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2017-04-25 at 1:36 AM
#2172
Hello,
Thanks for the quick response.Bellow is the sketch running on the arduino Uno R3. The devices where actually tested on the field(not in a controlled environment).The results shown on the plot
Thanks for the quick response.Bellow is the sketch running on the arduino Uno R3. The devices where actually tested on the field(not in a controlled environment).The results shown on the plot
Hello,
Thanks for the quick response.Bellow is the sketch running on the arduino Uno R3. The devices where actually tested on the field(not in a controlled environment).The results shown on the plot is VMC collected every minute from the sensors. Actually the VWC is expected to reduce with time, these results are collected over a period of 3 days. Surprisingly they show a sinusoidal curve and the sensors are places in a sandy loam soil. I am thinking maybe the sketch has some problem. Please do you have any ideas why such results?
Thanks for the quick response.Bellow is the sketch running on the arduino Uno R3. The devices where actually tested on the field(not in a controlled environment).The results shown on the plot is VMC collected every minute from the sensors. Actually the VWC is expected to reduce with time, these results are collected over a period of 3 days. Surprisingly they show a sinusoidal curve and the sensors are places in a sandy loam soil. I am thinking maybe the sketch has some problem. Please do you have any ideas why such results?
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//This is the first code for taking data from the 5TM sensor and showing it on the Arduino serial mornitor #include <SDI12.h> #define DATAPIN 7 // change to the proper pin for sdi-12 data pin, I prefer D7 SDI12 mySDI12(DATAPIN); unsigned long previousMillis = 0; const long interval = 60000; //set the interval (in milliseconds). ex: 60000 = 60 seconds void setup () { pinMode(13, OUTPUT); digitalWrite(13, LOW); //turn off the onboard LED to start with Serial.begin(57600); mySDI12.begin(); Serial.println("Sketch for sampling multiple SDI12 sensors"); delay(1000); } void loop () { unsigned long currentMillis = millis(); if(currentMillis - previousMillis >= interval || previousMillis == 0) { previousMillis = currentMillis; digitalWrite(13, HIGH); //turn on the onboard LED to show that samples are being taken Serial.print("Time: "); Serial.print(currentMillis/1000); //print out the current time, in seconds Serial.print(" ---- "); for (char j = '1'; j <= '2'; j++) { //go through channels 1 to 6 tmMeasurement(j); } Serial.println(); digitalWrite(13, LOW); //turn off the LED to show that samples are done } delay(1000); } void tmMeasurement(char c){ //5TM soil moisture sensor String command = ""; float Ea = 0.0; float temp = 0.0; float VWC = 0.0; command += c; command += "M!"; // SDI-12 measurement command format [address]['M'][!] mySDI12.sendCommand(command); delay(500); // wait a sec mySDI12.flush(); command = ""; command += c; command += "D0!"; // SDI-12 command to get data [address][D][dataOption][!] mySDI12.sendCommand(command); delay(500); if(mySDI12.available() > 0){ int channel = mySDI12.parseInt(); Ea = mySDI12.parseFloat(); temp = mySDI12.parseFloat(); VWC = (4.3e-6*(Ea*Ea*Ea)) - (5.5e-4*(Ea*Ea)) + (2.92e-2 * Ea) - 5.3e-2 ; //the TOPP equation used to calculate VWC Serial.print("Sensor:"); Serial.print(channel); Serial.print(": Ea="); Serial.print(Ea); //apparent dielectric permittivity Serial.print(", VWC="); Serial.print(VWC); //volumetric water content Serial.print("%, Temp="); Serial.print(temp); //Tempeerature Serial.print("degC .... "); } mySDI12.flush(); } |
