v2.9

lib/DallasTemperature/examples/Timing/Timing.ino

@@ -0,0 +1,77 @@
+//
+//    FILE: Timing.ino
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.0.3
+// PURPOSE: show performance of DallasTemperature lib
+//          compared to datasheet times per resolution
+//
+// HISTORY:
+// 0.0.1    2017-07-25 initial version
+// 0.0.2    2020-02-13 updates to work with current lib version
+// 0.0.3    2020-02-20 added timing measurement of setResolution
+
+#include <OneWire.h>
+#include <DallasTemperature.h>
+
+#define ONE_WIRE_BUS 2
+
+OneWire oneWire(ONE_WIRE_BUS);
+DallasTemperature sensor(&oneWire);
+
+uint32_t start, stop;
+
+
+void setup()
+{
+  Serial.begin(9600);
+  Serial.println(__FILE__);
+  Serial.print("DallasTemperature Library version: ");
+  Serial.println(DALLASTEMPLIBVERSION);
+
+  sensor.begin();
+}
+
+void loop()
+{
+  float ti[4] = { 94, 188, 375, 750 };
+
+  Serial.println();
+  Serial.println("Test takes about 30 seconds for 4 resolutions");
+  Serial.println("RES\tTIME\tACTUAL\tGAIN");
+  for (int r = 9; r < 13; r++)
+  {
+    start = micros();
+    sensor.setResolution(r);
+    Serial.println(micros() - start);
+
+    start = micros();
+    sensor.setResolution(r);
+    Serial.println(micros() - start);
+
+    uint32_t duration = run(20);
+    float avgDuration = duration / 20.0;
+
+    Serial.print(r);
+    Serial.print("\t");
+    Serial.print(ti[r - 9]);
+    Serial.print("\t");
+    Serial.print(avgDuration, 2);
+    Serial.print("\t");
+    Serial.print(avgDuration * 100 / ti[r - 9], 1);
+    Serial.println("%");
+  }
+  delay(1000);
+}
+
+uint32_t run(int runs)
+{
+  float t;
+  start = millis();
+  for (int i = 0; i < runs; i++)
+  {
+    sensor.requestTemperatures();
+    t = sensor.getTempCByIndex(0);
+  }
+  stop = millis();
+  return stop - start;
+}