From 664b85ca0b3ee6bd2ee2e1a28864540ac4bdcbaf Mon Sep 17 00:00:00 2001
From: marwolaethblack <a.unal677@gmail.com>
Date: Mon, 27 Nov 2017 13:53:08 +0100
Subject: air quality index calculations

---
 web/js/realtime.js | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

(limited to 'web')

diff --git a/web/js/realtime.js b/web/js/realtime.js
index 4526e5e..f0158a2 100644
--- a/web/js/realtime.js
+++ b/web/js/realtime.js
@@ -1,3 +1,45 @@
+const table = {
+    Co: {
+        breakpoints: [0, 4.4, 4.5, 9.4, 9.5, 12.4, 12.5, 15.4, 15.5, 30.4, 30.5, 40.4, 40.5, 50.4],
+        aq: [0, 50, 51, 100, 101, 150, 151, 200, 201, 300, 301, 400, 401, 500]
+    },
+    So: {
+        breakpoints: [0.000, 0.034, 0.035, 0.144, 0.145, 0.224, 0.225, 0.304, 0.305, 0.604, 0.605, 0.804, 0.805, 1.004],
+        aq:[0, 50, 51, 100, 101, 150, 151, 200, 201, 300, 301, 400, 401, 500]
+    },
+    No: {
+        breakpoints: [0.65, 1.24, 1.25, 1.64, 1.65, 2.04],
+        aq:[201, 300, 301, 400, 401, 500]
+    }
+};
+
+
+var calculateAQI = function(gasName, concentration) {
+    var bpLow,bpHi;
+    var bpLowIndex, bpHiIndex;
+
+    table[gasName].breakpoints.forEach(function(value, index) {
+        if(value < concentration && table[gasName].breakpoints[index + 1] > concentration) {
+            bpLow = value;
+            bpLowIndex = index;
+        }
+
+        if(value > concentration && table[gasName].breakpoints[index - 1] < concentration) {
+            bpHi = value;
+            bpHiIndex = index;
+        }
+
+    });
+
+
+
+    var airQualityIndex = ((table[gasName].aq[bpHiIndex] - table[gasName].aq[bpLowIndex]) / (bpHi - bpLow)) * (concentration - bpLow) + table[gasName].aq[bpLowIndex];
+
+    return airQualityIndex;
+
+}
+
+
 function update() {
 
     var data;
@@ -14,6 +56,14 @@ function update() {
             table[2].textContent = data.No;
             table[3].textContent = data.So;
 
+            var indexes = [];
+            indexes.push(calculateAQI("Co", data.Co));
+            indexes.push(calcaulteAQI("No", data.No));
+            indexes.push(calculateAQI("So", data.So));
+
+            var max = Math.max(...indexes);
+            console.log(max);
+
         })
         .catch(function(error) {
             console.log(error);
@@ -25,3 +75,16 @@ function update() {
 }
 
 setInterval(update, 60000);
+
+
+
+
+
+
+
+
+
+
+
+
+
-- 
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