Having my first results in hand I have to modify my software a bit. The DHT11 sometimes give strange measuring values (0°C, 6°C) and I want to change my measuring procedure. I will measure 3 values for temperature and humidity and I will take the middle values. The soil moisture measurement is quite unstable so I will take the average of three measurements.
Additionally I have cleaned up the code structure.
I had troubles with two issues:
- My measurement values are stored in arrays of struct. I learned that the typedef must be done in a header.
- The ESP8266 does not support the std library. So I use a macro for the min function
That’s the result:
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// Struct for measuring values typedef struct { float temp; float hum; float soil; } value_type; |
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#include #include "Logger.h" // min macro for ESP #define espmin(X, Y) (((X)<(Y))?(X):(Y)) // WiFi connection const char* ssid = "SSID"; const char* password = "PASSWORD"; char server[] = "SERVERIP"; int port = 80; WiFiClient client; const unsigned long postingInterval = 1800L * 1000000L; // delay between updates, in microseconds //DHT #include #define DHTPIN 4 #define DHTTYPE DHT11 // DHT 11 DHT dht(DHTPIN, DHTTYPE,16); // needed to avoid link error on ram check extern "C" { #include "user_interface.h" } void setup() { value_type values[3]; // start serial pinMode(12, OUTPUT); pinMode(A0, INPUT); dht.begin(); Serial.begin(115200); Serial.println("WLAN Greenhouse Data Logger - Electric Playground"); // First measuring values[0]= domeasuring(); delay(1000); // Second measuring values[1]= domeasuring(); delay(1000); // Third measuring values[2]= domeasuring(); // Finding the middle value float temp; float hum; float minmin = espmin(espmin(values[0].temp, values[1].temp), values[2].temp); if (values[0].temp = minmin) { temp=espmin(values[1].temp, values[2].temp); hum=espmin(values[1].hum, values[2].hum); } else if (values[1].temp = minmin) { temp=espmin(values[0].temp, values[2].temp); hum=espmin(values[0].hum, values[2].hum); } else { temp=espmin(values[0].temp, values[1].temp); hum=espmin(values[0].hum, values[1].hum); } float soil=(values[0].soil+values[1].soil+values[1].soil)/3.0; // send data // Connect to WIFI WiFi.mode(WIFI_STA); WiFiStart(); // debug while (client.available()) { char c = client.read(); Serial.write(c); } Serial.println("Humidity:"+String(hum,2)+"\tTemperature:"+String(temp,2)+"\tSoil:"+String(soil,2)); httpRequest(hum,temp,soil); Serial.println("Good Night"); ESP.deepSleep(postingInterval, WAKE_NO_RFCAL); //WAKE_DEFAULT, WAKE_RFCAL, WAKE_NO_RFCAL, WAKE_RF_DISABLED. delay(1000); } void loop() { // do nothing } // Measueing value_type domeasuring() { digitalWrite(12, HIGH); delay(300); value_type retval; retval.hum = dht.readHumidity(); if (isnan(retval.hum)) retval.hum=999; retval.temp = dht.readTemperature(); if (isnan(retval.temp)) retval.temp=999; retval.soil = analogRead(A0); digitalWrite(12, LOW); Serial.println("Humidity:"+String(retval.hum,2)+"\tTemperature:"+String(retval.temp,2)+"\tSoil:"+String(retval.soil,2)); return retval; } void httpRequest(float h, float t, float s) { // close any connection before send a new request. // This will free the socket on the WiFi shield client.stop(); delay(100); // We now create a URI for the request String url = "/newrecord.php?"; url += "temp="; url += String(t,2); url += "&humidity="; url += String(h,2); url += "&soil="; url += String(s,2); // if there's a successful connection: if (client.connect(server, port)) { Serial.println("connecting..."); client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + server + "\r\n" + "Connection: close\r\n\r\n"); Serial.println("data submitted."); delay(10); } else { // if you couldn't make a connection: Serial.println("connection failed"); } } void WiFiStart() { // Connect to WiFi network Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(250); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); // Print the IP address Serial.println(WiFi.localIP()); } |
