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Add timing analysis, format output, limit execution cycles

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To increase the usefulness of the example, I added the measurement of
the complete cycle, which is the important figure. The reading time
itself, though interesting, is not the limiting factor according to the
datasheet.
Additionally, I updated the printing instructions to create a nicely
formatted output and limited the number cycles necessary to reach "del
== 0".
This commit is contained in:
Harry93x 2015-11-14 21:50:01 +01:00
parent 34ff8cfd02
commit fad0391f62
1 changed files with 46 additions and 31 deletions
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77
libraries/DHTlib/examples/dht_tuning/dht_tuning.ino
View File

@ -12,67 +12,82 @@
dht DHT; dht DHT;
#define DHT22_PIN 5 #define DHT22_PIN 2
void setup() void setup()
{ {
Serial.begin(115200); Serial.begin(115200);
Serial.println("DHT TEST PROGRAM "); Serial.println("DHT TEST PROGRAM ");
Serial.print("LIBRARY VERSION: "); Serial.print("LIBRARY VERSION: ");
Serial.println(DHT_LIB_VERSION); Serial.println(DHT_LIB_VERSION);
Serial.println(); Serial.println();
Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)\tTime (us)"); Serial.println("Type,\tstatus,\t\tHumidity (%),\tTemperatur (C),\tT_Read (us)\tT_Cycle (us)\tT_Delay (us)");
} }
int del = 500; int del = 500;
uint32_t startRead = 0;
uint32_t stopRead = 0;
uint32_t startCycle = 0;
uint32_t stopCycle = 0;
uint32_t tempCycle = 0;
void loop() void loop()
{ {
while(del > 0){
// READ DATA // READ DATA
Serial.print("DHT22, \t"); Serial.print("DHT22, \t");
uint32_t start = micros(); startRead = micros();
int chk = DHT.read22(DHT22_PIN); int chk = DHT.read22(DHT22_PIN);
uint32_t stop = micros(); stopRead = micros();
switch (chk) switch (chk)
{ {
case DHTLIB_OK: case DHTLIB_OK:
Serial.print("OK,\t"); Serial.print("OK,\t\t");
del -= 10; del -= 10;
break; break;
case DHTLIB_ERROR_CHECKSUM: case DHTLIB_ERROR_CHECKSUM:
Serial.print("Checksum error,\t"); Serial.print("Checksum,\t");
break; break;
case DHTLIB_ERROR_TIMEOUT: case DHTLIB_ERROR_TIMEOUT:
Serial.print("Time out error,\t"); Serial.print("Time out,\t");
del += 10; del += 10;
break; break;
case DHTLIB_ERROR_CONNECT: case DHTLIB_ERROR_CONNECT:
Serial.print("Connect error,\t"); Serial.print("Connect,\t");
break; break;
case DHTLIB_ERROR_ACK_L: case DHTLIB_ERROR_ACK_L:
Serial.print("Ack Low error,\t"); Serial.print("Ack Low,\t");
break; break;
case DHTLIB_ERROR_ACK_H: case DHTLIB_ERROR_ACK_H:
Serial.print("Ack High error,\t"); Serial.print("Ack High,\t");
break; break;
default: default:
Serial.print("Unknown error,\t"); Serial.print("Unknown,\t");
break; break;
} }
// DISPLAY DATA // DISPLAY DATA
Serial.print(DHT.humidity, 1); Serial.print(DHT.humidity, 1);
Serial.print(",\t"); Serial.print(",\t\t");
Serial.print(DHT.temperature, 1); Serial.print(DHT.temperature, 1);
Serial.print(",\t"); Serial.print(",\t\t");
Serial.print(stop - start); Serial.print(stopRead - startRead);
Serial.print(",\t"); Serial.print(",\t\t");
stopCycle = micros();
tempCycle = micros();
Serial.print(stopCycle - startCycle);
startCycle = tempCycle;
Serial.print(",\t\t");
Serial.print(del); Serial.print(del);
Serial.print("000");
Serial.println(); Serial.println();
delay(del); delay(del);
}
while(1);
} }
// //
// END OF FILE // END OF FILE
// //