diff --git a/libs/datalog/_locales/datalog-jsdoc-strings.json b/libs/datalog/_locales/datalog-jsdoc-strings.json
index ce94588a..ef31c769 100644
--- a/libs/datalog/_locales/datalog-jsdoc-strings.json
+++ b/libs/datalog/_locales/datalog-jsdoc-strings.json
@@ -11,5 +11,7 @@
   "datalog.addValue|param|value": "value of the cell, eg: 0",
   "datalog.flush": "Commits any buffered row to disk",
   "datalog.setEnabled": "Turns on or off datalogging",
+  "datalog.setSampleInterval": "Sets the minimum number of milli seconds between rows",
+  "datalog.setSampleInterval|param|millis": "milliseconds between each sample, eg: 50",
   "datalog.setStorage": "* @param storage custom storage solution"
 }
\ No newline at end of file
diff --git a/libs/datalog/_locales/datalog-strings.json b/libs/datalog/_locales/datalog-strings.json
index 003a4e46..c29dc881 100644
--- a/libs/datalog/_locales/datalog-strings.json
+++ b/libs/datalog/_locales/datalog-strings.json
@@ -2,6 +2,7 @@
   "datalog.addRow|block": "datalog add row",
   "datalog.addValue|block": "datalog add %name|=%value",
   "datalog.setEnabled|block": "datalog %enabled=toggleOnOff",
+  "datalog.setSampleInterval|block": "set datalog sampling interval to %millis|(ms)",
   "datalog|block": "datalog",
   "{id:category}Datalog": "Datalog"
 }
\ No newline at end of file
diff --git a/libs/datalog/targetoverrides.ts b/libs/datalog/targetoverrides.ts
index 943cb42d..db11423f 100644
--- a/libs/datalog/targetoverrides.ts
+++ b/libs/datalog/targetoverrides.ts
@@ -2,7 +2,7 @@ namespace datalog.ev3 {
     /**
      * A datalog storage for the EV3
      */
-    export class EV3DatalogStorage extends DatalogStorage { // implements DatalogStorage {
+    export class EV3DatalogStorage extends DatalogStorage {
         private _filename: string;
         private _buffer: string;
         private _storage: storage.Storage;
@@ -38,18 +38,18 @@ namespace datalog.ev3 {
             // commit row data
             this._buffer += storage.toCSV(values, this._storage.csvSeparator);
             // buffered writes
-            if (this._buffer.length > 1024)
+            if (this._buffer.length > 512)
                 this.flush();
         }
         /**
          * Flushes any buffered data
          */
         flush(): void {
-            if (this._buffer) {
+            if (this._buffer) {                                
                 const b = this._buffer;
                 this._buffer = "";
                 this._storage.append(this._filename, b);
-            }    
+            }
         }
     }
     // automatic hook up
diff --git a/package.json b/package.json
index 31fbf7d4..b8bb5442 100644
--- a/package.json
+++ b/package.json
@@ -44,8 +44,8 @@
     "webfonts-generator": "^0.4.0"
   },
   "dependencies": {
-    "pxt-common-packages": "0.17.12",
-    "pxt-core": "3.0.26"
+    "pxt-common-packages": "0.17.13",
+    "pxt-core": "3.0.29"
   },
   "scripts": {
     "test": "node node_modules/pxt-core/built/pxt.js travis"