diff --git a/.vscode/settings.json b/.vscode/settings.json
index 6786d63..d5bc66e 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,6 +1,6 @@
 {
     "terminal.integrated.env.osx": {
-        "PATH": "/Users/rmh78/.platformio/penv/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin"
+        "PATH": "/Users/rmh78/.platformio/penv/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/Users/rmh78/esp/xtensa-esp32-elf/bin"
     },
     "platformio-ide.forceUploadAndMonitor": true,
     "files.associations": {
diff --git a/data/no2-data_calibration_20180105.ods b/data/no2-data_calibration_20180105.ods
index ef8364c..10e3d52 100644
Binary files a/data/no2-data_calibration_20180105.ods and b/data/no2-data_calibration_20180105.ods differ
diff --git a/platformio.ini b/platformio.ini
index 825f8d5..d452563 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -9,7 +9,7 @@
 ; http://docs.platformio.org/page/projectconf.html
 
 [env:heltec_wifi_lora_32]
-platform = espressif32
+platform = https://github.com/platformio/platform-espressif32.git
 board = heltec_wifi_lora_32
 framework = arduino
 
diff --git a/src/main.cpp b/src/main.cpp
index 1a7e40a..92f2cff 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -9,7 +9,6 @@
  * - TOGGLE_MODE - only measurement unless the button is pressed which causes sending all stored messages
  */
 
-#include <Arduino.h>
 #include <lmic.h>
 #include <hal/hal.h>
 #include <SPI.h>