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--- cs:hw:05-sensors:iaq [2021/08/04 07:29]
avsetula [Kam dál?]
+++ cs:hw:05-sensors:iaq [2021/08/04 08:01]
avsetula
@@ Line 114: / Line 114: @@
+===== Kód dekodéru rámce LoRa =====
+Příklad binárního dekodéru části přenášených dat (payload). Názvy funkcí jsou v souladu se sítí ''The Things Network''.
+<code>
+function getBit(number, bitPosition) {
+  return (number & (1 << bitPosition)) === 0 ? 0 : 1;
+}
+function Decoder(bytes, port) {
+  // Decode an uplink message from a buffer
+  // (array) of bytes to an object of fields.
+  var decoded = {};
+  if (getBit(bytes[0],0)) {
+    decoded.temperature = ((bytes[2] << 8) | bytes[1]) / 100 - 100;
+    decoded.relative_humidity = bytes[3] / 2.5;
+  }
+  if (getBit(bytes[0],1)) decoded.pressure = ((bytes[5] << 8) | bytes[4]) / 100 + 800;
+  if (getBit(bytes[0],2)) {
+    decoded.voc_index = ((bytes[7] << 8) | bytes[6]) & 0x01FF;
+    decoded.voc_accuracy = ((bytes[7] << 8) | bytes[6]) >> 9 & 0x0003;
+  }
+  if (getBit(bytes[0],3)) decoded.ambient_light = Math.exp(bytes[8] / 20) - 1;
+  if (getBit(bytes[0],4)) decoded.co2 = ((bytes[10] << 8) | bytes[9]);
+  if (getBit(bytes[0],5)) {
+    decoded.pm10 = (((bytes[13] << 16) | (bytes[12] << 8) | bytes[11]) >> 12) & 0x000FFF / 4;
+    decoded.pm2_5 = ((bytes[13] << 16) | (bytes[12] << 8) | bytes[11]) & 0x000FFF / 4;
+  }
+  if (getBit(bytes[0],6)) {
+    decoded.noise_duration = (bytes[14] / 2);
+    decoded.noise_intensity = (bytes[15] / 5) + 25;
+  }
+  return decoded;
+}
+</code>
 ===== Kam dál? =====
-  * [[cs:files:products:05-sensors| Dokumentace a firmware ke stažení]]
-  * [[https://www.unipi.technology/cs/interierovy-senzor-kvality-vzduchu-p299?categoryId=43| Koupit na e-shopu Unipi]]
+<tile>
+| cs:files:products:05-sensors:iaq            | Dokumentace a firmware ke stažení  | :en:files:unipi-kb-icon-os.png         |
+| cs:hw:05-sensors:iaq-eshop-redirect-hidden  | Koupit na e-shopu Unipi            | :en:files:unipi-kb-icon-shop.png       |
+</tile>