diff --git a/apps/zambretti/app.js b/apps/zambretti/app.js
index 69e226ac0..6ba88c591 100644
--- a/apps/zambretti/app.js
+++ b/apps/zambretti/app.js
@@ -38,44 +38,44 @@ Z: /*LANG*/'Stormy, much rain',
 };
 
 const ZAMBRETTI_FALLING = {
-	1050: 'A',
-	1040: 'B',
-	1024: 'C',
-	1018: 'H',
-	1010: 'O',
-	1004: 'R',
-	 998: 'U',
-	 991: 'V',
-	 985: 'X',
+1050: 'A',
+1040: 'B',
+1024: 'C',
+1018: 'H',
+1010: 'O',
+1004: 'R',
+ 998: 'U',
+ 991: 'V',
+ 985: 'X',
 };
 
 const ZAMBRETTI_STEADY = {
-	1033: 'A',
-	1023: 'B',
-	1014: 'E',
-	1008: 'K',
-	1000: 'N',
-	 994: 'P',
-	 989: 'S',
-	 981: 'W',
-	 974: 'X',
-	 960: 'Z',
+1033: 'A',
+1023: 'B',
+1014: 'E',
+1008: 'K',
+1000: 'N',
+ 994: 'P',
+ 989: 'S',
+ 981: 'W',
+ 974: 'X',
+ 960: 'Z',
 };
 
 const ZAMBRETTI_RISING = {
-	1030: 'A',
-	1022: 'B',
-	1012: 'C',
-	1007: 'F',
-	1000: 'G',
-	 995: 'I',
-	 990: 'J',
-	 984: 'L',
-	 978: 'M',
-	 970: 'Q',
-	 965: 'T',
-	 959: 'Y',
-	 947: 'Z',
+1030: 'A',
+1022: 'B',
+1012: 'C',
+1007: 'F',
+1000: 'G',
+ 995: 'I',
+ 990: 'J',
+ 984: 'L',
+ 978: 'M',
+ 970: 'Q',
+ 965: 'T',
+ 959: 'Y',
+ 947: 'Z',
 };
 
 function correct_season(letter, dir) {
@@ -132,7 +132,7 @@ function showMenu() {
         loadSettings();
         showMenu();
       }),
-    'Plot history': () => {E.showMenu(); history();},
+    'Plot history': () => {E.showMenu(); plot();},
   };
   E.showMenu(menu);
 }
@@ -181,7 +181,7 @@ function show() {
   Bangle.getPressure().then(p =>{if (p) draw(p.temperature);});
 }
 
-function history() {
+function plot() {
   const interval = 15; // minutes
   const history3 = require('Storage').readJSON("zambretti.log.json", true) || []; // history of recent 3 hours
 
diff --git a/apps/zambretti/boot.js b/apps/zambretti/boot.js
index 3d23e2a44..438ac7cfc 100644
--- a/apps/zambretti/boot.js
+++ b/apps/zambretti/boot.js
@@ -4,11 +4,11 @@
   const history3 = require('Storage').readJSON(LOG_FILE, true) || []; // history of recent 3 hours
   let currentPressures = [];
 
-  isValidPressureValue = (pressure) => {
+  const isValidPressureValue = (pressure) => {
     return !(pressure == undefined || pressure <= 0);
   };
 
-  calculcate3hAveragePressure = () => {
+  const calculcate3hAveragePressure = () => {
     if (history3 != undefined && history3.length > 0) {
       let sum = 0;
       for (let i = 0; i < history3.length; i++) {
@@ -20,7 +20,7 @@
     }
   };
 
-  handlePressureValue = (pressure) => {
+  const handlePressureValue = (pressure) => {
     if (pressure == undefined || pressure <= 0) {
       return;
     }
@@ -50,7 +50,7 @@
     calculcate3hAveragePressure();
   };
 
-  barometerPressureHandler = (e) => {
+  const barometerPressureHandler = (e) => {
     const MEDIANLENGTH = 20;
     while (currentPressures.length > MEDIANLENGTH)
       currentPressures.pop();
@@ -62,7 +62,7 @@
 
       if (median.length > 10) {
         var mid = median.length >> 1;
-        medianPressure = Math.round(E.sum(median.slice(mid - 4, mid + 5)) / 9);
+        let medianPressure = Math.round(E.sum(median.slice(mid - 4, mid + 5)) / 9);
         if (medianPressure > 0) {
           turnOff();
           handlePressureValue(medianPressure);
@@ -78,13 +78,13 @@
   take the middle one (median)
   turn off barometer power
   */
-  getPressureValue = () => {
+  const getPressureValue = () => {
     Bangle.setBarometerPower(true, "zambretti");
     Bangle.on('pressure', barometerPressureHandler);
     setTimeout(turnOff, 30000);
   };
 
-  turnOff = () => {
+  const turnOff = () => {
     Bangle.removeListener('pressure', barometerPressureHandler);
     Bangle.setBarometerPower(false, "zambretti");
   };