"]["tone"], communicator_sounds["beep"]["speed"])
+    //  Stop the animation. 
+    led.stopAnimation()
+    //  allow the toggling of channel changing
+    if (!communicator_data["mode"]["changeChannelMode"]) {
+        changeChannelMode()
+    } else {
+        communicator_data["mode"]["changeChannelMode"] = false
+        basic.clearScreen()
+    }
+    
+})
+input.onButtonPressed(Button.A, function on_button_pressed_a() {
+    //  Play the button clicked sound.
+    music.playTone(communicator_sounds["beep"]["tone"], communicator_sounds["beep"]["speed"])
+    //  Stop the animation.
+    led.stopAnimation()
+    if (communicator_data["mode"]["changeChannelMode"]) {
+        changeChannelMode(-1)
+    } else {
+        //  A button is mapped to short sounds.
+        message_send()
+    }
+    
+})
+input.onButtonPressed(Button.B, function on_button_pressed_b() {
+    //  Play the button clicked sound.
+    music.playTone(communicator_sounds["beep"]["tone"], communicator_sounds["beep"]["speed"])
+    //  Stop the animation.
+    led.stopAnimation()
+    if (communicator_data["mode"]["changeChannelMode"]) {
+        changeChannelMode(1)
+    } else {
+        //  B button is mapped to the longer sound
+        message_send()
+    }
+    
+})
+radio.onReceivedNumber(function on_received_number(receivedNumber: number) {
+    communicator_data["received"]["ID"] = receivedNumber
+    message_receive()
+})