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Implement absolute humidity calculation

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bzi 2019-02-28 21:27:49 +01:00
parent 3ab22b2e94
commit 31bf631365
1 changed files with 9 additions and 2 deletions
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11
envisens/envisens_esp_fw/envisens_esp_fw.ino
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@ -18,14 +18,18 @@
#define TOPIC_HMID TOPIC_BASE "humidity"
#define TOPIC_HEAT TOPIC_BASE "heat_index"
#define TOPIC_AIRQ TOPIC_BASE "air_gas"
#define TOPIC_ABHU TOPIC_BASE "abs_humidity"
#define DIFF_TEMP 0.3 // sensor has only 0.5°C accuracy, triggering on less is ludicrous
#define DIFF_HMID 2.5 // humidity doesn't change that much anyways
#define DIFF_HEAT 0.2 // this one's actually quite active
#define DIFF_AIRQ 3 // this one hardly changes
#define DIFF_ABHU 0.1 // small changes mean quite something
float hmid = 0; // humidity
float hmid_r = 0; // humidity
float abhu = 0; // absolute humidity
float abhu_r = 0; // absolute humidity
float temp = 0; // temperature
float temp_r = 0; // temperature
float heat = 0; // heat index
@ -122,8 +126,6 @@ bool publish (String desc, char *topic, float val, float &lastVal, float diff, b
Serial.print("** ERROR: Value out of bounds, not published. Last value :");
Serial.println(String(lastVal).c_str());
}
} else {
Serial.println("Not enough variation for a publication");
}
return retval;
}
@ -181,6 +183,10 @@ void loop() {
Serial.println("ERR: Sensor could not be identified");
}
if (!isnan(hmid) && !isnan(temp)){
abhu = (6.112 * ( pow(2.71828, ((17.67 * temp) / (temp + 243.5))) * hmid * 2.1674)) / (273.15 + temp);
}
published = false;
if (lastSent > FORCE_PERIOD) {
Serial.println(F("Forcing a publish of all values"));
@ -192,6 +198,7 @@ void loop() {
published += publish("humidity", TOPIC_HMID, hmid, hmid_r, DIFF_HMID, forcePublish);
published += publish("heat index", TOPIC_HEAT, heat, heat_r, DIFF_HEAT, forcePublish);
published += publish("air quality", TOPIC_AIRQ, airq, airq_r, DIFF_AIRQ, forcePublish);
published += publish("absolute humidity", TOPIC_ABHU, abhu, abhu_r, DIFF_ABHU, forcePublish);
if (published == false) {
lastSent = lastSent + 1;