diff --git a/libs/microbit/control.cpp b/libs/microbit/control.cpp
index 07fa9188..ed8479a5 100644
--- a/libs/microbit/control.cpp
+++ b/libs/microbit/control.cpp
@@ -169,7 +169,7 @@ namespace control {
     * Gets the timestamp of the last event executed on the bus
     */
     //% blockId=control_event_timestamp" block="event timestamp"
-    //% weight=19 blockGap-8
+    //% weight=19 blockGap=8
     int eventTimestamp() {
         return pxt::lastEvent.timestamp;
     }
diff --git a/libs/microbit/serial.cpp b/libs/microbit/serial.cpp
index bdd15adb..a891d36a 100644
--- a/libs/microbit/serial.cpp
+++ b/libs/microbit/serial.cpp
@@ -7,16 +7,31 @@ namespace serial {
     /**
      * Reads a line of text from the serial port.
      */
-    //%
-    StringData* readString() {
-      return uBit.serial.readUntil(ManagedString("\r\n")).leakData();
+    //% help=serial/read-line
+    //% blockId=serial_read_line block="serial read line"
+    //% weight=20
+    StringData* readLine() {
+      return uBit.serial.readUntil(ManagedString("\n")).leakData();
     }
 
     /**
      * Sends a piece of text through Serial connection.
      */
-    //% blockId=serial_writestring block="serial write %text"
+    //% help=serial/write-string
+    //% weight=87
+    //% blockId=serial_writestring block="serial write string %text"
     void writeString(StringData *text) { 
       uBit.serial.send(ManagedString(text));
     }
+    
+    /**
+    * Registers an event to be fired when one of the delimiter is matched
+    * @param delimiters the characters to match received characters against. eg:"\n"
+    */
+    //% help=serial/on-data-received
+    //% weight=19
+    void onDataReceived(StringData* delimiters, Action body) {
+      uBit.serial.eventOn(ManagedString(delimiters));
+      registerWithDal(MICROBIT_ID_SERIAL, MICROBIT_SERIAL_EVT_DELIM_MATCH, body);
+    }
 }
diff --git a/libs/microbit/serial.ts b/libs/microbit/serial.ts
index 39e86ac2..53211ed2 100644
--- a/libs/microbit/serial.ts
+++ b/libs/microbit/serial.ts
@@ -7,7 +7,8 @@ namespace serial {
      * Prints a line of text to the serial
      * @param value to send over serial
      */
-    //% help=serial/write-line
+    //% weight=90
+    //% help=serial/write-line blockGap=8
     //% blockId=serial_writeline block="serial|write line %text"
     export function writeLine(text: string): void {
         writeString(text);
@@ -17,6 +18,8 @@ namespace serial {
     /**
      * Prints a numeric value to the serial
      */
+    //% help=serial/write-number
+    //% weight=89 blockGap=8
     //% blockId=serial_writenumber block="serial|write number %value"
     export function writeNumber(value: number): void {
         writeString(value.toString());
@@ -27,13 +30,23 @@ namespace serial {
      * @param name name of the value stream, eg: x
      * @param value to write
      */
-    //% weight=80
+    //% weight=88 blockGap=8
     //% help=serial/write-value
-    //% blockId=serial_writevalue block="serial|write line %name|= %value"
+    //% blockId=serial_writevalue block="serial|write value %name|= %value"
     export function writeValue(name: string, value: number): void {
         writeString(name);
-        writeString(": ");
+        writeString(":");
         writeNumber(value);
         writeLine("");
     }
+
+    /**
+    * Registers an event to be fired when a line has been received
+    */
+    //% help=serial/on-line-received
+    //% blockId=serial_on_line_received block="serial on line received"
+    //% weight=21 blockGap=8
+    export function onLineReceived(body: Action): void {
+        serial.onDataReceived("\n", body);
+    }
 }
diff --git a/libs/microbit/shims.d.ts b/libs/microbit/shims.d.ts
index 0a89784a..4b0d11bf 100644
--- a/libs/microbit/shims.d.ts
+++ b/libs/microbit/shims.d.ts
@@ -354,7 +354,7 @@ declare namespace control {
      * Gets the timestamp of the last event executed on the bus
      */
     //% blockId=control_event_timestamp" block="event timestamp"
-    //% weight=19 blockGap-8 shim=control::eventTimestamp
+    //% weight=19 blockGap=8 shim=control::eventTimestamp
     function eventTimestamp(): number;
 
     /**
@@ -563,14 +563,26 @@ declare namespace serial {
     /**
      * Reads a line of text from the serial port.
      */
-    //% shim=serial::readString
-    function readString(): string;
+    //% help=serial/read-line
+    //% blockId=serial_read_line block="serial read line"
+    //% weight=20 shim=serial::readLine
+    function readLine(): string;
 
     /**
      * Sends a piece of text through Serial connection.
      */
-    //% blockId=serial_writestring block="serial write %text" shim=serial::writeString
+    //% help=serial/write-string
+    //% weight=87
+    //% blockId=serial_writestring block="serial write string %text" shim=serial::writeString
     function writeString(text: string): void;
+
+    /**
+     * Registers an event to be fired when one of the delimiter is matched
+     * @param delimiters the characters to match received characters against. eg:"\n"
+     */
+    //% help=serial/on-data-received
+    //% weight=19 shim=serial::onDataReceived
+    function onDataReceived(delimiters: string, body: () => void): void;
 }
 
 
diff --git a/sim/libmbit.ts b/sim/libmbit.ts
index 3c11352d..8075906d 100644
--- a/sim/libmbit.ts
+++ b/sim/libmbit.ts
@@ -429,6 +429,11 @@ namespace pxsim.serial {
     export function readString(): string {
         return board().readSerial();
     }
+
+    export function onDataReceived(delimiters: string, handler: RefAction) {
+        let b = board();
+        b.bus.listen(DAL.MICROBIT_ID_SERIAL, DAL.MICROBIT_SERIAL_EVT_DELIM_MATCH, handler);
+    }
 }