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