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check for DHT value validity

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This commit is contained in:
Ronald Schaten 2016-03-21 09:52:50 +01:00
parent 602077a726
commit 8fcc840a20
1 changed files with 7 additions and 0 deletions
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7
things.ino
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@ -55,6 +55,7 @@ Ticker ticker; // LED status
WiFiClient wifiClient; WiFiClient wifiClient;
PubSubClient mqtt_client(wifiClient); PubSubClient mqtt_client(wifiClient);
bool dhtvalid = false; // indicate if measurement is valid
float humidity, temperature; // raw values from the sensor float humidity, temperature; // raw values from the sensor
float heatindex; // computed value from the sensor float heatindex; // computed value from the sensor
char str_humidity[10], str_temperature[10]; // rounded values as strings char str_humidity[10], str_temperature[10]; // rounded values as strings
@ -108,8 +109,14 @@ void read_sensor() {
// check if any reads failed and exit early (to try again) // check if any reads failed and exit early (to try again)
if (isnan(humidity) || isnan(temperature)) { if (isnan(humidity) || isnan(temperature)) {
dhtvalid = false;
Serial.println("Failed to read from DHT sensor!"); Serial.println("Failed to read from DHT sensor!");
strcpy(str_humidity, "invalid");
strcpy(str_temperature, "invalid");
strcpy(str_heatindex, "invalid");
return; return;
} else {
dhtvalid = true;
} }
// convert the floats to strings and round to 2 decimal places // convert the floats to strings and round to 2 decimal places